CN113451104B - Sample injection ionization source, forming method and working method thereof, and detection device - Google Patents
Sample injection ionization source, forming method and working method thereof, and detection device Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 81
- 239000007924 injection Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 61
- 230000005284 excitation Effects 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims description 53
- 150000002500 ions Chemical class 0.000 claims description 33
- 239000007789 gas Substances 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 150000001450 anions Chemical class 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 239000002041 carbon nanotube Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 10
- 229910021389 graphene Inorganic materials 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 150000008282 halocarbons Chemical class 0.000 claims description 4
- 230000036571 hydration Effects 0.000 claims description 4
- 238000006703 hydration reaction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000001871 ion mobility spectroscopy Methods 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000382 optic material Substances 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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
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- 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
- G01N27/622—Ion mobility spectrometry
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0027—Methods for using particle spectrometers
- H01J49/0031—Step by step routines describing the use of the apparatus
-
- 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
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
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- General Health & Medical Sciences (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention provides a sample injection ionization source, a forming method, a working method and a detection device thereof, wherein the sample injection ionization source comprises: the support net electrode and the counter electrode are oppositely arranged and spaced; one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode; sample introduction membrane layer, sample introduction membrane layer includes: the semi-permeable membrane layer is positioned on the surface of one side of the supporting net electrode, which is opposite to the counter electrode; the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode. The ionization efficiency of the sample injection ionization source is improved.
Description
Technical Field
The invention relates to the technical field of ionization, in particular to a sample injection ionization source, a forming method, a working method and a detection device thereof.
Background
In the existing detection device, such as ion mobility spectrometry, a semipermeable membrane is used for realizing sample injection of sample molecules, and the semipermeable membrane can realize transmission of volatile organic molecules while isolating ambient air. Sample molecules are injected through the semipermeable membrane and then are sent to the ion source for ionization of the sample molecules.
However, since the sample injection and ionization processes are discrete, sample molecules are transported from one side of the semipermeable membrane to the other side by diffusion, and then are diffused into the ion source from the other side of the semipermeable membrane, the concentration gradient distribution exists in the whole diffusion process, the concentration of the sample molecules reaching the ionization region due to diffusion can be reduced, and the ionization efficiency of the actual sample molecules is lower.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem of low ionization efficiency of the sample injection ionization source in the prior art, thereby providing the sample injection ionization source, the forming method, the working method and the detection device thereof.
The invention provides a sample injection ionization source, comprising: the support net electrode and the counter electrode are oppositely arranged and spaced; one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode; a sample injection film layer; the sample injection film layer comprises: the semi-permeable membrane layer is positioned on the surface of one side of the supporting net electrode, which is opposite to the counter electrode; the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode.
Optionally, the supporting net electrode is provided with a plurality of net gaps; the sample injection film layer further comprises: discrete photovoltaic material protrusions located on the surface of the semipermeable membrane layer and in the mesh; the channel between the support mesh electrode and the counter electrode is adapted to be vented with an electron withdrawing gas.
Optionally, the photoelectric material protrusion is a graphene protrusion or a carbon nanotube protrusion.
Optionally, the electron withdrawing gas includes any one or a combination of a halogenated hydrocarbon gas or oxygen.
Optionally, the thickness of the photoelectric material bulge is 1nm-5000nm.
Optionally, the excitation light source is an ultraviolet lamp light source, and the excitation light is ultraviolet light.
The invention also provides a working method of the sample injection ionization source, which comprises the following steps: the sample injection ionization source forms product positive ions in a positive ion mode; the process of forming product positive ions by the sample injection ionization source comprises the following steps: and after passing through the semipermeable membrane layer, the sample injection molecules form product positive ions under the irradiation of laser emitted by the excitation light source.
Optionally, the supporting net electrode is provided with a plurality of net gaps; the sample injection film layer further comprises: discrete photovoltaic material protrusions located on the surface of the semipermeable membrane layer and in the mesh; the channel between the supporting net electrode and the counter electrode is suitable for introducing electron-withdrawing gas; the sample injection ionization source forms product anions in an anion mode; the process of forming product anions by the sample injection ionization source comprises the following steps: the excitation light source emits excitation light to the photoelectric material bulge so that the photoelectric material bulge generates photo-generated electrons; the photo-generated electrons, water molecules positioned on the surface of the supporting net electrode and the electron withdrawing gas form hydration intermediate ions; and the hydrated intermediate ions and sample injection molecules passing through the semipermeable membrane layer form product anions.
