DE102016101001A1 - Device for the detection and characterization of organic molecules in a liquid sample volume - Google Patents
Device for the detection and characterization of organic molecules in a liquid sample volume Download PDFInfo
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- DE102016101001A1 DE102016101001A1 DE102016101001.4A DE102016101001A DE102016101001A1 DE 102016101001 A1 DE102016101001 A1 DE 102016101001A1 DE 102016101001 A DE102016101001 A DE 102016101001A DE 102016101001 A1 DE102016101001 A1 DE 102016101001A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502715—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by interfacing components, e.g. fluidic, electrical, optical or mechanical interfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
- G01N21/554—Attenuated total reflection and using surface plasmons detecting the surface plasmon resonance of nanostructured metals, e.g. localised surface plasmon resonance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/168—Specific optical properties, e.g. reflective coatings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N2021/0346—Capillary cells; Microcells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/05—Flow-through cuvettes
- G01N2021/058—Flat flow cell
Abstract
Mit einer Vorrichtung zur Detektion und Charakterisierung von organischen Molekülen in einem flüssigen Probenvolumen im Mikro- und Submikroliter-Bereich mittels Raman- und Infrarotspektroskopie, insbesondere mittels RR, SERS, SECARS und SEIRA soll eine einfache Detektion und Charakterisierung von organischen Molekülen mit einer Konzentration unterhalb des ppm-Bereiches in einem flüssigen Probenvolumen im Mikro- und Submikroliter-Bereich aufgrund der Schwingungseigenschaften der Moleküle mittels der vorgenannten Verfahren der Raman-Spektroskopie und der Infrarotspektroskopie in einer einzigen Vorrichtung erreicht werden. Dies wird durch einen Mikrofluidikchip (2) mit wenigstens einem nach oben offenen Mikrofluidikkanal (3) zum Durchströmen des Probenvolumens und durch eine den wenigstens einen Mikrofluidikkanal (3) abdeckende, als Messfenster dienende transparente Platte (7), welche auf der dem wenigstens einen Mikrofluidikkanal (3) zugewandten Seite mit einem Metallinselfilm beschichtet ist, und durch eine auf die Platte (7) gerichtete Detektionsoptik (14) erreicht, welche Licht auf die Platte (7) strahlt und die reflektierten Lichtstrahlen empfängt.With a device for the detection and characterization of organic molecules in a liquid sample volume in the micro- and sub-microliter range by Raman and infrared spectroscopy, in particular by means of RR, SERS, SECARS and SEIRA, a simple detection and characterization of organic molecules with a concentration below the ppm range in a micro- and submicroliter-range liquid sample volume due to the vibrational properties of the molecules are achieved by the aforementioned Raman spectroscopy and infrared spectroscopy techniques in a single device. This is done by a microfluidic chip (2) with at least one microfluidic channel (3) open at the top for flowing through the sample volume and by a transparent plate (7) covering the at least one microfluidic channel (3) serving as a measuring window, which is on the at least one microfluidic channel (3) facing side is coated with a metal island film, and by a directed to the plate (7) detection optics (14) which radiates light on the plate (7) and receives the reflected light rays.
Description
Die Erfindung betrifft eine Vorrichtung zur Detektion und Charakterisierung von organischen Molekülen in einem flüssigen Probenvolumen im Mikro- und Submikroliter-Bereich mittels Raman- und Infrarotspektroskopie, insbesondere mittels RR (resonanter Ramanspektroskopie), SERS (surface-enhanced Raman spectroscopy), SECARS (surface-enhanced coherent anti-Stokes Raman spectroscopy) und SEIRA (surface-enhanced infrared absorption). The invention relates to a device for the detection and characterization of organic molecules in a liquid sample volume in the microliter and submicroliter range by means of Raman and infrared spectroscopy, in particular by means of RR (Raman Resonant Spectroscopy), SERS (Surface-Enhanced Raman Spectroscopy), SECARS (Surface- enhanced coherent anti-Stokes Raman spectroscopy) and SEIRA (surface-enhanced infrared absorption).
