Preparation method of gold nanometer triangular sheet with surface enhanced raman scattering

Abstract

The invention discloses a preparation method of a gold nanometer triangular sheet with a surface enhanced raman scattering. The preparation method comprises the following steps of taking a lithium niobate single crystal wafer as a substrate, and enabling the forward polarization surface of the substrate to face upwards, dropwise adding a chloroauric acid solution, and then irradiating the chloroauric acid solution by ultraviolet light to carry out a photochemical deposition reaction. The method has the beneficial effects that a brand-new method for preparing the SERS substrate with good performance is provided, namely the photochemical deposition reaction is adopted to prepare the gold nanometer triangular sheet; the method is simple and easy to operate, the experiment period is much shorter than the experiment period of a traditional chemical synthesis, the time is greatly saved, the size of the gold triangular sheet can be accurately controlled, the used lithium niobate single crystal wafer can be repeatedly used, and the service life is long, so that the experiment cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of molecular detection, in particular to a method for preparing a gold nano-triangular sheet with a surface-enhanced Raman effect. Background technique [0002] The Raman scattering spectrum is called the fingerprint of the substance. It can be used to identify the type of molecules and even the vibration information of the chemical bonds between molecules. However, the intensity of Raman scattered light is very weak, accounting for only 10% of the total scattered light intensity. -6 -10 -10 , it is difficult to obtain the Raman signal of the molecule. The study found that: surface-enhanced Raman scattering spectroscopy (SERS) is about adsorbing molecules on the surface of noble metal particles such as silver, gold or copper particles, or adsorbing on the rough surface of these metal sheets, the intensity of the Raman spectrum of the adsorbed sample can be increased by 10 3 -10 6 times. It is generally b...

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Problems solved by technology

The usual methods for preparing Raman scattering enhanced substrates include magnetron sputtering, chemical etching, and photolithography. Although these technologies have been developed relatively

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