Surface enhanced Raman scattering substrate, preparation method therefor and application thereof

Abstract

The invention discloses a ZnO-Ag surface enhanced Raman scattering substrate and detection of organic pollutants with the substrate. The preparation method for the substrate comprises the following steps: the first step, ITO conductive glass is subjected to ultrasonic cleaning with acetone, alcohol and deionized water one by one and dried in the air; the second step, organic additives are added in a zinc nitrate solution, a first mixed liquid is formed, after the first mixed liquid is stirred for 30 min, an ammonia-water solution with a mass fraction of 25% is dropwisely added in the first mixed liquid, a second mixed liquid is formed, the processed ITO conductive glass from the first step is soaked in the second mixed liquid, after the water bath is at a constant temperature, the ITO conductive glass is placed in a baking box and baked for 60-100 min, a white and uniform ZnO layer is formed on the surface of the ITO conductive glass; the third step, Ag nanoparticles are deposited on the prepared ZnO nanolayer from the second step, and a ZnO-Ag surface enhanced Raman scattering substrate is obtained. The preparation method is simple. The prepared substrate has high sensitivity and good stability and can be used repeatedly.

Description

technical field [0001] The invention relates to a surface-enhanced Raman scattering substrate, a preparation method and application thereof. Background technique [0002] Raman spectroscopy, as a fingerprint spectrum to characterize molecular vibrational energy levels, has been widely used in various fields, but its signal is weak and easily overwhelmed by background fluorescence. For the detection and characterization of samples in trace states, surface-enhanced Raman spectroscopy with surface selectivity is required. Surface-enhanced Raman scattering (Surface-enhanced Raman Scattering, SERS) Chemistry, physics, biology, medicine, environmental monitoring, public safety and other aspects have been applied to a certain extent. SERS is an abnormal optical enhancement phenomenon of nanoscale rough surfaces or particle systems, and the signal enhancement can be as high as 10 6 times, for the surface of the substrate with special nanoscale particle morphology distribution, the ...

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Problems solved by technology

However, most of the current SERS substrate materials are noble metal nano-gold, silver or copper, which are expensive and not conducive to practical applications. For example, composite materials prepared by doping other materials, such as metal semiconductors as the basic framework, compound modification Noble metals, building semiconductor-noble metal hybrid composites

Many studies have shown that when the semiconductor-noble metal hybrid composite material is used as the SERS substrate, the two have a synergistic enhancement effect, which can obtain a higher enhancement effect than a single metal material. At the same time, the photocatalytic degradation function of the semiconductor metal and the silver nanoparticle The Raman enhancement effect can make the substrate have multiple functions such as high sensitivity and self-cleaning recycling, and can be used as a multifunctional surface-enhanced Raman scattering substrate. However, the preparation process of the currently reported SERS substrate is complicated and the required equipment is expensive. , and cannot be reused, it will cause waste of energy resources, and there is still a certain gap from practical application. Although the SERS substrate with high enhancement effect is the goal pursued by scientific research, it is more practical and cheap to obtain a The SERS substrate is particularly important

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