Preparation method of nano-porous silver-based substrate with Raman signal enhancing function on surface

Abstract

The invention discloses a preparation method of a nano-porous silver-based substrate with a Raman signal enhancing function on the surface, and belongs to the technical field of material preparation. The preparation method comprises the following steps: after the surface of the silver-based substrate is pretreated, soaking the silver-based substrate in an alkaline solution, and preparing the nano-porous silver-based substrate on the surface of the substrate through an electrochemical oxidation-reduction method. According to the preparation method, the silver-based substrate is added into the alkaline solution, and in-situ oxidation and reduction of metallic silver are achieved by controlling the electrochemical oxidation-reduction potential; and a uniform and stable nano-porous structure is obtained on the surface of the silver-based substrate through the crystal lattice size difference of silver oxide and the metallic silver, and thus Raman signals can be effectively enhanced. The nano-porous silver-based substrate material prepared through the method has the advantages that the operation method is simple, the reaction conditions are mild and controllable, raw materials are cheap and easy to obtain, reaction energy consumption is low, no additive is needed, pollution is avoided, the product quality is stable, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a nanoporous silver-based substrate whose surface has the function of enhancing Raman signals. Background technique [0002] Trace molecular detection has been widely used in environmental monitoring, food safety, disease detection, cell detection and forensic identification. However, the detection of trace molecules is difficult to achieve, and there are problems such as high technical difficulty, high detection cost, slow detection speed, low detection efficiency, and low repeatability. Surface-enhanced Raman scattering (SERS) technology has been applied to physical property detection and trace molecular detection with low detection limit and rich molecular structure information. Certain metal nanostructure materials have strong localized surface plasmon resonance (LSPR) properties in the visible and near-infrared bands, which ca...

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Problems solved by technology

However, these methods usually require high temperature, high pressure, strong acid, strong alkali environment

In addition, these preparation processes not only require the assistance of large-scale equipment, but also the process is cumbersome, which is not conducive to large-scale production, but also has high energy consumption and heavy pollution, which is extremely unfavorable to the environment.

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