SERS substrate and preparation method thereof

Abstract

The invention provides an SERS substrate and a preparation method thereof, and relates to the technical field of Raman spectra. The method comprises the steps that S0, a substrate is sequentially subjected to cleaning and hydrophilic treatment; S1, monodispersed nanoballs or nanocrystallines or quantum dots are adopted, and at least one layer of regularly-arranged self-assembly array structure is formed on the surface of the substrate; S2, a metal active layer is deposited at the top of the self-assembly array structure; and S3, the metal active layer is covered with a carbon-based nano-material layer to obtain the SERS substrate. According to the SERS substrate and the preparation method thereof, the metal active layer is deposited on the large-area regularly-arranged self-assembly array structure, a periodic metal nanostructure can be formed without annealing, then the metal active layer is covered with the carbon-based nano-material layer so that the metal nanostructure can be isolated from air to avoid or slow down the oxidization process of the metal nanostructure, and then the SERS substrate has quite high sensitivity and can maintain long activity.

Description

technical field [0001] The invention relates to the technical field of Raman spectroscopy, and more specifically, to a SERS substrate and a preparation method thereof. Background technique [0002] Raman spectroscopy is a spectroscopic method used to study molecular vibrations. With the help of spectral analysis, the characteristic peaks related to molecular vibrations can be obtained, so as to obtain key information about the composition and structure of probe molecules. Therefore, it is an important detection and analysis method. technology. However, in traditional Raman spectroscopy detection, the Raman signal intensity of probe molecules is too weak, which greatly restricts the application range of Raman detection technology. In 1974, Fleischmann et al. first obtained the greatly enhanced Raman scattering signal of pyridine molecules on the surface of a rough metallic silver electrode (Fleischmann et al.Raman spectrum of pyridineadsorbed at a silver electrode.Chemical P...

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Problems solved by technology

[0004] However, metals such as silver, titanium, bismuth, and copper have strong activity and are easily oxidized when exposed to air. The activity of using these metals to prepare metal nanostructures and corresponding SERS substrates will be weakened or even invalidated with metal oxidation.

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