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Method for manufacturing graphene/gold surface-enhanced Raman spectrum substrate

A surface-enhanced Raman and graphene technology, applied in Raman scattering, material analysis by optical means, material excitation analysis, etc., can solve the problems of lack of precious metal substrates, insufficient utilization of gold nanoparticles, etc., to improve reuse performance, cost reduction, and enhanced performance

Inactive Publication Date: 2013-02-06
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of insufficient utilization of gold nanoparticles in existing noble metal surface-enhanced Raman spectroscopy substrates and the lack of noble metal substrates, and provides a preparation method for graphene / gold surface-enhanced Raman spectroscopy substrates

Method used

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  • Method for manufacturing graphene/gold surface-enhanced Raman spectrum substrate
  • Method for manufacturing graphene/gold surface-enhanced Raman spectrum substrate
  • Method for manufacturing graphene/gold surface-enhanced Raman spectrum substrate

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specific Embodiment approach 1

[0014] Specific embodiment one: the preparation method of a kind of graphene / gold surface-enhanced Raman spectrum substrate of the present embodiment is carried out according to the following steps: one, prepare graphene oxide aqueous solution: add 1.2g phosphorus in conical flask Graphite flakes, add 55-65ml of 98% H 2 SO 4 And 6.7~8ml mass percentage content is the phosphoric acid of 85%, then add 8~12gKMnO 4 , reacted for 1.5 to 2.5 hours, moved into a water bath at 35°C for 20 to 24 hours, then added 250 to 300ml of deionized water, and after 10 to 15 minutes, added 30 to 35ml of hydrogen peroxide with a mass percentage of 25% to 30%. Clean the graphene oxide, and then ultrasonically disperse it in the aqueous solution to obtain the graphene oxide aqueous solution, wherein the stirring is continued during the preparation process;

[0015] Two, preparation mass percentage composition is 0.4%~0.6% tetrachloroauric acid aqueous solution and is cooled to 3~4 ℃, preparation m...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 3, the reflux reaction is carried out under stirring conditions for 1 h. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step 3, the mass ratio of tetrachloroauric acid aqueous solution and graphene oxide aqueous solution is 36: 1, and the volume of tetrachloroauric acid aqueous solution and sodium citrate aqueous solution The ratio is 19:20.5, and the volume ratio of tetrachloroauric acid aqueous solution to silver nitrate solution is 20:1.8. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for manufacturing a graphene / gold surface-enhanced Raman spectrum substrate and relates to a method for manufacturing a surface-enhanced Raman spectrum substrate. The problems that gold nanoparticles of the conventional precious metal surface-enhanced Raman spectrum substrate are not fully utilized and precious metal substrates are insufficient are solved. The method comprises the following steps of: 1, preparing a graphene oxide aqueous solution; 2, preparing a hydrogen tetrachloroaurate hydrate aqueous solution, a sodium citrate aqueous solution and a silver nitrate solution; 3, preparing a graphene / gold composite material; 4, preparing a graphene / gold composite material suspension; and 5, erecting the treated substrate in the graphene / gold composite material suspension, and obtaining the graphene / gold surface-enhanced Raman spectrum substrate after the reaction is finished. According to the graphene / gold surface-enhanced Raman spectrum substrate, the repeated utilization of gold nanoparticles is improved, so that the cost is reduced, and the substrate has high enhancement of the surface Raman spectrum; and moreover, the method is applied to the field of chemical industry.

Description

technical field [0001] The invention relates to a preparation method of a surface-enhanced Raman spectrum substrate. Background technique [0002] In recent decades, the surface-enhanced Raman effect (SERS) has formed a very active research field in materials and analytical science, and it has made more and more progress in electrochemistry, biosensing technology, environmental analysis, and remote control. The more widely the application, so the preparation of a good active substrate is the key to obtain high-effect surface-enhanced Raman scattering. Currently, common SERS active systems include metal active electrodes, noble metal colloids, and metal active island membranes. Among them, the noble metal colloidal substrate has a lower production cost and a better enhancement effect, and has been widely studied and applied. The choice of precious metals generally includes Ag, Au, Cu, Fe, Ni, etc. Among them, Ag has the best reinforcement effect, but the chemical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/65
Inventor 孙立国曹晓俭郑梅青汪成张艳红
Owner HEILONGJIANG UNIV
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