The invention also provides a method for forming the sample injection ionization source, which comprises the following steps: providing a support net electrode, a counter electrode and a power supply; setting a sample injection film layer on the surface of the support net electrode, wherein the step of forming the sample injection film layer comprises the following steps: forming a semipermeable membrane layer on one side surface of the supporting net electrode; the supporting net electrode and the counter electrode are oppositely arranged and spaced, and the semipermeable membrane layer is positioned at one side of the supporting net electrode, which is away from the counter electrode; one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode; an excitation light source is arranged, and the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode.
Optionally, the supporting net electrode is provided with a plurality of net gaps; the step of forming the sample injection film layer further comprises the following steps: forming discrete photoelectric material bulges positioned in the network gaps on one side surface of the semi-permeable membrane layer; the method for forming the sample injection ionization source further comprises the following steps: an electron withdrawing gas source is provided and is adapted to pass electron withdrawing gas through the passageway between the support grid electrode and the counter electrode.
Optionally, the step of forming the bump of electro-optic material includes: providing a mixed dispersion comprising: volatile liquids and particles of photovoltaic material; coating the mixed dispersion liquid on the surface of one side of the semipermeable membrane layer facing the network gap to form a photoelectric material coating; and drying the photoelectric material coating to remove the volatile liquid, so that the photoelectric material coating forms discrete photoelectric material bulges.
The invention also provides a detection device, comprising: the invention relates to a sample injection ionization source.
The technical scheme of the invention has the following beneficial effects:
in the sample injection ionization source provided by the technical scheme of the invention, the excitation light emitted by the excitation light source is used for directly or indirectly exciting sample injection molecules to generate product ions, so that the sample injection molecules are ionized on the surface of the semi-permeable membrane layer after passing through the semi-permeable membrane layer, more sample injection molecules are ionized, and the ionization efficiency of the sample injection molecules is effectively improved.
Further, the sample injection film layer further comprises: discrete photovoltaic material protrusions located on the surface of the semipermeable membrane layer and in the mesh; the channel between the support mesh electrode and the counter electrode is adapted to be vented with an electron withdrawing gas. The excitation light source emits excitation light to the photoelectric material bulge so that the photoelectric material bulge generates photo-generated electrons; the photo-generated electrons, water molecules positioned on the surface of the supporting net electrode and the electron withdrawing gas form hydration intermediate ions; and the hydrated intermediate ions and sample injection molecules passing through the semipermeable membrane layer form product anions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exemplary ionization source according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an ion mobility spectrometer according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present invention provides a sample injection ionization source, referring to fig. 1, including:
a support net electrode 100 and a counter electrode 110 disposed opposite to and spaced apart from each other;
a power supply 140, wherein one end of the power supply 140 is connected with the supporting net electrode 100, and the other end of the power supply 140 is connected with the counter electrode 110;
sample introduction membrane layer, sample introduction membrane layer includes: a semipermeable membrane layer 121 located on a side surface of the supporting mesh electrode 100 facing away from the counter electrode 110;
an excitation light source 130, wherein the excitation light source 130 is adapted to emit excitation light to a side surface of the sample injection film layer facing the counter electrode 110.
The semi-permeable membrane layer 121 can enable sample injection molecules to pass through, and the semi-permeable membrane layer 121 can isolate ambient air and simultaneously realize the transmission of the sample injection molecules. The sample injection molecules comprise volatile organic molecules.
The excitation light source 130 is an ultraviolet lamp light source, and the excitation light is ultraviolet light.
The excitation light emitted by the excitation light source 130 is used for directly or indirectly exciting the sample molecules to generate product ions, so that the sample molecules are ionized on the surface of the semi-permeable membrane layer 121 after passing through the semi-permeable membrane layer 121, and more sample molecules are ionized, thereby effectively improving the ionization efficiency of the sample molecules.
The supporting mesh electrode 100 has a plurality of mesh gaps therein.
In this embodiment, the sample injection film layer further includes: discrete photovoltaic material protrusions 122 located on the surface of the semipermeable membrane layer 121 and in the network gap; the channel between the support grid electrode 100 and the counter electrode 110 is adapted to be filled with an electron withdrawing gas.
