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Recycling surface-reinforced Raman scattering substrate as well as preparation method and application

A surface-enhanced Raman and substrate technology, which is applied in the direction of Raman scattering, the process for producing decorative surface effects, and the manufacture of microstructure devices, can solve the problems of recyclable use and restrict wide application, and achieve recyclable use, Reduce costs and improve the effect of detection signals

Active Publication Date: 2015-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although various surface-enhanced Raman scattering substrates have been discovered, their recyclability is an important factor restricting their wide application.

Method used

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  • Recycling surface-reinforced Raman scattering substrate as well as preparation method and application
  • Recycling surface-reinforced Raman scattering substrate as well as preparation method and application
  • Recycling surface-reinforced Raman scattering substrate as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] according to figure 1 As shown in the flow chart, the titanium dioxide nanotube array film loaded with silver particles was prepared as a surface-enhanced Raman scattering substrate.

[0029] 1) Preparation of titanium dioxide nanotube substrate: anodic oxidation method is used, with Ti sheet as the anode and graphite as the cathode. Among them, the anodizing voltage is 30V; temperature: 20°C; anodizing time: 15min;

[0030] Electrolyte: 2.25g NH 4 F, 40ml H 2 O, 360ml ethylene glycol, 2ml concentration of 40.0wt% hydrofluoric acid; the obtained titanium dioxide nanotube array diameter is 50nm.

[0031] 2) Silver modification: plasma vacuum sputtering is used to sputter a layer of nano-silver particles with a thickness of 100 nm on the surface of titanium dioxide nanotubes under a vacuum of 6 Pa.

[0032] 3) Migration of silver: In humid air, silver migrates over time.

[0033] 4) Ultraviolet (UV) photoreduction: the sample that has undergone the silver migration p...

Embodiment 2

[0036] Surface-enhanced Raman scattering substrates were prepared according to the same method as in Example 1, and the anodic oxidation voltages for preparing the titanium dioxide nanotube substrates in Example 1 were changed to 20V, 30V, 40V, and 50V, respectively. Then, after sputtering a layer of nano-silver particles with a thickness of 100nm on the surface of titanium dioxide nanotubes, place them in a dark state and humid air for 10 days to completely migrate the silver. image 3 Shown is the result of migration of silver particles in nanotubes with different diameters. It can be seen that when the anodic oxidation voltage in (a) is low (20V), the diameter of nanotubes is smaller than that of nano-silver particles, so nano-silver particles adhere to the nanotubes. At the nozzle, the anodizing voltage in (b) is as low as 30V, and silver nanorods are formed in the nanotubes. The inner diameter of the nanotubes in (c) and (d) is relatively large, and the anodizing voltages ...

Embodiment 3

[0038] The titania nanotube array of loaded nano-silver particles prepared under different anodizing voltages described in Example 2 was prepared at 10 -6 M Rhodamine 6G (Rhodamine 6 G, R6G) was soaked in aqueous solution for 30 minutes, and the surface-enhanced Raman scattering signal was characterized by a 633nm laser Raman detector. The results are as follows Image 6 shown.

[0039] It can be clearly observed that the 636cm -1 is the characteristic peak of anatase, 616, 727, 1129, 1180, 1315, 1361, 1514, 1576, 1656cm -1 The Raman peak at is the characteristic peak of R6G.

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Abstract

The invention discloses a recycling surface-reinforced Raman scattering substrate as well as a preparation method and application, belonging to the technical field of material modification. The surface-reinforced Raman scattering substrate provided by the invention can be used for detecting low-concentration organic matters. According to the substrate, nano-silver particles are loaded in titanium dioxide nanotubes prepared by anodic oxidation; the morphologies of the nano-silver particles are controlled according to the sizes of the titanium dioxide nanotubes; and meanwhile, attached organic matters are decomposed by using the photocatalysis property of the titanium dioxide nanotubes under UV (Ultraviolet) light, and thus the aim of recycling is achieved. The preparation method disclosed by the invention has the advantages of low cost, low current and controllable morphologies of the nano-silver particles. The substrate obtained by the method has the characteristics of high stability, low detection concentration and recycling.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to a recycled surface-enhanced Raman scattering substrate and its preparation method and application. Background technique [0002] Since Fleischmann et al. discovered the surface Raman enhancement effect of pyridine on silver and copper in 1974, Raman spectroscopy has played an increasingly important role in molecular detection, including analytical chemistry, environmental science, and biological science. At present, the explanation mechanism of surface Raman enhancement mainly includes electromagnetic enhancement mechanism and chemical enhancement mechanism. The mechanism of electromagnetic enhancement believes that when the electromagnetic wave is incident on the metal surface, surface plasmon resonance occurs on the rough metal surface, which enhances the surface electric field, and the molecules close to the metal surface are affected by the strong el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B81C1/00
Inventor 凌云汉黄亮卓雨晴白新德
Owner TSINGHUA UNIV
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