CN203432907U - Graphene molecular sensor based on localized surface plasmon resonance - Google Patents
Graphene molecular sensor based on localized surface plasmon resonance Download PDFInfo
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- CN203432907U CN203432907U CN201320018316.4U CN201320018316U CN203432907U CN 203432907 U CN203432907 U CN 203432907U CN 201320018316 U CN201320018316 U CN 201320018316U CN 203432907 U CN203432907 U CN 203432907U
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Abstract
The utility model relates to a graphene molecular sensor based on localized surface plasmon resonance. The sensor comprises a light source system, a transparent metal nano-particle film system, a graphene molecular adsorption system and a detection system, wherein when molecules are adsorbed onto the surface of graphene, carrier concentration and dielectric constant in the graphene change, and the localized surface plasmon resonance frequency of the transparent metal nano-particle film system is influenced, so that the type and concentration of molecules can be detected. The sensor is simple in preparation process, low in cost and convenient to operate, graphene can be used for effectively protecting metal from corrosion and passivation, the service life of the system can be prolonged, toxicity or occurrence of related chemical reactions caused by contact between the metal and the molecules can be prevented, and the system is good in stability and high in sensitivity.
Description
Technical field
The utility model relates to chemical type sensor, especially the molecule sensor of the local surface plasma based on Graphene.
Background technology
Local surface plasma resonance is that the electric charge concussion being present in metal nanoparticle or discontinuous metal Nano structure is subject to incident photon to excite produced resonance effect.The local electromagnetic field on metal Nano structure surface is greatly strengthened, and shows strong surface plasma body resonant vibration and absorbs.The noble metal nano particles such as gold, silver, platinum all has very strong local surface plasma resonance effect, and they show very strong optical absorption at Uv and visible light wave band.The peak position of this absorption spectrum depends on micromechanism and the characteristic of material, as composition, shape, size, local conductivity.Obtain local surface plasma resonance absorption spectrum and it is analyzed, can study the microstructure composition of nano particle, can also, as chemistry and biomolecule sensor, utilize kind and the concentration of using optical instrument to detect biochemical molecular simultaneously.This technology is with a wide range of applications in fields such as optoelectronic device, sensing technology, life sciences.
At present, sensor based on surface plasma body resonant vibration has obtained fast development, but the sensor process of the type is complicated, simultaneously ubiquity metal (particularly silver) and is very easily corroded and passivation in air, some molecules metal surface easily lose activity or and Metal Contact after have the problems such as toxic reaction.Conventional method is to apply protective seam in metal surface.But because the local electric field intensity range index that surface plasma body resonant vibration produces is decayed, so need to get over Bao Yuehao by this protective seam.
Graphene (graphene) is a kind of carbon two-dimensional material of monatomic bed thickness, is the basic comprising unit of other material with carbon element allotrope.2004 Andre professor Geim of Nian， University of Manchester leaders' research group found that Graphene has also caused the extensive concern of science and industry member immediately at first, and the discoverer of Graphene has more obtained Nobel Prize in physics in 2010.Graphene has very high specific surface area (2630m
2/ g), for molecule, have good suction-operated, the carrier concentration in Graphene is for the absorption of molecule sensitivity very.Meanwhile, when Graphene directly contacts with metal nanoparticle, the carrier concentration in Graphene changes and can modulate the local surface plasma resonance frequency on metal nanoparticle surface.In addition, carbon atom demonstrates very strong inertia in air, so can effectively prevent that when Graphene covers in metal surface metal from directly contacting with molecule, also can prevent that metal is corroded and passivation in air.
Summary of the invention
For solve the metal nanoparticle of current surface plasma resonance sensor be easily corroded and some molecules in metal surface, easily lose activity or with the toxic problem of reacting of Metal Contact, a kind of graphite based on local surface plasma resonance the utility model proposes molecule sensor that confuses can effectively prevent that metal from directly contacting with molecule, also can prevent that metal is corroded and passivation in air.
For reaching above object, the utility model solves the technical scheme that its technical matters adopts: a kind of graphene molecules sensor based on local surface plasma resonance, comprise light-source system, transparent metal nanometer particle film system, detection system, transparent metal nanometer particle film system is provided with graphene molecules adsorption system, described graphene molecules adsorption system is graphene film, described transparent metal nanometer particle film system be film of metal nano-particles respectively with surperficial graphene film and substrate of glass close contact below, formed graphene film, film of metal nano-particles, substrate of glass structure.
Light-source system described in the utility model is to produce the required incident light of sensor; Described transparent metal nanometer particle film system is the module for generation of local surface plasma resonance; Described graphene molecules adsorption system is that carrier concentration and specific inductive capacity in Graphene change when molecular adsorption is behind Graphene surface, and then affects the local surface plasma resonance frequency of transparent metal nanometer particle film system; Described detection system is to measure the outgoing light intensity see through from graphene molecules adsorption system and type and the concentration of peak position judgement molecule.Described incident light is generally white light source; The object that described transparent metal nanometer particle film system is bearing metal nano particle is transparent, light transmission features, and metal nanoparticle can produce surface plasma body resonant vibration, conventional gold, silver, platinum.Described transparent metal nanometer particle film system and graphene molecules adsorption system are joined, and form direct-coupled interface, guarantee that the variation of carrier concentration in Graphene can affect electron concentration and the surface plasma body resonant vibration frequency in metal nanoparticle.
