WO2022130717A1 - 試料支持体、イオン化法及び質量分析方法 - Google Patents
試料支持体、イオン化法及び質量分析方法 Download PDFInfo
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- WO2022130717A1 WO2022130717A1 PCT/JP2021/034404 JP2021034404W WO2022130717A1 WO 2022130717 A1 WO2022130717 A1 WO 2022130717A1 JP 2021034404 W JP2021034404 W JP 2021034404W WO 2022130717 A1 WO2022130717 A1 WO 2022130717A1
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- Prior art keywords
- region
- sample support
- partition
- sample
- partition groove
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Links
- 238000000752 ionisation method Methods 0.000 title claims description 25
- 238000004949 mass spectrometry Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title description 21
- 238000005192 partition Methods 0.000 claims abstract description 184
- 239000000758 substrate Substances 0.000 claims abstract description 84
- 239000010410 layer Substances 0.000 claims description 190
- 239000002344 surface layer Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000007743 anodising Methods 0.000 claims description 13
- 230000001678 irradiating effect Effects 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 description 10
- 230000007480 spreading Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000001878 scanning electron micrograph Methods 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000688 desorption electrospray ionisation Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000001871 ion mobility spectroscopy Methods 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000007736 thin film deposition technique Methods 0.000 description 1
- 238000001269 time-of-flight mass spectrometry Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0409—Sample holders or containers
- H01J49/0418—Sample holders or containers for laser desorption, e.g. matrix-assisted laser desorption/ionisation [MALDI] plates or surface enhanced laser desorption/ionisation [SELDI] plates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
- H01J49/161—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission using photoionisation, e.g. by laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/40—Time-of-flight spectrometers
Definitions
- the present disclosure relates to a sample support, an ionization method and a mass spectrometry method.
- Patent Document 1 describes a sample target including an aluminum layer and a porous alumina layer provided on the aluminum layer.
- the components of the sample are ionized by irradiating the layer of porous alumina on which the sample is arranged with a laser beam.
- a plurality of pores formed in the porous alumina layer are not opened on the aluminum layer side. Therefore, for example, in the case of ionizing a sample component with each of a plurality of regions as a measurement region in a layer of porous alumina, if a sample containing a liquid is placed in one region, the sample cannot fit in the plurality of pores. May flow out of one area and spread to another area.
- the present disclosure describes a sample support that can prevent the sample from spreading from one region to another when the components of the sample are ionized in each of the plurality of regions, and such a sample support. It is an object of the present invention to provide an ionization method and a mass spectrometry method using a body.
- the sample support on one aspect of the present disclosure is a sample support used for ionizing a component of a sample, which is a substrate, a porous layer provided on the substrate and having a surface opposite to the substrate, and a surface.
- the porous layer includes a main body layer having a plurality of holes opened on the surface, and the partition portion is between the first region and the second region. Includes a partition groove formed on the surface to pass through.
- a partition groove formed on the surface of the porous layer so that a partition portion for partitioning the surface of the porous layer into a first region and a second region passes between the first region and the second region. Includes.
- the width of the partition groove may be larger than the depth of the partition groove. According to this, it is possible to more reliably prevent the sample from spreading from the first region to the second region.
- the depth of the partition groove may be 50 ⁇ m or more and 300 ⁇ m or less, and the width of the partition groove may be twice or more the depth of the partition groove. According to this, it is possible to more reliably prevent the sample from spreading from the first region to the second region.
- the partition portion is a part of the annular first partition groove surrounding the first region, a part of the annular second partition groove surrounding the second region, and a part of the annular second partition groove as a partition groove.
- a part of the third partition groove passing between the first partition groove and the second partition groove may be included. According to this, it is possible to more reliably prevent the sample from spreading from the first region to the second region.
- the partition groove extends in an annular shape, the first region is a region outside the partition groove, and the second region is a region inside the partition groove. You may.
- the first region can be used for ionization of the components of the sample, and the second region can be used for mass calibration.
- the partition groove by recognizing the partition groove, it is possible to easily recognize the existence range of the reagent used for mass calibration, and it is possible to accurately irradiate the existence range of the reagent, for example, with energy rays. Become.
- the sample support on one aspect of the present disclosure further comprises a display unit for displaying predetermined information, and the display unit may include a display groove formed on the surface.
- the display portion can be formed by the same method as the partition groove, and the sample support can be manufactured with high efficiency.
- the main body layer is an insulating layer
- the porous layer may further include a conductive layer extending at least along the surface. According to this, by irradiating the surface of the porous layer, that is, the conductive layer with energy rays, the components of the sample can be ionized with high efficiency.
- the main body layer is an insulating layer, and the main body layer may be exposed to the outside at least on the surface. According to this, by irradiating the surface of the porous layer, that is, the main body layer which is the insulating layer, the charged minute droplets can ionize the components of the sample with high efficiency.
- the substrate and the main body layer may be formed by anodizing the surface layer of the metal substrate or the silicon substrate. According to this, it is possible to reliably and easily obtain a structure capable of ionizing the components of the sample with high efficiency.
