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CN-122016756-A - Multicolor electrochromic SERS substrate and preparation method and application thereof

CN122016756ACN 122016756 ACN122016756 ACN 122016756ACN-122016756-A

Abstract

The invention belongs to the technical field of laser Raman spectrum detection, and relates to a multicolor electrochromic SERS substrate, a preparation method and application thereof, wherein the method takes vanadium pentoxide powder as a raw material, the vanadium pentoxide nanobelt is synthesized by a simple solvent treatment method, and the multicolor vanadium oxide electrochromic SERS film substrate is prepared by adopting a spray processing technology. Multicolor vanadium oxide electrochromic SERS substrates have electrochromic and SERS effects that are accompanied by charge transfer, charge density, and band gap width variations during electrochromic processes that can significantly alter their SERS properties. The color, transmittance, band gap and detection performance of the light-emitting diode can be accurately, reversibly and visually controlled by changing the applied potential. The color of the multicolor electrochromic SERS substrate has strong correlation with the SERS detection performance, the SERS detection performance and the molecular selectivity can be judged through color change, and the color change method has great significance for trace detection of molecules to be detected.

Inventors

  • ZHANG SIHANG
  • Ao jie
  • WU LONG
  • CHEN YING
  • XU JIECHEN
  • CHEN YUJUN
  • LI ZIYANG

Assignees

  • 海南大学

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. A method for preparing a multicolor electrochromic SERS substrate, comprising the steps of: Adding the ground vanadium pentoxide powder into a sodium nitrate solution, reacting for 5-15 days at 25-75 ℃ to obtain a vanadium pentoxide dispersion liquid, and washing the vanadium pentoxide dispersion liquid with deionized water for multiple times to obtain a vanadium pentoxide nanobelt dispersion liquid, wherein the mass ratio of the vanadium pentoxide powder to sodium nitrate in the sodium nitrate solution is 1:10-20, the molar concentration of the sodium nitrate solution is 0.5-2 mol/L, and the mass fraction of the vanadium pentoxide nanobelt in the vanadium pentoxide nanobelt dispersion liquid is 0.2-1.0%; uniformly spraying the vanadium pentoxide nanobelt dispersion liquid on the surface of the heated conductive glass, and volatilizing a solvent in the vanadium pentoxide nanobelt dispersion liquid sprayed on the surface of the conductive glass to obtain a vanadium pentoxide nanobelt film, thereby obtaining the multicolor electrochromic SERS substrate.
  2. 2. The method for preparing a multicolor electrochromic SERS substrate according to claim 1, wherein a mass ratio of the vanadium pentoxide powder to sodium nitrate in sodium nitrate solution is 1:12.75.
  3. 3. The method of preparing a multicolor electrochromic SERS substrate according to claim 1, wherein the sodium nitrate solution has a molar solubility of 1.5mol/L.
  4. 4. The method for preparing a multicolor electrochromic SERS substrate according to claim 1, wherein the mass fraction of vanadium pentoxide nanoribbons in the dispersion of vanadium pentoxide nanoribbons is 0.2%.
  5. 5. The method for preparing a multicolor electrochromic SERS substrate according to claim 1, wherein the aspect ratio of the vanadium pentoxide nanobelts in the vanadium pentoxide nanobelt dispersion is 100-1000.
  6. 6. The method for preparing a multicolor electrochromic SERS substrate according to claim 1, wherein the thickness of the vanadium pentoxide nanoribbon film is 100-800 nm.
  7. 7. The method for preparing the multicolor electrochromic SERS substrate according to claim 1, wherein the heating temperature of the conductive glass is 80-150 ℃, the spraying distance of the vanadium pentoxide nanobelt dispersion liquid on the surface of the conductive glass is 10-30 cm, and the spraying time is 1-5 min.
  8. 8. The multi-color electrochromic SERS substrate prepared by the method for preparing a multi-color electrochromic SERS substrate according to any one of claims 1 to 7.
  9. 9. The multi-color electrochromic SERS substrate of claim 8, wherein the multi-color electrochromic SERS substrate has electrochromic and SERS effects capable of multi-color electrochromic functions at different voltages, SERS detection performance and molecular selectivity determined by color change.
  10. 10. Use of a polychromatic electrochromic SERS substrate according to claim 8 in dye methylene blue identification detection.