Adopt after above technical scheme, the beneficial effects of the utility model are: this sensor preparation technology is very simple, with low cost, easy to operate, and Graphene can effectively prevent that metal is corroded and passivation, guarantee the serviceable life of system, can also prevent the toxicity that metal causes to molecule contact or relevant chemical reaction occurs, the good stability of system, highly sensitive.
Accompanying drawing explanation
Fig. 1 is the Graphene Fundamentals of Sensors schematic diagram of the utility model based on local surface plasma resonance.
Fig. 2 is silver nano-grain 200 degrees Celsius of scanning electron microscope (SEM) photographs that heat after 15 minutes in air that the utility model Graphene covers.
Fig. 3 is simple silver nano-grain 200 degrees Celsius of scanning electron microscope (SEM) photographs that heat after 15 minutes in air as a comparison.
Fig. 4 is the plasma resonance extinction spectrum of graphene molecules sensor-based system after absorption variable concentrations tetraphenylporphyrin (TPP) molecule in the utility model example 1.
Embodiment
Shown in Fig. 1, a kind of graphene molecules sensor based on local surface plasma resonance of the utility model, comprise light-source system, transparent metal nanometer particle film system, detection system, transparent metal nanometer particle film system is provided with graphene molecules adsorption system, described graphene molecules adsorption system is graphene film, described transparent metal nanometer particle film system be film of metal nano-particles respectively with surperficial graphene film and substrate of glass close contact below, formed graphene film, film of metal nano-particles, substrate of glass structure.
Light-source system described in the utility model is to produce the required incident light of sensor; Described transparent metal nanometer particle film system is the module for generation of local surface plasma resonance; Described graphene molecules adsorption system is that carrier concentration and specific inductive capacity in Graphene change when molecular adsorption is behind Graphene surface, and then affects the local surface plasma resonance frequency of transparent metal nanometer particle film system; Described detection system is to measure the outgoing light intensity see through from graphene molecules adsorption system and type and the concentration of peak position judgement molecule.Described incident light is generally white light source; The object that described transparent metal nanometer particle film system is bearing metal nano particle is transparent, light transmission features, and metal nanoparticle can produce surface plasma body resonant vibration, conventional gold, silver, platinum.Described transparent metal nanometer particle film system and graphene molecules adsorption system are joined, and form direct-coupled interface, guarantee that the variation of carrier concentration in Graphene can affect electron concentration and the surface plasma body resonant vibration frequency in metal nanoparticle.
The utility model is because Graphene can effectively protect metal to be corroded in air; Fig. 2 and Fig. 3 are compared and can be found out; while there is no Graphene protection, silver nano-grain has occurred reuniting and pattern variation has occurred, and the covering of Graphene can effectively prevent corrosion of metal and passivation.
Claims (2)
1. the graphene molecules sensor based on local surface plasma resonance, it is characterized in that: comprise light-source system, transparent metal nanometer particle film system, detection system, transparent metal nanometer particle film system is provided with graphene molecules adsorption system, and described graphene molecules adsorption system is graphene film.
2. a kind of graphene molecules sensor based on local surface plasma resonance according to claim 1, is characterized in that: described light-source system is incident light, and described incident light is white light source; The object that described transparent metal nanometer particle film system is bearing metal nano particle is transparent, light transmission features, and metal nanoparticle can produce surface plasma body resonant vibration, is gold, silver, platinum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320018316.4U CN203432907U (en) | 2013-01-15 | 2013-01-15 | Graphene molecular sensor based on localized surface plasmon resonance |
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| CN201320018316.4U CN203432907U (en) | 2013-01-15 | 2013-01-15 | Graphene molecular sensor based on localized surface plasmon resonance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063619A (en) * | 2013-01-15 | 2013-04-24 | 泰州巨纳新能源有限公司 | Graphene molecule sensor based on localized surface plasma resonance |
| CN103983613A (en) * | 2014-06-11 | 2014-08-13 | 中国农业科学院农业质量标准与检测技术研究所 | Ractopamine molecularly imprinted SPR (surface plasma resonance) sensor chip as well as preparation method thereof |
| CN106290305A (en) * | 2016-10-26 | 2017-01-04 | 中国计量大学 | Raman scattering substrate is strengthened based on optical fiber evanescent field auxiliary surface |
-
2013
- 2013-01-15 CN CN201320018316.4U patent/CN203432907U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063619A (en) * | 2013-01-15 | 2013-04-24 | 泰州巨纳新能源有限公司 | Graphene molecule sensor based on localized surface plasma resonance |
| CN103983613A (en) * | 2014-06-11 | 2014-08-13 | 中国农业科学院农业质量标准与检测技术研究所 | Ractopamine molecularly imprinted SPR (surface plasma resonance) sensor chip as well as preparation method thereof |
| CN106290305A (en) * | 2016-10-26 | 2017-01-04 | 中国计量大学 | Raman scattering substrate is strengthened based on optical fiber evanescent field auxiliary surface |
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Granted publication date: 20140212 |
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