Im Bereich der Infrarot-Absorptionsspektroskopie an mikrofluidischen Kanälen sind Konzepte mit speziell für diesen Zweck gefertigten Transmissionskomponenten unter Verwendung der oberflächenverstärkten Infrarotabsorption bekannt. Der Nachteil dieser Transmissionskomponenten besteht in der Verwendung von kostenintensiven Materialien und strengen Desgin-Limitationen für die Mikrofluidikkanäle. Für die oberflächenverstärkte Raman-Streuung existieren verschiedene Konzepte zur Untersuchung in mikrofluidischen Komponenten. Kombinierte Infrarot- und Raman-Konzepte für die Mikrofluidik sind bisher nicht bekannt. In the field of infrared absorption spectroscopy on microfluidic channels, concepts with specially prepared transmission components using surface enhanced infrared absorption are known. The disadvantage of these transmission components is the use of costly materials and strict desgin limitations for the microfluidic channels. For surface-enhanced Raman scattering, various concepts exist for investigation in microfluidic components. Combined infrared and Raman concepts for microfluidics are not yet known.
Aufgabe der Erfindung ist es, eine einfache Detektion und Charakterisierung von organischen Molekülen mit einer Konzentration unterhalb des ppm-Bereiches in einem flüssigen Probenvolumen im Mikro- und Submikroliter-Bereich aufgrund der Schwingungseigenschaften der Moleküle mittels der vorgenannten Verfahren der Raman-Spektroskopie und der Infrarotspektroskopie in einer einzigen Vorrichtung erreichen zu können. The object of the invention is a simple detection and characterization of organic molecules with a concentration below the ppm range in a liquid sample volume in the micro and sub microliter range due to the vibration properties of the molecules by means of the aforementioned methods of Raman spectroscopy and infrared spectroscopy in to achieve a single device.
Diese Aufgabe wird bei einer Vorrichtung der eingangs bezeichneten Art gelöst durch einen Mikrofluidikchip mit wenigstens einem nach oben offenen Mikrofluidikkanal zum Durchströmen des Probenvolumens und durch eine den wenigstens einen Mikrofluidikkanal abdeckende, als Messfenster dienende transparente Platte, welche auf der dem wenigstens einen Mikrofluidikkanal zugewandten Seite mit einem Metallinselfilm beschichtet ist, und durch eine auf die Platte gerichtete Detektionsoptik, welche Licht auf die Platte strahlt und die reflektierten Lichtstrahlen empfängt. This object is achieved in a device of the type described by a Mikrofluidikchip with at least one open-microfluidic channel for flowing through the sample volume and by the at least one microfluidic channel covering, serving as a measuring window transparent plate, which on the at least one microfluidic channel side facing a metal-insensitive film, and a detection optic directed to the plate, which emits light onto the plate and receives the reflected light rays.
Die erfindungsgemäße Vorrichtung eignet sich somit zur Auswertung der an der Grenzfläche zwischen dem Metallinselfilm und dem Probenvolumen reflektierten Lichtstrahlung. Die unterschiedlichen Topologien des Metallinselfilms vermitteln mittels ihrer optischen Eigenschaften Verstärkungseffekte für die simultane Nutzung von Verfahren der Raman-Spektroskopie und der Infrarotspektroskopie. Dabei erlaubt die Verwendung einer solchen Rückseitenreflexionsgeometrie die Herstellung des eigentlichen Mikrofluidikchips aus einem kostengünstigen Polymermaterial, weil der Mikrofluidikchip selbst nicht vom einfallenden Licht durchdrungen wird und somit keine Auswertung der Transmission erfolgt. Die Vorrichtung ist somit als Zubehör zur Raman- und IR-Spektroskopie mit abbildenden Optiken, optischen Fasern und/oder der Verwendung von brillanten Strahlungsquellen (z.B. Gas-Laser, QCLs) geeignet. Da die Vorrichtung eine kombinierte Infrarot- und Raman-Analyse möglich macht, wird eine gegenüber einem einzigen Messverfahren höhere Erkennungsrate für die Diagnostik ermöglicht. Außerdem ist der Probenverbrauch sehr gering und liegt z.B. im Submikroliter-Bereich. The device according to the invention is therefore suitable for evaluating the light radiation reflected at the interface between the metal-island film and the sample volume. The different topologies of the metal-island film, by means of their optical properties, impart amplification effects for the simultaneous use of Raman spectroscopy and infrared spectroscopy techniques. The use of such a backside reflection geometry allows the production of the actual microfluidic chip from a cost-effective polymer material, because the microfluidic chip itself is not penetrated by the incident light and thus no evaluation of the transmission takes place. The device is thus suitable as an accessory to Raman and IR spectroscopy with imaging optics, optical fibers, and / or the use of brilliant radiation sources (e.g., gas lasers, QCLs). Since the device makes a combined infrared and Raman analysis possible, a higher detection rate for the diagnosis compared to a single measuring method is made possible. In addition, the sample consumption is very low and is e.g. in the submicroliter range.
