Preparing method and application of photoinduced enhanced Raman substrate based on TiO2/Ag nanoarray

Abstract

The invention relates to the field of Raman spectrum analysis, and particularly relates to a preparing method and application of a photoinduced enhanced Raman substrate based on TiO2 / Ag nanoarray. A semiconductor-precious metal composite substrate is adopted, photoinduction of the semiconductor is utilized to enhance SERS performance of the substrate, and photocatalysis performance of the semiconductor is utilized to degrade probe molecules, thus achieving the repeated utilization rate of the substrate. In addition, a graphene layer is composited on the substrate to enhance repeatability of the substrate, enhance SERS performance of the substrate and achieve repeated utilization of the substrate. A three-dimensional nanoarray structure increases the area of the SERS active substrate underthe premise of not increasing the total area. In addition, laser excitation and Raman scattering have certain penetrating depth, and the three-dimensional structure can increase the volume of laser-sample interaction without the need of increasing the size of the SERS substrate or laser intensity. The sensitivity of the SERS substrate is improved, thus providing a good route for future biologicaldetection.

Description

technical field [0001] The invention relates to the field of Raman spectroscopic analysis, in particular to a TiO-based 2 Preparation method and application of light-induced enhanced Raman substrate of / Ag nano-array. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS), as a powerful and versatile new analysis tool, can be used for single-molecule detection or multi-molecule tracking due to its superior sensitivity. The preparation of SERS substrates has always been a hot spot in SERS research. Factors such as substrate material selection and surface morphology can significantly affect the signal intensity and repeatability of the spectrum, which determines the application of SERS detection method in real life. The main principle of preparing SERS substrates is to improve sensitivity, stability and repeatability, and reduce costs and be environmentally friendly. In recent years, reusable SERS substrates have been the goal that experimenters have been p...

AI Technical Summary

Problems solved by technology

So far, SERS detection has mainly used noble metals (Au, Ag) as the detection substrate, which has great limitations and is expensive, and it is difficult to prepare a substrate with excellent circulation

The purpose of the present invention is to find a substrate that can replace the current mainstream precious metal substrate, thereby solving the problem of high cost, improving the repeated utilization rate, and realizing the purpose of actual detection

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