Description

Multicolor electrochromic SERS substrate and preparation method and application thereof Technical Field The invention belongs to the technical field of electrochromic and surface-enhanced Raman spectrum detection, and particularly relates to a multicolor electrochromic SERS substrate, a preparation method and application. Background Typically, the signal measured by conventional raman spectroscopy is weak and can only be measured in solid samples and in highly concentrated solutions. While Surface Enhanced Raman Scattering (SERS) generally refers to the phenomenon in which the raman signal of a target molecule is significantly enhanced when it is adsorbed onto a roughened noble metal surface. Compared with the traditional Raman spectrum, the signal enhancement factor of the surface enhanced Raman spectrum can reach 10 12 or even higher. The detection sensitivity can even reach the single molecular level. The SERS detection technology has the advantages of simplicity in operation, high sensitivity, no need of sample pretreatment, rapidness, no damage and the like. In addition, SERS substrates are capable of detecting all types of analytes, including solids, liquids, and gases. As a novel and powerful spectrum detection technology, SERS spectrum is widely applied to the fields of food safety detection, environmental pollutant monitoring, disease diagnosis, cultural relic identification, chemical reaction analysis and the like. However, in the prior art, the active substrate on which SERS detection depends is still a noble metal SERS active substrate prepared mainly from conventional noble metals such as gold, silver, copper, etc., and the enhancement effect is mainly from plasmon resonance of noble metal materials in the noble metal SERS active substrate. The noble metal SERS active substrate has the problems of high cost, poor stability (easy oxidation) and limited spectrum range although the enhancement effect (enhancement capability) is extremely strong. In order to solve the problems of the conventional noble metal SERS active substrate, in recent years, a semiconductor SERS substrate which has the advantages of low cost, good compatibility, adjustable structure, difficulty in inducing side reactions (the difficulty in inducing side reactions is the defect of overcoming noble metal oxidation, namely, good stability) and the like is adopted to become a development trend. For example, the vanadium oxide SERS substrate is prepared by an annealing method or a doping method, however, the annealing method or the doping method for preparing the vanadium oxide SERS substrate generally has the problems of complex process and incapability of accurately controlling SERS performance. Therefore, the preparation method of the multi-color electrochromic SERS substrate, which has simple process and can realize accurate control of SERS performance, has very important significance. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a multicolor electrochromic SERS substrate, a preparation method and application, wherein the method has simple process and realizes accurate control of SERS performance, in the preparation method, vanadium pentoxide powder is used as a raw material, a vanadium pentoxide nanobelt is synthesized by a simple solvent treatment method, and a spray processing technology is adopted to prepare the multicolor electrochromic SERS film substrate. And because the color of the multicolor electrochromic SERS substrate has strong correlation with the SERS detection performance, the SERS detection performance and the molecular selectivity of the multicolor electrochromic SERS substrate can be judged through color change, and the multicolor electrochromic SERS substrate has great significance for trace detection of molecules to be detected. In order to solve the technical problems, the invention provides a preparation method of a multicolor electrochromic SERS substrate, which comprises the following steps: Adding the ground vanadium pentoxide powder into a sodium nitrate solution, reacting for 5-15 days at 25-75 ℃ to obtain a vanadium pentoxide dispersion liquid, and washing the vanadium pentoxide dispersion liquid with deionized water for multiple times to obtain a vanadium pentoxide nanobelt dispersion liquid, wherein the mass ratio of the vanadium pentoxide powder to sodium nitrate in the sodium nitrate solution is 1:10-20, the molar concentration of the sodium nitrate solution is 0.5-2 mol/L, and the mass fraction of the vanadium pentoxide nanobelt in the vanadium pentoxide nanobelt dispersion liquid is 0.2-1.0%; uniformly spraying the vanadium pentoxide nanobelt dispersion liquid on the surface of the heated conductive glass, and volatilizing a solvent in the vanadium pentoxide nanobelt dispersion liquid sprayed on the surface of the conductive glass to obtain a vanadium pentoxide nanobelt film, thereby obtaining the multicolor electrochromic SERS substrate. Limi