- the partition groove may be formed on the surface of the substrate by dropping the porous layer into the groove formed on the surface of the substrate on the porous layer side.
- a porous layer including a partition groove can be formed by forming a groove on the surface layer of a metal substrate or a silicon substrate and then anodizing the surface layer of the metal substrate or the silicon substrate. Therefore, for example, as compared with the case where the porous layer is formed by anodizing the surface layer of the metal substrate or the silicon substrate and then the partition groove is formed on the surface of the porous layer, the porous layer is formed at the time of forming the partition groove. Can be prevented from being damaged.
- the ionization method of one aspect of the present disclosure is a step of preparing the sample support in which the porous layer contains a conductive layer, a step of arranging the sample on the surface, and a step of irradiating the surface with energy rays to ionize the components. It is equipped with a process.
- the components of the sample can be ionized with high efficiency.
- the ionization method of one aspect of the present disclosure includes a step of preparing the sample support in which the main body layer, which is an insulating layer, is exposed to the outside in the porous layer, a step of arranging the sample on the surface, and a charged microliquid. It comprises a step of ionizing a component by irradiating the surface with a drop.
- the components of the sample can be ionized with high efficiency.
- the mass spectrometric method of one aspect of the present disclosure includes a plurality of steps included in the above ionization method and a step of detecting an ionized component.
- a sample support capable of preventing the sample from spreading from one region to another when ionizing the components of the sample in each of the plurality of regions, as well as such a sample support. It is possible to provide an ionization method and a mass spectrometry method using a body.
- FIG. 1 is a plan view of the sample support of the first embodiment.
- FIG. 2 is a cross-sectional view of the sample support along line II-II shown in FIG.
- FIG. 3 is a cross-sectional view of the porous layer shown in FIG.
- FIG. 4 is a diagram showing a manufacturing process of the sample support shown in FIG.
- FIG. 5 is a diagram showing a process of forming the main body layer shown in FIG.
- FIG. 6 is a diagram showing an SEM image of the surface of the main body layer as an example.
- FIG. 7 is a diagram showing an SEM image of a cross section of a porous layer as an example.
- FIG. 8 is a diagram showing an ionization method and a mass spectrometry method using the sample support shown in FIG. FIG.
- FIG. 9 is a plan view of the sample support of the second embodiment.
- FIG. 10 is a diagram showing an ionization method and a mass fractionation method using the sample support shown in FIG.
- FIG. 11 is a diagram showing a manufacturing process of a sample support of a modified example.
- the sample support 1A of the first embodiment includes a substrate 2 and a porous layer 3.
- the sample support 1A is used for ionizing the components of the sample.
- the thickness direction of the substrate 2 is referred to as a Z-axis direction
- one direction perpendicular to the Z-axis direction is referred to as an X-axis direction
- a direction perpendicular to both the Z-axis direction and the X-axis direction is referred to as a Y-axis direction.
- the substrate 2 has a front surface 2a and a back surface 2b perpendicular to the Z-axis direction.
- the shape of the substrate 2 is, for example, a rectangular plate having the X-axis direction as the length direction.
- the thickness of the substrate 2 is, for example, about 0.5 to 1 mm.
- the material of the substrate 2 is, for example, Al (aluminum).
- the porous layer 3 is provided on the substrate 2. Specifically, the porous layer 3 is formed on the entire surface 2a of the substrate 2. The porous layer 3 has a surface 3a on the opposite side of the substrate 2.
- the porous layer 3 includes a main body layer 31 which is an insulating layer.
- the material of the main body layer 31 is, for example, Al 2 O 3 (alumina).
- the main body layer 31 has a plurality of holes 33 that open in the surface 3a.
- Each hole 33 includes an extending portion 34 and an opening 35.
- the extending portion 34 extends in the Z-axis direction.
- the shape of the extending portion 34 when viewed from the Z-axis direction is, for example, a circular shape.
- the opening 35 is widened from the end 34a on the surface 3a side of the extending portion 34 toward the surface 3a.
- the shape of the opening 35 is, for example, a bowl shape or a conical trapezoidal shape (tapered shape) extending from the end 34a of the extending portion 34 toward the surface 3a.
- the end of the extending portion 34 on the substrate 2 side is located in the main body layer 31.
- the porous layer 3 further contains a conductive layer 32.
- the conductive layer 32 is formed at least along the surface 3a of the porous layer 3 and the inner surface 35a of each opening 35.
- the material of the conductive layer 32 is a metal having low affinity (reactivity) with the sample and high conductivity. Examples of such a metal include Au (gold), Pt (platinum), Cr (chromium), Ni (nickel), and Ti (titanium).
- both ends 1a of the sample support 1A in the X-axis direction are, for example, when the sample support 1A is attached to a mass spectrometer. Functions as a held part.
- the region between both ends 1a of the surface 3a of the porous layer 3 functions as a measurement region.