Besonders bevorzugt ist vorgesehen, dass der Mikrofluidikchip und die Platte auswechselbar in einer gemeinsamen Halteeinrichtung angeordnet sind. Dadurch wird die Handhabung erleichtert, insbesondere kann der Mikrofluidikchip auf einfache Weise ausgetauscht werden. Particularly preferably, it is provided that the microfluidic chip and the plate are interchangeable arranged in a common holding device. This facilitates handling, in particular the microfluidic chip can be exchanged in a simple manner.
Die transparente Platte muss selbstverständlich aus einem Material gewählt werden, das sowohl für sichtbares Licht (Raman-Spektroskopie) als auch für Infrarot durchlässig ist. Bevorzugt ist deshalb vorgesehen, dass die Platte aus Calciumfluorid, Bariumfluorid oder Zinkselenid besteht. Of course, the transparent plate must be chosen from a material that is transparent to both visible light (Raman spectroscopy) and infrared. It is therefore preferred that the plate consists of calcium fluoride, barium fluoride or zinc selenide.
Dagegen kann der Mikrofluidikchip aus kostengünstigen Materialien bestehen. Bevorzugt besteht er z.B. aus Kunststoff (Polymermaterial) oder Glas. In contrast, the microfluidic chip may consist of inexpensive materials. It preferably consists of e.g. made of plastic (polymer material) or glass.
Der Metallinselfilm kann grundsätzlich aus verschiedenen Metallen bestehen. Besonders bevorzugt werden Gold oder Silber verwendet. Andere Metalle, z.B. Platin, sind ebenfalls geeignet. The metal island film can basically consist of different metals. Particular preference is given to using gold or silver. Other metals, e.g. Platinum, are also suitable.
Der Metallinselfilm kann grundsätzlich auf verschiedene Weise auf die Platte aufgebracht werden. Bevorzugt ist vorgesehen, dass der Metallinselfilm durch thermisches Verdampfen unter Hochvakuumbedingungen auf die Platte aufgebracht ist, d.h. aufgedampft ist. Alternativ können auch kollodiale Lösungen oder Ätzverfahren zur Herstellung eingesetzt werden. Die einzelnen Metallinseln weisen Abmessungen in einer Größenordnung von 20 bis 100 nm auf, der wenigstens eine Mikrokanal des Mikrofluidikchips hat dagegen eine Breite in der Größenordnung von 50 bis 100 µm. Die Bedeckung der Platte im Bereich des Messfensters mit dem Metallinselfilm liegt gegenüber der Gesamtfläche im Messfenster für Infrarot bei etwa 80 bis 90 %, für Raman reicht eine wesentlich geringere Bedeckungsrate aus. The metal island film can basically be applied to the board in a variety of ways. It is preferably provided that the metal island film is applied to the plate by thermal evaporation under high vacuum conditions, i. evaporated. Alternatively, colloidal solutions or etching processes can also be used for the production. The individual metal islands have dimensions in the order of magnitude of 20 to 100 nm, whereas the at least one microchannel of the microfluidic chip has a width of the order of magnitude of 50 to 100 μm. The coverage of the plate in the area of the measuring window with the metal island film is about 80 to 90% compared to the total area in the measuring window for infrared, for Raman a much lower coverage rate is sufficient.
In vorteilhafter weiterer Ausgestaltung ist vorgesehen, dass der Metallinselfilm durch eine ultradünne Schutzschicht abgedeckt ist. Diese, einige nm dicke Schutzschicht, die z.B. aus Siliciumoxid besteht, ermöglicht die mehrfache Verwendbarkeit und Reinigung der den Mikrofluidikkanal abdeckenden Platte. In an advantageous further embodiment, it is provided that the metal island film is covered by an ultrathin protective layer. This, some nm thick protective layer, which consists for example of silicon oxide, allows multiple usability and Cleaning the microfluidic channel covering plate.
In weiterer Ausgestaltung ist vorgesehen, dass auf den Metallinselfilm bzw. die Schutzschicht eine ultradünne organische funktionale Schicht aufgebracht ist. Durch eine derartige ultradünne (einige nm dicke) organische funktionale Schicht in Form von Molekülen lassen sich spezifische Moleküle im Probenvolumen erkennen, so dass dadurch ein funktionaler Biosensor realisierbar ist. In a further embodiment it is provided that an ultrathin organic functional layer is applied to the metal film or the protective layer. By means of such an ultrathin (a few nm thick) organic functional layer in the form of molecules, specific molecules can be detected in the sample volume so that a functional biosensor can be realized.