The photoelectric material protrusions 122 are graphene protrusions or carbon nanotube protrusions.
When the photovoltaic material protrusion 122 is a carbon nanotube protrusion, in one embodiment, the extending direction of the carbon nanotubes is perpendicular to the surface of the semi-permeable membrane layer 121. In other embodiments, the extending direction of the carbon nanotubes may be randomly arranged, as long as it is ensured that the protrusions of the carbon nanotubes are discretely distributed.
When the photovoltaic material protrusions 122 are graphene protrusions, in one embodiment, the microscopic arrangement of graphene is discretely tiled on the surface of the semi-permeable membrane layer 121.
The electron withdrawing gas includes any one or a combination of a plurality of halogenated hydrocarbon gases or oxygen.
The halogenated hydrocarbon gas includes a fluorocarbon gas, a chlorohydrocarbon gas, a bromohydrocarbon gas, or an iodohydrocarbon gas.
In one embodiment, the photovoltaic material protrusions 122 have a thickness of 1nm to 5000nm, such as 10 to 50nm. The thickness of the photoelectric material projection 122 refers to the dimension in the direction perpendicular to the surface of the semipermeable membrane layer 121. The thickness of the photovoltaic material protrusion 122 should not be too great to ensure good discrete characteristics of the photovoltaic material protrusion 122. The reason why the photoelectric material projections 122 need to be provided discretely is that: the transport of the sample molecules through the sample film layer is desirable to allow the sample molecules to continue through the gaps between the discrete photovoltaic material protrusions 122.
In this embodiment, the sample injection ionization source further includes: and a heating unit (not shown), which is located on the surface of the sample injection film layer opposite to the counter electrode 110, and is adapted to heat the semi-permeable film layer 121, so that the sample molecules diffuse into the photoelectric material protrusions 122 more quickly, and the photoelectric material protrusions 122 are more beneficial to generate photoelectrons, thereby improving ionization efficiency.
In one embodiment, the heating unit is configured as a metal block comprising a sample introduction channel and a heating rod.
The invention also provides a working method of the sample injection ionization source, which comprises the following steps:
the sample injection ionization source forms product positive ions in a positive ion mode;
the process of forming product positive ions by the sample injection ionization source comprises the following steps: and after passing through the semipermeable membrane layer, the sample injection molecules form product positive ions under the irradiation of laser emitted by the excitation light source.
The excitation light emitted by the excitation light source directly excites sample injection molecules passing through the semipermeable membrane layer to form product positive ions. Specifically, M+hv.fwdarw.M + Wherein M is a sample injection molecule, M + As product positive ions, hv is the energy of the excitation light.
The sample injection film layer further comprises: the supporting net electrode is provided with a plurality of net gaps; the sample injection film layer further comprises: discrete photovoltaic material protrusions located on the surface of the semipermeable membrane layer and in the mesh; the channel between the supporting net electrode and the counter electrode is suitable for introducing electron-withdrawing gas
The sample injection ionization source forms product anions in an anion mode; the process of forming product anions by the sample injection ionization source comprises the following steps: the excitation light source emits excitation light to the photoelectric material bulge so that the photoelectric material bulge generates photo-generated electrons; the photo-generated electrons, water molecules positioned on the surface of the supporting net electrode and the electron withdrawing gas form hydration intermediate ions; and the hydrated intermediate ions and sample injection molecules passing through the semipermeable membrane layer form product anions.
In one embodiment, the electron withdrawing gas is oxygen and the hydrated intermediate ions are hydrated oxygen ions O 2 - (H 2 O), M is a sample injection molecule, and the product anion is MO 2 - (H 2 O) n-1 The specific forming process is as follows:
specifically, CNTs or graphic+hv→e - ；
e - +O 2 +nH 2 O→O 2 - (H 2 O) n ；
O 2 - (H 2 O) n +M→MO 2 - (H 2 O) n-1 +H 2 O。
Wherein CNTs represent carbon nanotube protrusions, graphene represents Graphene protrusions, hv is the energy of excitation light, e - Representing photo-generated electrons, M is a sample injection molecule.