- the region has, for example, a rectangular shape with the X-axis direction as the length direction.
- the sample support 1A further includes a partition portion 4 and a display portion 5.
- the partition portion 4 partitions the region between both end portions 1a of the surface 3a of the porous layer 3 into a plurality of regions A.
- the partition portion 4 includes a plurality of partition grooves 41 extending in an annular shape (for example, an annular shape) and a plurality of partition grooves 42 extending linearly.
- the plurality of partition grooves 41 are arranged in a matrix, for example.
- Each partition groove 41 defines a region A.
- Each partition groove 41 is formed on the surface 3a of the porous layer 3 so as to pass between adjacent regions A.
- the plurality of partition grooves 42 include a plurality of first portions extending along the X-axis direction and a plurality of second portions extending along the Y-axis direction.
- the first portion of the partition groove 42 reaches both end portions 1a.
- the second portion of the partition groove 42 reaches both ends of the porous layer 3 in the Y-axis direction.
- Each first part and each second part intersect each other and are connected to each other. That is, the plurality of partition grooves 42 extend in a grid pattern.
- Each partition groove 42 is formed on the surface 3a of the porous layer 3 so as to pass between adjacent partition grooves 41.
- the partition portion 4 will be described by focusing on adjacent regions A (a pair of regions A).
- one region A is designated as the first region A1 and the other region A is designated as the second region A2.
- the partition portion 4 includes a first partition groove 4a (partition groove 41), a second partition groove 4b (partition groove 41), and a third partition groove 4c (partition groove 42).
- the first partition groove 4a surrounds the first region A1.
- the second partition groove 4b surrounds the second region A2.
- the third partition groove 4c passes between the first partition groove 4a and the second partition groove 4b.
- first partition groove 4a, the second partition groove 4b, and the third partition groove 4c pass between the first region A1 and the second region A2.
- the first region A1 and the second region A2 are partitioned by a first partition groove 4a, a second partition groove 4b, and a third partition groove 4c.
- the first region A1 and the second region A2 may be any pair of regions A adjacent to each other in the X-axis direction, or any pair of regions A adjacent to each other in the Y-axis direction.
- the partition groove 41 is formed on the surface 3a of the porous layer 3 by the porous layer 3 falling into the groove 2c formed on the surface 2a of the substrate 2.
- the porous layer 3 is continuously formed over the entire surface (inner surface of the surface 2a and the groove 2c) on the substrate 2 opposite to the back surface 2b.
- the thicknesses of the porous layer 3 formed on the surface 2a of the substrate 2 and the porous layer 3 formed in the groove 2c are substantially the same.
- the partition groove 41 is formed by the surface 3a of the porous layer 3 formed on the inner surface of the groove 2c.
- the width of the partition groove 41 is larger than the depth of the partition groove 41.
- the depth of the partition groove 41 is 50 ⁇ m or more and 300 ⁇ m or less. In the present embodiment, the depth of the partition groove 41 is about 50 ⁇ m.
- the width of the partition groove 41 is at least twice the depth of the partition groove 41.
- the partition groove 41 can be recognized by the visual recognition of the operator. That is, the partition groove 41 has not only a function as a partition portion for partitioning between adjacent regions A but also a function as a marking for recognizing each region A.
- the partition groove 42 is formed on the surface 3a of the porous layer 3 by the porous layer 3 falling into the groove 2c formed on the surface 2a of the substrate 2.
- the width of the partition groove 42 is larger than the depth of the partition groove 42.
- the depth of the partition groove 42 is 50 ⁇ m or more and 300 ⁇ m or less. In the present embodiment, the depth of the partition groove 42 is, for example, about 50 ⁇ m.
- the width of the partition groove 42 is at least twice the depth of the partition groove 42.
- the partition groove 42 can be recognized by the visual recognition of the operator. That is, the partition groove 42 has not only a function as a partition portion for partitioning between adjacent regions A but also a function as a marking for recognizing each region A.
- the depths of the partition grooves 41 and 42 are values obtained by using a confocal laser scanning microscope.
- the widths of the partition grooves 41 and 42 are values obtained from an image taken by a microscope.
- the display unit 5 includes a plurality of first display grooves 51 and a plurality of second display grooves 52.
- the plurality of first display grooves 51 are arranged along the X-axis direction.
- the plurality of first display grooves 51 are arranged on one side in the Y-axis direction with respect to the entire plurality of regions A.
- Each first display groove 51 corresponds to a plurality of rows of regions A arranged along the Y-axis direction.
- the first display groove 51 represents, for example, a number.
- the plurality of second display grooves 52 are lined up along the Y-axis direction.
- the plurality of second display grooves 52 are arranged on one side in the X-axis direction with respect to the entire plurality of regions A.
- Each second display groove 52 corresponds to a plurality of rows of regions A arranged along the X-axis direction.
- the second display groove 52 represents, for example, English characters.
