A kind of SERS substrate and preparation method based on rebco template

Abstract

The invention discloses an SERS substrate based on an REBCO template and a preparation method of the SERS substrate. The SERS substrate comprises an REBCO template layer and a metal modification layer, wherein the outer surface of the REBCO template layer is plated with the metal modification layer. The thickness of the REBCO template layer is continuously adjustable between 10 nm and 2,000 nm, and the structure is from an amorphous structure to a polycrystalline structure and can be freely adjusted in the a-axis and b-axis orientation and the c-axis orientation or the mixed orientation. The metal modification layer is a metal thin film or a metal particle layer. The thickness of the metal modification layer ranges from 5 nm to 200 nm. Compared with the prior art, the substrate and the preparation method of the substrate have the beneficial effects that the SERS substrate prepared through the method is good in uniformity and high in sensitivity, has the metal flexibility character and can meet multiple application needs; the REBCO growth mechanism and growth method are greatly studied, and industrial production under precise control can be achieved easily; and meanwhile the preparation method is simple, experiment parameters in the growth process are easier to control than those in a chemical method, and the industrial preparation cost can be lower than 0.5 dollar / cm<2>.

Description

Technical field [0001] The invention relates to a SERS substrate based on a REBCO template and a preparation method thereof, that is, a SERS substrate prepared by using a rare earth oxide coating conductor as a template and a preparation method thereof, and in particular to the use of pulsed laser deposition technology (hereinafter referred to as PLD) And chemical methods to prepare rare earth oxide (hereinafter referred to as REBCO, RE = rare earth element) coatings with certain orientation and defects, and then use this as a template to prepare on a flexible substrate with good uniformity, obvious enhancement effect, low cost and repeatability Strong SERS basis method. Background technique [0002] Surface Enhanced Raman Spectroscopy (SERS) is a very powerful and highly sensitive analytical technique that can detect and analyze various molecules adsorbed on the surface of a substance. For some systems, its sensitivity can even reach the level of detecting single molecules. Aft...

AI Technical Summary

Problems solved by technology

Generally speaking, the bottom-up method is based on the chemical synthesis of nanoparticles such as gold and silver. Although this method is simple and easy to synthesize, it has great disadvantages, including: 1. Nanoparticles synthesized by solution method The prepared SERS substrate, in fact, only a small part of the particles have SERS activity, and other nanoparticles cover the surface of the substrate to inhibit the SERS detection effect

2. It is difficult to control the aggregation effect of nanoparticles prepared from solution, which will inevitably affect the stability and repeatability of SERS detection results

3. It is particularly important that the method for controlling the synthesis of stable nano-SERS active hotspots is still immature, that is to say, the control of synthesizing nanostructures with specific morphology still has a certain degree of randomness

The main disadvantages of this type of substrate are: 1. It is difficult to completely control the substrate with such a large surface area technically, which may lead to inconsistent surface morphology between different batches of substrates

2. Usually this kind of substrate has poor mechanical properties, especially poor flexibility and easy to break

However, when preparing high-temperature superconducting coated conductors, when CeO 2 When the thickness of the buffer layer exceeds a certain value (about 50nm) on the metal substrate, microcracks will appear

The appearance of micro-cracks in turn affects the epitaxial growth of the superconducting layer on the buffer layer

In addition, REBCO itself is extremely sensitive to growth conditions due to its complex structure

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