The purposes of a kind of composite sers substrate in detection malachite green

Abstract

The invention provides a method for preparing an AgVO3 nanobelt / Ag nanoparticles composite SERS substrate, and provides the composite SERS substrate, which comprises a nanobelt and metal nanoparticles, wherein the nanobelt is AgVO3, and the Ag nanoparticles are absorbed on the surface. The composite SERS substrate preparation method comprises the following steps: 1) preparing the AgVO3 nanobelt; 2) taking the AgVO3 nanobelt and performing ultrasonic dispersion on the AgVO3 nanobelt in an aqueous solution containing a reducing agent, stirring the materials for 1-12 hours; and 3) centrifuging the nanobelt and re-performing ultrasonic dispersion on an AgVO3 solution, standing for 12-24 hours to obtain the product. Compared with the powder SERS substrate, the position and the relative distance of the Ag nanoparticles in an AgVO3 / Ag nano compound are fixed, aggregation phenomenon is not generated, the activity can be kept; compared with a laser etched substrate, the substrate preparation method has the advantages of simpleness, easy acquisition, no requirement of special equipment, and easy popularization.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and food safety monitoring, and in particular relates to the application of a composite SERS substrate in detecting malachite green. Background technique [0002] "Food is the most important thing for the people, and food safety is the first priority." Food safety issues are related to the vital interests of the people. Since the reform and opening up, my country's food industry has developed rapidly. In my country's national economy, the food industry has become the largest industry. The total amount of food has increased steadily, and the types of food have become increasingly diversified. However, the continuous series of vicious food safety incidents have made people tremble with fear and make food unsafe, seriously affecting the people's sense of happiness and security, and also damaging the government's credibility. This has prompted the country to continuously increase food...

AI Technical Summary

Problems solved by technology

[0004] The prerequisite for the wide application of SERS technology is the preparation of nano-substrates with good selectivity and high sensitivity. Traditional SERS nano-substrates are nano-powders or sols of currency metals. Although they can fully contact with target molecules, they cannot form SERS hot spots. It is not conducive to obtain the best detection effect from the perspective of

This is because the formation of hot spots requires the distance between nanoparticles to be less than 10 nanometers, but the distance between free particles is difficult to control so accurately, so many reports have been obtained on arrayed SERS substrates using laser etching methods, but these The method requires precise preparation equipment, and the production cost is relatively high

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