- the first display groove 51 and the second display groove 52 are formed in a region between both ends 1a of the surface 3a of the porous layer 3 in a manner of displaying predetermined information.
- the porous layer 3 falls into the groove formed on the surface 2a of the substrate 2, so that the surface 3a of the porous layer 3a is formed. Is formed in.
- the predetermined information is information for identifying each of the plurality of regions A. For example, when arranging a sample in a predetermined region A, the predetermined region A can be specified by the combination of the first display groove 51 and the second display groove 52.
- the average value of the depths D of the plurality of holes 33 is 3 ⁇ m or more and 100 ⁇ m or less.
- the number of holes 33 having an average depth D of ⁇ 10% is 60% or more (preferably 70% or more, more preferably 80% or more) of the total number of holes 33. ..
- the average value of the width W of the plurality of holes 33 is 40 nm or more and 350 nm or less.
- the number of holes 33 having a width W having an average value of ⁇ 10% is 60% or more (preferably 70% or more, more preferably 80% or more) of the total number of holes 33.
- the value obtained by dividing the average value of the depth D by the average value of the width W is 9 or more and 2500 or less.
- the number of holes 33 having a “value obtained by dividing the average value of the depth D by the average value of the width W” having an average value of ⁇ 10% is 60% or more of the total number of holes 33 ( It is preferably 70% or more, more preferably 80% or more).
- the thickness T of the conductive layer 32 is 10 nm or more and 200 nm or less.
- the average value of the depth D is a value acquired as follows. First, the sample support 1A is prepared, and the sample support 1A is cut in parallel in the Z-axis direction. Subsequently, an SEM image of either one of the cut surfaces of the main body layer 31 is acquired. Subsequently, in the region corresponding to the region A, the average value of the depth D for the plurality of holes 33 is calculated, and the average value of the depth D is acquired.
- the average value of the width W is a value acquired as follows. First, the sample support 1A is prepared, and the sample support 1A (specifically, the main body layer 31) is cut perpendicularly in the Z-axis direction so as to cross the plurality of extending portions 34. Subsequently, an SEM image of either one of the cut surfaces of the main body layer 31 is acquired. Subsequently, in the region corresponding to the region A, a plurality of pixel groups corresponding to the plurality of holes 33 (specifically, the plurality of extending portions 34) are extracted. Extraction of this pixel group is performed, for example, by performing binarization processing on the SEM image.
- the diameter of the circle having the average value of the areas of the plurality of holes 33 (specifically, the plurality of extending portions 34) is calculated, and the diameter is the average of the width W. Get as a value.
- the substrate 2 and the main body layer 31 are formed by anodizing the surface layer of the metal substrate.
- the substrate 2 and the main body layer 31 are formed, for example, by anodizing the surface layer of the Al substrate.
- the metal substrate includes a Ta (tantalum) substrate, an Nb (niobium) substrate, a Ti (titanium) substrate, an Hf (hafnium) substrate, a Zr (zirconium) substrate, a Zn (zinc) substrate, and W ( Examples thereof include a (tungsten) substrate, a Bi (bismas) substrate, and an Sb (antimon) substrate.
- a plurality of holes 33 are uniformly formed (with a uniform distribution).
- the pitch (distance between the center lines) of the adjacent holes 33 is, for example, about 275 nm.
- the aperture ratio of the plurality of holes 33 in the region A (the ratio of the plurality of holes 33 to the region A when viewed from the Z-axis direction) is practically 10 to 80%, and particularly 60 to 80%. It is preferable to have.
- the widths W of the holes 33 may be irregular, or the holes 33 may be partially connected to each other.
- the substrate 2 is prepared, and a groove 2c for forming the partition portion 4 is formed on the surface 2a of the substrate 2.
- a groove for forming the display portion 5 shown in FIG. 1 is also formed on the surface 2a of the substrate 2.
- etching, laser processing, machining, or the like is used to form the groove 2c for forming the partition portion 4 and the groove for forming the display portion 5.
- the main body layer 31 is formed on the surface 2a of the substrate 2.
- the conductive layer 32 is formed on the main body layer 31.
- a thin-film deposition method for example, a thin-film deposition method, a sputtering method, a plating method, an atomic layer deposition method (ALD: Atomic Layer Deposition), or the like is used.
- ALD Atomic Layer Deposition
- the sample support 1A is obtained.
- the porous layer 3 falls into the groove 2c for forming the partition portion 4, so that the plurality of partition grooves 41 and the plurality of partition grooves are formed on the surface 3a of the porous layer 3. 42 is formed. Further, as the porous layer 3 falls into the groove for forming the display unit 5, the plurality of first display grooves 51 and the plurality of second display grooves shown in FIG. 1 are formed on the surface 3a of the porous layer 3. 52 is formed.
- the substrate 2 is prepared, the surface layer of the substrate 2 is anodized, and the oxide layer 30 is formed on the surface 2a of the substrate 2.
- the oxide layer 30 has a plurality of holes 30a that open on the opposite side of the substrate 2.
