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A single-layer nano-gold surface-enhanced Raman active substrate and preparation method thereof

A surface-enhanced Raman, active substrate technology, applied in Raman scattering, processes for producing decorative surface effects, coatings, etc. The preparation method is simple and feasible, the performance is excellent, and the effect is easy to use

Active Publication Date: 2016-11-23
INSPECTION & QUARANTINE TECH CENT OF FUJIAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sensitivity of conventional Raman spectroscopy is low, which once restricted the application field of Raman spectroscopy

Method used

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  • A single-layer nano-gold surface-enhanced Raman active substrate and preparation method thereof
  • A single-layer nano-gold surface-enhanced Raman active substrate and preparation method thereof
  • A single-layer nano-gold surface-enhanced Raman active substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Soak, wash and dry all glassware with aqua regia before use.

[0027] Synthesis of nano-gold sol: add 1 mL of 1% chloroauric acid solution to 100 mL of pure water, heat the solution to reflux to boiling, quickly add 1 mL of 1% sodium citrate solution under vigorous stirring, and react for 1 min, visible The color of the solution changed from light yellow to black, and then quickly turned to brown red. At this time, the reaction stopped after boiling slightly for 30 minutes. Take it out and stir it at room temperature and cool it down to room temperature to obtain nano-gold sol. This nano-gold sol should be stored in a refrigerator at 4°C. Light can be stored for at least 4 months.

[0028] Preparation of single-layer nano-gold surface-enhanced Raman active substrate: Oxidize the surface of single crystal silicon with a mixed solution of concentrated sulfuric acid and hydrogen peroxide (concentrated sulfuric acid: hydrogen peroxide = 4:1, V / V) for 48 hours to make the su...

Embodiment 2

[0031] Soak, wash and dry all glassware with aqua regia before use.

[0032] The synthesis of nano-gold sol: add 0.5wt% chloroauric acid solution 2mL in 100 mL pure water, the solution is heated and refluxed to boiling, and 0.5 mL of 2wt% sodium citrate solution is added rapidly under vigorous stirring, and the solution color changes from light yellow to It turns black, and then quickly turns brown-red. At this time, the reaction stops after boiling for 50 minutes. Take it out and stir it at room temperature and cool it down to room temperature to obtain nano-gold sol. This nano-gold sol can be stored at least 4 pieces in a refrigerator at 4°C and protected from light. moon.

[0033] Preparation of single-layer nano-gold surface-enhanced Raman active substrate: Oxidize the surface of single crystal silicon with a mixed solution of concentrated sulfuric acid and hydrogen peroxide (concentrated sulfuric acid:hydrogen peroxide = 4:1, V / V) for 60 h to make the surface of the silic...

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Abstract

The invention discloses a single-layer nano-gold surface-enhanced Raman active substrate and a preparation method thereof. The preparation method is as follows: the surface of a single crystal silicon is oxidized by a mixed solution of concentrated sulfuric acid and hydrogen peroxide, and immersed in cetyltrimethylammonium bromide In the aqueous solution, stand still for 18-30 h to obtain a silicon wafer with a bimolecular layer assembled on the surface; then immerse the silicon wafer in the nano-gold sol, let it stand for 18-30 h, and then dry the silicon wafer at room temperature to obtain Monolayer gold nanosurface enhanced Raman active substrate. The preparation method is simple and easy to use. The single-layer nano-gold surface-enhanced Raman active substrate prepared by the invention has excellent performance, strong signal amplification capability and can be used repeatedly.

Description

technical field [0001] The invention specifically relates to a single-layer nano-gold surface Raman-enhanced active substrate for Raman spectrum detection and a preparation method thereof. Background technique [0002] Raman spectroscopy can provide fingerprint information of chemical and biomolecular structures and is a widely used non-destructive testing technique. However, the sensitivity of conventional Raman spectroscopy is low, which once restricted the application field of Raman spectroscopy. In the 1970s, the phenomenon of surface-enhanced Raman scattering (SERS) was discovered, that is, due to the adsorption of molecules and other species on or very close to the surface with a certain nanostructure, the Raman signal is significantly enhanced compared to its bulk molecules. With the rapid development of nanotechnology, new vitality has been injected into SERS, and some nanoparticle systems can even amplify the sensitivity of Raman spectroscopy by tens of billions of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B81C1/00
Inventor 杨方刘琼华陈旭东许雪琴邱彬林振宇
Owner INSPECTION & QUARANTINE TECH CENT OF FUJIAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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