Die Erfindung ist nachstehend anhand der Zeichnung beispielhaft näher erläutert. Diese zeigt in The invention is explained in more detail below by way of example with reference to the drawing. This shows in
Eine Vorrichtung zur Detektion und Charakterisierung von organischen Molekülen in einem flüssigen Probenvolumen im Mikro- und Submikroliter-Bereich mittels oberflächenverstärkter Raman- und Infrarot-Spektroskopie ist allgemein mit
RR (resonanter Ramanspektroskopie), SERS (surface-enhanced Raman spectroscopy), SECARS (surface-enhanced coherent anti-Stokes Raman spectroscopy) und SEIRA (surface-enhanced infrared absorption). RR (resonant Raman spectroscopy), SERS (surface-enhanced Raman spectroscopy), SECARS (surface-enhanced coherent anti-Stokes Raman spectroscopy) and SEIRA (surface-enhanced infrared absorption).
Die Vorrichtung
Wenigstens der Bereich des Mikrofluidikkanals
Diese Metallinseln
Zur ortsfesten Verbindung der Platte
Die Vorrichtung
Der Metallinselfilm weist eine Vielzahl von Metallinseln
Um den Metallinselfilm sowohl für Raman als auch für Infrarot nutzen zu können, gibt es grundsätzlich zwei Möglichkeiten. In order to use the metal island film both for Raman and for infrared, there are basically two options.
Eine erste Möglichkeit ist in
Eine isotrope Anordnung ist in
Zur Durchführung einer Probenanalyse wird das Probenvolumen im Mikro- oder sogar nur Submikroliterbereich durch den Mikrofluidikkanal
Aufgrund des Aufbaus der Vorrichtung
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1 1
- Vorrichtung contraption
- 2 2
- Mikrofluidikchip microfluidic
- 3 3
- Mikrofluidikkanal microfluidic
- 4 4
- Einlass inlet
- 5 5
- Auslass outlet
- 6 6
- Pfeile arrows
- 7 7
- Platte plate
- 8 8th
- Metallinsel metal island
- 9 9
- Halteeinrichtung holder
- 10 10
- Öffnung opening
- 11 11
- Öffnung opening
- 12 12
- oberer Randbereich upper edge area
- 13 13
- Klemmplatte clamp
- 14 14
- Detektionsoptik detection optics
- 15 15
- einfallende Lichtstrahlen incident light rays
- 16 16
- reflektierte Lichtstrahlen reflected light rays
- 17 17
- Infrarot-Polarisationsrichtung Infrared polarization direction
- 18 18
- Raman-Polarisationsrichtung Raman polarization direction
Claims (8)
Priority Applications (2)
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DE102016101001.4A DE102016101001B4 (en) | 2016-01-21 | 2016-01-21 | Device for the detection and characterization of organic molecules in a liquid sample volume |
PCT/EP2017/050864 WO2017125374A1 (en) | 2016-01-21 | 2017-01-17 | Device for detecting and characterising organic molecules in a liquid sample volume |
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DE102016101001.4A DE102016101001B4 (en) | 2016-01-21 | 2016-01-21 | Device for the detection and characterization of organic molecules in a liquid sample volume |
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DE102019219949A1 (en) * | 2019-12-18 | 2021-06-24 | Robert Bosch Gmbh | Substrate |
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EP3586962A1 (en) * | 2018-06-22 | 2020-01-01 | Unchained Labs Germany GmbH | Magnetic sample holder system for a raman microscope |
CN110865066A (en) * | 2019-11-18 | 2020-03-06 | 南通大学 | Raman spectrum sample box with total reflection structure |
CN113058668B (en) * | 2021-03-20 | 2022-05-27 | 山东大学 | Artificial surface plasmon micro-fluidic detection chip structure based on capacitive metamaterial structure and preparation and detection methods thereof |
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KR101573724B1 (en) * | 2013-11-22 | 2015-12-02 | 한국과학기술연구원 | Method of fabricating nanoantennas array, nanoantennas array chip and a structure for lithography |
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2016
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DE112004001972T5 (en) * | 2003-10-17 | 2006-08-17 | Intel Corporation, Santa Clara | A method and apparatus for detecting small numbers of molecules using surface enhanced coherent anti-Stokes Raman spectroscopy |
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DE102019219949A1 (en) * | 2019-12-18 | 2021-06-24 | Robert Bosch Gmbh | Substrate |
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