- the oxide layer 30 is removed to expose the surface 2a of the substrate 2 to the outside.
- the surface 2a of the substrate 2 is formed with a plurality of bowl-shaped or conical trapezoidal (tapered) recesses.
- the plurality of recesses are formed at positions corresponding to the plurality of holes 30a.
- each hole 33 includes an opening 35 widened from the end 34a of the extending portion 34 toward the side opposite to the substrate 2.
- an opening 35 is formed in each hole 33.
- the regularity and uniformity of the arrangement and shape of the plurality of holes 33 are improved.
- the substrate 2 is an Al substrate, and the oxide layer 30 and the main body layer 31 are Al 2 O 3 layers.
- FIG. 6 is a diagram showing an SEM image of the surface of the main body layer 31 (the surface on the opening 35 side) as an example.
- the main body layer 31 shown in FIG. 6 is formed by performing anodizing of the surface layer of the Al substrate in two steps.
- the average value of the width W of the plurality of holes 33 black portion
- the average value of the depth D of the plurality of holes 33 is 10 ⁇ m
- the depth D is 1.
- the value obtained by dividing the average value by the average value of the width W is 91.
- FIG. 7 is a diagram showing an SEM image of a cross section (cross section parallel to the Z-axis direction) of the porous layer 3 as an example.
- the porous layer 3 shown in FIG. 7 is formed by carrying out vapor deposition of Pt on the surface of the main body layer 31 (the surface on the opening 35 side).
- Pt was vapor-deposited from a direction inclined by 30 degrees with respect to the direction perpendicular to the surface of the main body layer 31.
- the thickness T of the conductive layer 32 is 50 nm
- the amount of penetration of the conductive layer 32 (“the range in which the conductive layer 32 is formed” in the direction perpendicular to the surface of the main body layer 31”. Width) is 506 nm.
- each hole 33 since each hole 33 includes the opening 35, it is considered that a sufficient amount of penetration of the conductive layer 32 is secured with respect to the thickness T of the conductive layer 32.
- the sample support 1A is prepared (preparation step).
- the sample support 1A shown in FIG. 8 has a different number of regions A from the sample support 1A shown in FIG. 1, but has the same structure as that described with reference to FIGS. 1 to 7. It has a structure. Further, in FIG. 8, the partition groove 42 and the display unit 5 are not shown.
- the sample S is placed on the surface 3a of the porous layer 3 of the sample support 1A (step of placing).
- a sample S containing a liquid is dropped into each region A by a pipette 8.
- the component S1 of the sample S moves from the surface 3a side of the porous layer 3 to the substrate 2 side through the plurality of holes 33, and stays on the surface 3a side due to, for example, surface tension.
- the sample support 1A into which the component of the sample S is introduced is placed on the mounting surface 7a of the slide glass 7.
- the slide glass 7 is a glass substrate on which a transparent conductive film such as an ITO (Indium Tin Oxide) film is formed, and the mounting surface 7a is the surface of the transparent conductive film.
- the laser beam (energy ray) L is arranged on the surface 3a of the porous layer 3 of the sample support 1A by the sample S. Irradiate the area A.
- the component S1 of the sample S arranged on the surface 3a is ionized (the step of ionizing).
- the laser beam L is scanned against the component S1 of the sample S arranged on the surface 3a.
- the above steps correspond to the ionization method using the sample support 1A.
- An example of the above ionization method is carried out as a surface-assisted laser desorption / ionization method (SALDI).
- the sample ion (ionized component) S2 released by the ionization of the component S1 of the sample S is detected (detected step) by the mass spectrometer, and the mass spectrum of the molecule constituting the sample S is acquired.
- the mass spectrometer is a scanning mass spectrometer that uses a time-of-flight mass spectrometry method (TOF-MS). The above steps correspond to the mass spectrometry method using the sample support 1A.
- the partition portion 4 that partitions the surface 3a of the porous layer 3 into the first region A1 and the second region A2 passes between the first region A1 and the second region A2.
- the partition grooves 41 and 42 formed on the surface 3a of the porous layer 3 are included.
- the width of the partition grooves 41 and 42 is larger than the depth of the partition grooves 41 and 42. As a result, it is possible to more reliably prevent the sample S from spreading from the first region A1 to the second region A2.
- the partition grooves 41 and 42 can be recognized more reliably, and the existence range of the component S1 of the sample S can be recognized more reliably.
- the depth of the partition grooves 41 and 42 is 50 ⁇ m or more and 300 ⁇ m or less, and the width of the partition grooves 41 and 42 is more than twice the depth of the partition grooves 41 and 42.
- the partition grooves 41 and 42 can be recognized more reliably, and the existence range of the component S1 of the sample S can be recognized more reliably.
- the partition portion 4 has an annular first partition groove 4a surrounding the first region A1, an annular second partition groove 4b surrounding the second region A2, and a first partition groove 4a and a second partition groove. It includes a third partition groove 4c that passes between the 4b and the 4b. This makes it possible to more reliably prevent the sample S from spreading from the first region A1 to the second region A2.
