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High-stability recyclable surface-enhanced Raman substrate and preparation method

A surface-enhanced Raman, high-stability technology, used in Raman scattering, gaseous chemical plating, superimposed layer plating, etc. Chemical stability and other issues, to achieve excellent performance stability and recycling function, good surface enhanced Raman effect, anti-oxidation effect

Inactive Publication Date: 2015-03-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to be based on highly sensitive surface-enhanced Raman substrates prepared from materials such as gold and silver. Because silver nanostructure substrates are prone to oxidation and vulcanization under atmospheric conditions, their poor chemical stability hinders the surface-enhanced Raman effect. Applications
At the same time, the traditional surface-enhanced Raman effect substrate does not have the ability to be recycled, the material utilization rate is low, and the detection cost is high, which greatly limits the further development of the surface-enhanced Raman effect.

Method used

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  • High-stability recyclable surface-enhanced Raman substrate and preparation method
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  • High-stability recyclable surface-enhanced Raman substrate and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Clean the silicon substrate or glass substrate sequentially with acetone, alcohol and deionized water and dry them;

[0019] 2. Fix the pretreated substrate on the sample stage of the electron beam evaporation coating machine;

[0020] 3. At room temperature, using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to a vacuum degree of 3×10 －5 Pa;

[0021] 4. Adjust the incident angle of the electron beam to 82 degrees, and make the sample stage static, and grow a silver nanorod thin film with a nanorod length of 300nm obliquely on the substrate of the sample stage;

[0022] 5. By atomic layer deposition, a uniform and dense titanium oxide film is deposited on a silver substrate at 82°C to prepare a silver-titanium oxide composite film, wherein the thickness of the titanium oxide film is 1.5nm;

[0023] 6. Preparation 10 -6 mol / L rhodamine 6G solution;

[0024] 7. Put the surface-enhanced Raman substrate pre...

Embodiment 2

[0029] 1. Clean the silicon substrate or glass substrate sequentially with acetone, alcohol and deionized water and dry them;

[0030] 2. Fix the pretreated substrate on the sample stage of the electron beam evaporation coating machine;

[0031] 3. At room temperature, using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to a vacuum degree of 5×10 －5 Pa;

[0032] 4. Adjust the incident angle of the electron beam to 85 degrees, and make the sample stage rotate at a rate of 5rpm, and grow a silver nanorod thin film with a nanorod length of 400nm on the substrate of the sample stage;

[0033] 5. By atomic layer deposition, a uniform and dense titanium oxide film is deposited on a silver substrate at 90°C to prepare a silver-titanium oxide composite film, wherein the thickness of the titanium oxide film is 2.3nm;

[0034] 6. Preparation 10 -6 mol / L rhodamine 6G solution;

[0035] 7. Put the surface-enhanced Raman subst...

Embodiment 3

[0040] 1. Clean the silicon wafer substrate or glass substrate sequentially with acetone, alcohol, and deionized water, and then dry it;

[0041] 2. Fix the pretreated substrate on the sample stage of the electron beam evaporation coating machine;

[0042] 3. At room temperature, using metallic silver as the target material, pump the chamber of the electron beam evaporation coating machine to a vacuum degree of 8×10 －5 Pa;

[0043] 4. Adjust the incident angle of the electron beam to 88 degrees, and make the sample stage rotate at a rate of 10rpm, and grow a silver nanorod thin film with a nanorod length of 500nm on the substrate of the sample stage;

[0044] 5. By atomic layer deposition, a uniform and dense titanium oxide film is deposited on a silver substrate at 100°C to prepare a silver-titanium oxide composite film, wherein the thickness of the titanium oxide film is 3.1nm;

[0045] 6. Preparation 10 -6 mol / L rhodamine 6G solution;

[0046] 7. Put the surface-enhance...

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Abstract

The invention realtes to a high-stability recyclable surface-enhanced Raman substrate and a preparation method and belongs to the technical field of trace-amount organic substance detection. In the method, a silver nanorod array thin film is prepared through an inclined growing method and then an amorphous-state titanium oxide thin film is uniformly deposited onto a surface of the silver nanorod array thin film through an atomic layer deposition method to obtain a silver-at-titanium oxide composite nanorod array thin film as the surface-enhanced Raman substrate. By means of the substrate, a surface-enhanced Raman signal is free from being attenuated greatly due to the ultrathin titanium oxide layer. The substrate is excellent in enhancement effect. Meanwhile, the titanium oxide thin film enables silver nanorods to be isolated from external environment so that the silver nanorods are enhanced in anti-oxidizing and anti-vulcanizing performance, thereby greatly enhancing stability of the substrate. The titanium oxide, as a photocatalytic material, can catalytically decomposing organic substances adsorbed on the surface of the substrate with combination of an ultraviolet light. The substrate, after being irradiated by the ultraviolet light, can be recycled as a clean substrate. The substrate has a wide application prospect in the field of the trace-amount organic substance detection.

Description

technical field [0001] The invention belongs to the technical field of trace organic matter detection, in particular to a high-stability recyclable surface-enhanced Raman effect substrate and a preparation method thereof. Background technique [0002] The surface-enhanced Raman effect is used in the trace detection of chemical and biological molecules, and has the advantages of high sensitivity, short detection time, low cost, and non-destructive analysis. This method needs to be based on highly sensitive surface-enhanced Raman substrates prepared from materials such as gold and silver. Because silver nanostructure substrates are prone to oxidation and vulcanization under atmospheric conditions, their poor chemical stability hinders the surface-enhanced Raman effect. Applications. At the same time, the traditional surface-enhanced Raman effect substrate does not have the ability to be recycled, the material utilization rate is low, and the detection cost is high, which grea...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C14/14C23C14/30C23C16/40G01N21/65
Inventor 张政军马菱薇
Owner TSINGHUA UNIV
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