Another embodiment of the present invention further provides a method for forming a sample injection ionization source, including: providing a support net electrode, a counter electrode and a power supply; setting a sample injection film layer on the surface of the support net electrode, wherein the step of forming the sample injection film layer comprises the following steps: forming a semipermeable membrane layer on one side surface of the supporting net electrode; the supporting net electrode and the counter electrode are oppositely arranged and spaced, and the semipermeable membrane layer is positioned at one side of the supporting net electrode, which is away from the counter electrode; one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode; an excitation light source is arranged, and the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode.
The supporting net electrode is provided with a plurality of net gaps; the step of forming the sample injection film layer further comprises the following steps: forming discrete photoelectric material bulges positioned in the network gaps on one side surface of the semi-permeable membrane layer; the method for forming the sample injection ionization source further comprises the following steps: an electron withdrawing gas source is provided and is adapted to pass electron withdrawing gas through the passageway between the support grid electrode and the counter electrode.
The step of forming the photovoltaic material bump includes: providing a mixed dispersion comprising: volatile liquids and particles of photovoltaic material; coating the mixed dispersion liquid on the surface of one side of the semipermeable membrane layer facing the network gap to form a photoelectric material coating; and drying the photoelectric material coating to remove the volatile liquid, so that the photoelectric material coating forms discrete photoelectric material bulges.
In a specific embodiment, the semi-permeable membrane layer and the supporting net electrode are placed in a spin coater, the supporting net electrode faces upwards, 0.21wt% of graphene dispersed liquid is dropped on the semi-permeable membrane layer, 550 revolutions per minute is kept for 12s, then 3000 revolutions per minute is kept for 40s, and then the semi-permeable membrane layer and the supporting net electrode are placed on a heating table and kept at 150 ℃ for 10min to dry volatile liquid on the surface of the semi-permeable membrane layer.
In another embodiment, the semi-permeable membrane layer and the supporting net electrode are placed in a spin coater, the supporting net electrode faces upwards, 1wt% of carbon nano tube dispersed liquid is dropped on the semi-permeable membrane layer, 550 revolutions per minute is kept for 12s, then 3000 revolutions per minute is kept for 40s, and then the semi-permeable membrane layer and the supporting net electrode are placed on a heating table to keep the volatile liquid on the drying surface at 150 ℃ for 10 min.
In the process of forming the photoelectric material protrusions, the semipermeable membrane layer is stretched by the supporting net electrode, so that shrinkage of the semipermeable membrane layer is avoided in the process, and the dispersibility of the photoelectric material protrusions is facilitated.
Another embodiment of the present invention further provides a detection apparatus, including: the invention relates to a sample injection ionization source.
Referring to fig. 2, the detection device is an ion mobility spectrometer. The ion mobility spectrometer further comprises: a migration unit located on a side of the counter electrode 110 facing away from the support mesh electrode 100.
The migration unit includes: a plurality of spaced conductive rings 200, each of which has a different voltage applied thereto; a detector 210, the detector 210 being configured to detect product ions. The region of the migration unit is also adapted to be fed with drift gas.
In other embodiments, the detection device is a mass spectrometer.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. A sample-fed ionization source, comprising:
the device comprises a supporting net electrode and a counter electrode which are oppositely arranged and spaced, wherein a plurality of net gaps are formed in the supporting net electrode;
one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode;
sample introduction membrane layer, sample introduction membrane layer includes: the semi-permeable membrane layer is positioned on the surface of one side of the supporting net electrode, which is opposite to the counter electrode; discrete photoelectric material bulges are positioned on the surface of the semi-permeable membrane layer and in the network gaps, the photoelectric material bulges are graphene bulges or carbon nanotube bulges, the thickness of the photoelectric material bulges is 10-nm-5000 nm, and a channel between the supporting network electrode and the counter electrode is suitable for introducing electron-withdrawing gas;
the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode, and the excitation light emitted by the excitation light source is used for directly or indirectly exciting sample injection molecules to generate product ions, so that the sample injection molecules are ionized on the surface of the semi-permeable film layer after passing through the semi-permeable film layer.
2. The feed ionization source of claim 1, wherein said electron withdrawing gas comprises any one or a combination of a halogenated hydrocarbon gas or oxygen.
3. The sample injection ionization source of claim 1 wherein the excitation light source is an ultraviolet lamp source and the excitation light is ultraviolet light.