- the sample support 1A includes a display unit 5 that displays predetermined information.
- the display unit 5 includes a first display groove 51 and a second display groove 52 formed on the surface 3a.
- the display unit 5 can be formed by the same method as the partition grooves 41 and 42, and the sample support 1A can be manufactured with high efficiency.
- the main body layer 31 is an insulating layer.
- the porous layer 3 includes a conductive layer 32 extending at least along the surface 3a. Thereby, by irradiating the surface 3a of the porous layer 3, that is, the conductive layer 32 with the laser beam L, the component S1 of the sample S can be ionized with high efficiency.
- the substrate 2 and the main body layer 31 are formed by anodizing the surface layer of the metal substrate. Thereby, a structure capable of ionizing the component S1 of the sample S with high efficiency can be surely and easily obtained.
- the partition grooves 41 and 42 are formed on the surface 3a by the porous layer 3 falling into the groove 2c formed on the surface 2a on the porous layer 3 side of the substrate 2.
- the porous layer 3 including the partition grooves 41 and 42 can be formed. Therefore, for example, as compared with the case where the porous layer is formed by anodizing the surface layer of the metal substrate and then the partition groove is formed on the surface of the porous layer, the porous layer is damaged when the partition groove is formed. Can be suppressed.
- the component S1 of the sample S can be ionized with high efficiency.
- the analysis of the component S1 of the sample S can be performed with high accuracy.
- the partition portion 4 includes only one partition groove 41, and the display unit 5 replaces the plurality of first display grooves 51 and the plurality of second display grooves 52. It differs from the above-mentioned sample support 1A in that it includes a plurality of third display grooves 53.
- the entire region between both ends 1a of the surface 3a of the porous layer 3 is the region A.
- the partition groove 41 is arranged, for example, at one corner of the region A.
- Each third display groove 53 is arranged, for example, in each of the three corners of the region A (three corners in which the partition groove 41 is not arranged).
- the partition groove 41 is formed on the surface 3a of the porous layer 3 so as to pass between the first region A1 and the second region A2.
- the first region A1 is a region of the region A outside the partition groove 41.
- the second region A2 is a region inside the partition groove 41 in the region A.
- the second region A2 is, for example, a region to which the reagent used for mass calibration is dropped.
- the partition portion 4 partitions the region A into a first region A1 and a second region A2.
- Each third display groove 53 extends in an X shape.
- the third display groove 53 is formed on the surface 3a of the porous layer 3 in a manner of displaying predetermined information. Similar to the partition groove 41, the third display groove 53 is formed on the surface 3a of the porous layer 3 by the porous layer 3 falling into the groove 2c formed on the surface 2a of the substrate 2.
- the predetermined information is information regarding the position and angle of the sample support 1B when the sample support 1B is attached to the mass spectrometer, for example, the sample support 1B is attached to the mass spectrometer. It is used for the alignment of the sample support 1B.
- the sample support 1B can be manufactured by the same manufacturing method as the sample support 1A.
- the sample support 1B is prepared (preparation step). Subsequently, the sample S is placed on the surface 3a of the porous layer 3 of the sample support 1B (step of arranging). As an example, the first region A1 of the surface 3a is pressed against the sample S to transfer the components of the sample S to the first region A1 of the surface 3a.
- the sample support 1B was attached to the mass spectrometer, and as shown in FIG. 10 (b), the components of the sample S arranged on the surface 3a as in the ionization method using the sample support 1A. Ionize S1 (step of ionizing). The above steps correspond to the ionization method using the sample support 1B. Subsequently, the sample ion (ionized component) S2 released by the ionization of the component S1 of the sample S is detected (detected step) by the mass spectrometer, and the two-dimensional distribution of the molecules constituting the sample S is imaged. Perform imaging mass spectrometry. The above steps correspond to the mass spectrometry method using the sample support 1B.
- the partition groove 41 extends in an annular shape.
- the first region A1 is a region outside the partition groove 41, and the second region A2 is a region inside the partition groove 41.
- the first region A1 can be used for ionization of the component S1 of the sample S
- the second region A2 can be used for mass calibration.
- the existing range of the reagent used for mass calibration can be easily recognized, and the existing range of the reagent can be accurately irradiated with, for example, the laser beam L. ..
- the partition portion 4 may partition the surface 3a of the porous layer 3 into at least two regions.
- the partition portion 4 may include, for example, only one partition groove that crosses the surface 3a of the porous layer 3. In that case, one side of the surface 3a with respect to the partition groove is the first region A1, and the other side of the surface 3a with respect to the partition groove is the second region A2.
- the partition portion 4 does not have to completely partition the entire surface 3a.
- the partition portion 4 is a part of the first partition groove 4a on the second partition groove 4b side, a part of the second partition groove 4b on the first partition groove 4a side, and the first partition groove. It may include only a part of the third partition groove 4c passing between the 4a and the second partition groove 4b.
