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

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...

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