4. A method of operating a sample-fed ionization source according to any one of claims 1 to 3, comprising:
the sample injection ionization source forms product positive ions in a positive ion mode;
the process of forming product positive ions by the sample injection ionization source comprises the following steps: after passing through the semipermeable membrane layer, the sample injection molecules form product positive ions under the irradiation of laser emitted by the excitation light source;
the sample injection ionization source forms product anions in an anion mode;
the process of forming product anions by the sample injection ionization source comprises the following steps: the excitation light source emits excitation light to the photoelectric material bulge so that the photoelectric material bulge generates photo-generated electrons; the photo-generated electrons, water molecules positioned on the surface of the supporting net electrode and the electron withdrawing gas form hydration intermediate ions; and the hydrated intermediate ions and sample injection molecules passing through the semipermeable membrane layer form product anions.
5. A method of forming a sample-fed ionization source, comprising:
providing a supporting net electrode, a counter electrode and a power supply, wherein the supporting net electrode is provided with a plurality of net gaps;
setting a sample injection film layer on the surface of the support net electrode, wherein the step of forming the sample injection film layer comprises the following steps: forming a semipermeable membrane layer on one side surface of the supporting net electrode; forming discrete photoelectric material bulges in the network gaps on one side surface of the semipermeable membrane layer, wherein the photoelectric material bulges are graphene bulges or carbon nanotube bulges, and the thickness of the photoelectric material bulges is 10 nm-5000nm;
the supporting net electrode and the counter electrode are oppositely arranged and spaced, and the semipermeable membrane layer is positioned at one side of the supporting net electrode, which is away from the counter electrode;
one end of the power supply is connected with the supporting net electrode, and the other end of the power supply is connected with the counter electrode;
setting an excitation light source, wherein the excitation light source is suitable for emitting excitation light to the surface of one side of the sample injection film layer, which faces the counter electrode; the excitation light emitted by the excitation light source is used for directly or indirectly exciting sample injection molecules to generate product ions, so that the sample injection molecules are ionized on the surface of the semi-permeable membrane layer after passing through the semi-permeable membrane layer;
an electron withdrawing gas source is provided and is adapted to pass electron withdrawing gas through the passageway between the support grid electrode and the counter electrode.
6. The method of claim 5, wherein the step of forming the photovoltaic material protrusions comprises: providing a mixed dispersion comprising: volatile liquids and particles of photovoltaic material; coating the mixed dispersion liquid on the surface of one side of the semipermeable membrane layer facing the network gap to form a photoelectric material coating; and drying the photoelectric material coating to remove the volatile liquid, so that the photoelectric material coating forms discrete photoelectric material bulges.
7. A detection apparatus, characterized by comprising: a sample-fed ionization source according to any one of claims 1 to 3.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629933A (en) * | 2008-07-16 | 2010-01-20 | 同方威视技术股份有限公司 | Ion mobility spectrometer |
| RU2475882C1 (en) * | 2011-06-16 | 2013-02-20 | Федеральное государственное унитарное предприятие "Научно-исследовательский технологический институт имени А.П. Александрова" | Bipolar ionisation source |
| CN103311089A (en) * | 2013-04-12 | 2013-09-18 | 李鹏 | Photoelectric-effect ion source based on carbon nano-tubes |
| CN106024573A (en) * | 2016-06-29 | 2016-10-12 | 苏州微木智能系统有限公司 | Photoemission ionization source |
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| US9310308B2 (en) * | 2012-12-07 | 2016-04-12 | Ldetek Inc. | Micro-plasma emission detector unit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629933A (en) * | 2008-07-16 | 2010-01-20 | 同方威视技术股份有限公司 | Ion mobility spectrometer |
| RU2475882C1 (en) * | 2011-06-16 | 2013-02-20 | Федеральное государственное унитарное предприятие "Научно-исследовательский технологический институт имени А.П. Александрова" | Bipolar ionisation source |
| CN103311089A (en) * | 2013-04-12 | 2013-09-18 | 李鹏 | Photoelectric-effect ion source based on carbon nano-tubes |
| CN106024573A (en) * | 2016-06-29 | 2016-10-12 | 苏州微木智能系统有限公司 | Photoemission ionization source |
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