- the partition portion 4 may include a partition groove that crosses only a part of the surface 3a of the porous layer 3. In that case, one side of the surface 3a with respect to the partition groove is the first region A1, and the other side of the surface 3a with respect to the partition groove is the second region A2.
- the partition portion 4 of the sample support 1A does not have to include at least one of the first portion and the second portion of the partition groove 42.
- the depth of the partition groove 41 is preferably 100 ⁇ m or more.
- the porous layer 3 does not have to include the conductive layer 32.
- the main body layer 31, which is an insulating layer may be exposed to the outside at least on the surface 3a of the porous layer 3 and the inner surface 35a of each opening 35.
- the component S1 of the sample S is ionized with high efficiency by irradiating the surface 3a of the porous layer 3, that is, the main body layer 31 which is an insulating layer, with charged-droplets. be able to.
- the ionization method and mass spectrometry method using the sample supports 1A and 1B in which the porous layer 3 does not include the conductive layer 32 are as follows. First, the sample supports 1A and 1B are prepared (preparation step). Subsequently, the sample S is placed (arranged) on the surface 3a of the porous layer 3 of the sample supports 1A and 1B (that is, the surface of the main body layer 31). Subsequently, in the mass spectrometer, the component S1 of the sample S is ionized (ionization step) by irradiating the surface 3a of the porous layer 3 of the sample supports 1A and 1B with the charged minute droplets.
- the charged minute droplets are scanned against the component S1 of the sample S arranged on the surface 3a.
- the above steps correspond to the ionization method using the sample supports 1A and 1B.
- An example of the above ionization method is carried out as a desorption electrospray ionization (DESI: Desorption Electrospray Ionization).
- the sample ion S2 released by the ionization of the component S1 of the sample S is detected by a mass spectrometer (step of detecting), and mass spectrometry of the molecules constituting the sample S is performed.
- the above steps correspond to the mass spectrometry method using the sample supports 1A and 1B.
- the average value of the depth D of the plurality of holes 33 is 3 ⁇ m or more and 100 ⁇ m or less, and the average value of the depth D is divided by the average value of the width W of the plurality of holes 33. If the value is 9 or more and 2500 or less, the average value of the width W does not have to be 40 nm or more and 350 nm or less. In that case, when the porous layer 3 includes the conductive layer 32, the thickness T of the conductive layer 32 does not have to be 10 nm or more and 200 nm or less.
- the conductive layer 32 may reach the inner surface of the extending portion 34 in each hole 33.
- the main body layer 31 may be a layer having conductivity (for example, a metal layer or the like). In that case, the conductive layer 32 can be omitted in the porous layer 3.
- the substrate 2 and the main body layer 31 may be formed by anodizing the surface layer of the Si (silicon) substrate.
- the porous layer 3 includes the conductive layer 32
- energy rays other than the laser beam L for example, an ion beam, an electron beam, etc.
- the surface 3a of the quality layer 3 may be irradiated.
- the partition portion 4 may be formed as follows. First, as shown in FIG. 11A, the substrate 2 is prepared, and the main body layer 31 is formed on the surface 2a of the substrate 2. Subsequently, as shown in FIG. 11B, a groove 2c leading to the substrate 2 is formed in the main body layer 31. Subsequently, as shown in FIG. 11 (c), the conductive layer 32 is formed on the main body layer 31. At this time, the conductive layer 32 is also formed on the inner surface of the groove 2c. From the above, the sample support 1A is obtained.
- the display unit 5 may also be formed in the same manner as the partition portion 4.
- the partition portion 4 and the display portion 5 of the sample support 1B may also be formed in the same manner as the partition portion 4 is formed.
- 1A, 1B ... sample support 2 ... substrate, 3 ... porous layer, 3a ... surface, 31 ... main body layer, 32 ... conductive layer, 33 ... hole, 4 ... partition part, 41, 42 ... partition groove, 4a ... 1st partition groove, 4b ... 2nd partition groove, 4c ... 3rd partition groove, 5 ... Display unit, 51 ... 1st display groove, 52 ... 2nd display groove, 53 ... 3rd display groove, A1 ... 1st area , A2 ... second region, L ... laser light (energy ray), S ... sample, S1 ... component, S2 ... sample ion (ionized component).
