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Graphene molecule sensor based on localized surface plasma resonance

A plasmonic resonance and molecular sensor technology, which is applied in transmittance measurement and other directions, can solve the problems of complex sensor technology, easy corrosion of metals, easy loss of activity, etc., and achieve the effects of simple preparation process, guaranteed service life and low cost.

Inactive Publication Date: 2013-04-24
泰州巨纳新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, sensors based on surface plasmon resonance have been developed rapidly, but this type of sensor technology is complex, and metals (especially silver) are commonly corroded and passivated in the air, and some molecules are easily lost on the metal surface. There will be problems such as activity or toxic reactions after contact with metals

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  • Graphene molecule sensor based on localized surface plasma resonance
  • Graphene molecule sensor based on localized surface plasma resonance
  • Graphene molecule sensor based on localized surface plasma resonance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Implement as follows

[0027] 1. Coating a 5 nm gold film on the glass surface, heating at 500°C for 30 minutes in a vacuum state, and then rapidly cooling to make the gold particles agglomerate into nanoparticles;

[0028] 2. Synthesize a single-layer graphene film by chemical vapor phase method, and transfer the graphene film to cover the surface of gold nanoparticles;

[0029] 3. Soak the system in the tetraphenylporphyrin (TPP) molecule to be tested at a concentration of 10 -5 ML, 5x10 -4 ML and 8x10 -4 ML, take it out after 20 minutes, and rinse with water to ensure that the molecules are evenly distributed on the graphene surface;

[0030] 4. Detect the transmitted light through the system. Such as Figure 4 As shown, with the increase of the molecular concentration, the peak position of the surface plasmon resonance absorption spectrum of gold nanoparticles gradually shifted to the long wavelength, which proved that the sensor can work effectiv...

Embodiment 2

[0031] Embodiment 2: implement according to the following steps

[0032] 1. Coat a 3 nm silver film on the glass surface, heat it at 300°C for 15 minutes in a vacuum state, and then cool it rapidly to make the silver particles agglomerate into nanoparticles;

[0033] 2. Synthesize graphene film by chemical vapor phase method, and transfer the graphene film to cover the surface of silver nanoparticles;

[0034] 3. Soak the system in the rhodamine 6g (R6G) molecule to be tested for 20 minutes, take it out, and rinse it with water to ensure that the molecules are evenly distributed on the graphene surface;

[0035] 4. Detect the transmitted light through the system, and judge the type and concentration of molecules according to the change of plasmon resonance absorption spectrum.

[0036] Omit test results.

Embodiment 3

[0037] Embodiment 3: implement according to the following steps

[0038] 1. Platinum thin film of 10 nm is coated on the glass surface, heated at 700°C for 60 minutes in a vacuum state, and then rapidly cooled to make the platinum particles agglomerate into nanoparticles;

[0039] 2. Synthesize graphene film by chemical vapor phase method, and transfer the graphene film to cover the surface of platinum nanoparticles;

[0040] 3. Soak the system in the rhodamine B (RhB) molecule to be tested for 20 minutes, take it out, and rinse it with water to ensure that the molecules are evenly distributed on the graphene surface;

[0041] 4. Detect the transmitted light through the system, and judge the type and concentration of molecules according to the change of plasmon resonance absorption spectrum.

[0042] Since graphene can effectively protect metals from being corroded in the air, the figure 2 and image 3 By comparison, it can be seen that without the protection of graphene, th...

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Abstract

The invention relates to a graphene molecule sensor based on localized surface plasma resonance. The sensor comprises a light source system, a transparent metal nanoparticle film system, a graphene molecule adsorbing system and a detection system. After molecules are adsorbed on the surface of graphene, the carrier concentration and the dielectric constant in the graphene are changed, so that the localized surface plasma resonance frequency of the transparent metal nanoparticle film system is influenced, and the type and the concentration of the molecules are detected. The sensor has the characteristics that the preparation process is simple, the cost is low and the operation is convenient; besides, the graphene can be effectively protected from being corroded or inactivated, and the service life of the system is guaranteed; and moreover, toxic or related chemical reaction resulted by the contact between the metal and the molecule can be prevented, the stability of the system is good, and the sensitivity is high.

Description

technical field [0001] The present invention relates to chemical sensors, especially molecular sensors based on graphene localized surface plasmons. Background technique [0002] Localized surface plasmon resonance (LSP) is a resonance phenomenon in which charge oscillations in metal nanoparticles or discontinuous metal nanostructures are excited by incident photons. The localized electromagnetic field on the surface of metal nanostructures is greatly enhanced, exhibiting strong surface plasmon resonance absorption. Noble metal nanoparticles such as gold, silver, and platinum all have strong localized surface plasmon resonance effects, and they exhibit strong optical absorption in the ultraviolet and visible light bands. The peak position of this absorption spectrum depends on the microstructure and properties of the material, such as composition, shape, size, local conductivity. Obtaining and analyzing the local surface plasmon resonance absorption spectrum can study the ...

Claims

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Application Information

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IPC IPC(8): G01N21/59
Inventor 倪振华南海燕梁铮丁荣义理林
Owner 泰州巨纳新能源有限公司
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