Abstract
Description
図1及び図2に示されるように、第1実施形態の試料支持体1Aは、基板2と、多孔質層3と、を備えている。試料支持体1Aは、試料の成分のイオン化に用いられるものである。以下、基板2の厚さ方向をZ軸方向といい、Z軸方向に垂直な一方向をX軸方向といい、Z軸方向及びX軸方向の両方向に垂直な方向をY軸方向という。
図9に示される試料支持体1Bは、仕切部4が1つの仕切溝41のみを含んでいる点、並びに、表示部5が複数の第1表示溝51及び複数の第2表示溝52に代えて複数の第3表示溝53を含んでいる点で、上述した試料支持体1Aと相違している。
本開示は、上述した実施形態に限定されない。例えば、仕切部4は、多孔質層3の表面3aを少なくとも2つの領域に仕切っていればよい。仕切部4は、例えば、多孔質層3の表面3aを横切る1つの仕切溝のみを含んでいてもよい。その場合には、当該仕切溝に対して表面3aの一方の側が第1領域A1であり、当該仕切溝に対して表面3aの他方の側が第2領域A2である。
Claims (13)
- 試料の成分のイオン化に用いられる試料支持体であって、
基板と、
前記基板上に設けられ、前記基板とは反対側の表面を有する多孔質層と、
前記表面を第1領域及び第2領域に仕切る仕切部と、を備え、
前記多孔質層は、前記表面に開口する複数の孔を有する本体層を含み、
前記仕切部は、前記第1領域と前記第2領域との間を通るように前記表面に形成された仕切溝を含む、試料支持体。 - 前記仕切溝の幅は、前記仕切溝の深さよりも大きい、請求項1に記載の試料支持体。
- 前記仕切溝の深さは、50μm以上300μm以下であり、
前記仕切溝の幅は、前記仕切溝の深さの2倍以上である、請求項2に記載の試料支持体。 - 前記仕切部は、前記仕切溝として、前記第1領域を囲む環状の第1仕切溝の一部、前記第2領域を囲む環状の第2仕切溝の一部、及び前記第1仕切溝と前記第2仕切溝との間を通る第3仕切溝の一部を含む、請求項1~3のいずれか一項に記載の試料支持体。
- 前記仕切溝は、環状に延在しており、
前記第1領域は、前記仕切溝の外側の領域であり、
前記第2領域は、前記仕切溝の内側の領域である、請求項1~3のいずれか一項に記載の試料支持体。 - 所定の情報を表示する表示部を更に備え、
前記表示部は、前記表面に形成された表示溝を含む、請求項1~5のいずれか一項に記載の試料支持体。 - 前記本体層は、絶縁層であり、
前記多孔質層は、少なくとも前記表面に沿って形成された導電層を更に含む、請求項1~6のいずれか一項に記載の試料支持体。 - 前記本体層は、絶縁層であり、
前記本体層は、少なくとも前記表面において外部に露出している、請求項1~6のいずれか一項に記載の試料支持体。 - 前記基板及び前記本体層は、金属基板又はシリコン基板の表層が陽極酸化されることで形成されている、請求項7又は8に記載の試料支持体。
- 前記仕切溝は、前記基板における前記多孔質層側の表面に形成された溝内に前記多孔質層が落ち込むことで、前記表面に形成されている、請求項1~9のいずれか一項に記載の試料支持体。
- 請求項7に記載の試料支持体を用意する工程と、
前記試料を前記表面に配置する工程と、
エネルギー線を前記表面に照射することで前記成分をイオン化する工程と、を備える、イオン化法。 - 請求項8に記載の試料支持体を用意する工程と、
前記試料を前記表面に配置する工程と、
帯電した微小液滴を前記表面に照射することで前記成分をイオン化する工程と、を備える、イオン化法。 - 請求項11又は12に記載のイオン化法が備える複数の工程と、
イオン化された前記成分を検出する工程と、を備える、質量分析方法。
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US20030116707A1 (en) * | 2001-08-17 | 2003-06-26 | Micromass Limited | Maldi sample plate |
JP2011210734A (ja) * | 2011-06-03 | 2011-10-20 | Hitachi High-Technologies Corp | イオン捕集装置 |
JP4885142B2 (ja) | 2005-10-20 | 2012-02-29 | 独立行政法人科学技術振興機構 | 質量分析法に用いられる試料ターゲットおよびその製造方法、並びに当該試料ターゲットを用いた質量分析装置 |
JP2016121968A (ja) * | 2014-12-25 | 2016-07-07 | シチズンファインデバイス株式会社 | 試料積載プレート |
JP2020136136A (ja) * | 2019-02-21 | 2020-08-31 | 株式会社豊田中央研究所 | レーザー脱離/イオン化質量分析用のサンプルプレート |
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Publication number | Priority date | Publication date | Assignee | Title |
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US20030116707A1 (en) * | 2001-08-17 | 2003-06-26 | Micromass Limited | Maldi sample plate |
JP4885142B2 (ja) | 2005-10-20 | 2012-02-29 | 独立行政法人科学技術振興機構 | 質量分析法に用いられる試料ターゲットおよびその製造方法、並びに当該試料ターゲットを用いた質量分析装置 |
JP2011210734A (ja) * | 2011-06-03 | 2011-10-20 | Hitachi High-Technologies Corp | イオン捕集装置 |
JP2016121968A (ja) * | 2014-12-25 | 2016-07-07 | シチズンファインデバイス株式会社 | 試料積載プレート |
JP2020136136A (ja) * | 2019-02-21 | 2020-08-31 | 株式会社豊田中央研究所 | レーザー脱離/イオン化質量分析用のサンプルプレート |
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