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A Highly Stable Polarization-Independent Surface-Enhanced Raman Scattering Substrate, Its Preparation and Application

A surface-enhanced Raman, high-stability technology, applied in the fields of material physical chemistry and ionic science, can solve the problems of inability to identify nanoscale structures, signal output uncertainty, uncertainty, etc., and achieve a wide range of excitation electromagnetic wave wavelength adaptation. effect of good physical and chemical stability

Active Publication Date: 2017-10-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This ubiquitous large defect makes the signal output of today's surface-enhanced Raman substrates extremely uncertain, unreliable and low-reproducible
Especially in the actual production and life testing sites outside the laboratory, it is impossible to identify the optimal localized surface plasmon oscillation excitation direction of the nanoscale structure, let alone the relationship between the electric field polarization direction of the excitation light and the optimal nanostructure. Optimum Excitation Direction for Matching
Therefore, due to the polarization-dependent optical properties of the existing noble metal nanostructures, the surface-enhanced Raman scattering signal excited by the substrate has a fatal flaw of great uncertainty, unreliability and low reproducibility. As a result, surface-enhanced Raman scattering technology has not been widely used in actual production and life.

Method used

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  • A Highly Stable Polarization-Independent Surface-Enhanced Raman Scattering Substrate, Its Preparation and Application
  • A Highly Stable Polarization-Independent Surface-Enhanced Raman Scattering Substrate, Its Preparation and Application
  • A Highly Stable Polarization-Independent Surface-Enhanced Raman Scattering Substrate, Its Preparation and Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A high-purity aluminum sheet with a purity of 99.9995% and a thickness of 0.3 mm is selected as the substrate. First, the high-purity aluminum sheet, which is smooth and flat, without obvious damage on the surface, is annealed at a temperature of 400° C. for 12 hours. Then immerse the annealed high-purity aluminum sheet in an acetone solution and ultrasonically clean it for 5 minutes. The cleaned and dried high-purity aluminum sheet is used as the anode, and the platinum sheet is used as the cathode, and they are immersed in the mixed polishing solution of perchloric acid and ethanol with a volume ratio of 1:5, and the surface of the aluminum sheet is subjected to 3 minute electrochemical polishing. The electrochemically polished aluminum sheet is used as the anode, and the platinum sheet is used as the cathode. As for the molar concentration of 0.4mol / L oxalic acid distilled aqueous solution, the surface of the high-purity aluminum sheet is anodized under 40V DC const...

Embodiment 2

[0048] For the non-polarization-dependent surface-enhanced Raman scattering substrate with high physical and chemical stability obtained in Example 1, the surface-enhanced Raman scattering detection is performed when the incident light adopts a 0° (180°) electric field polarization direction. Figure 6 The 10 -5 Surface-enhanced Raman scattering spectrum of mol / L crystal violet solution. From the enhanced Raman spectrum, the Raman characteristic peaks of crystal violet can be clearly seen, indicating that the periodic array of equilateral triangular trimers of gold nanoparticles has a good surface-enhanced Raman in the 0° (180°) electric field polarization direction. Mann scattering effect.

Embodiment 3

[0050] For the non-polarization-dependent surface-enhanced Raman scattering substrate with high physical and chemical stability obtained in Example 1, the surface-enhanced Raman scattering detection is performed when the incident light adopts a 45° (225°) electric field polarization direction. Figure 7 The 10 -5 Surface-enhanced Raman scattering spectrum of mol / L crystal violet solution. From the enhanced Raman spectrum, the Raman characteristic peaks of crystal violet can be clearly seen, indicating that the periodic array of equilateral triangular trimers of gold nanoparticles has a good surface-enhanced Raman in the 45° (225°) electric field polarization direction. Mann scattering effect.

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Abstract

Provided are a high-stability, non-polarisation-dependent, surface-enhanced Raman scattering substrate, and the preparation and use thereof, wherein the preparation technique belongs to the field of material physical chemistry, the use thereof belongs to the fields of light scattering science and surface plasma science, and the substrate is a regular array formed by an equilateral trimer of gold nano-particles in a periodic arrangement. The preparation process involves: firstly, preparing, on an aluminium substrate, a layer of a periodic array of extremely thin alumina nano pit equilateral trimers by means of electrochemical corrosion; then, depositing a layer of extremely thin gold nano-film on the array; and then, annealing the nano pit array substrate with the gold film deposited thereon to obtain a gold nano-particle equilateral trimer periodic array, i.e. the high-stability, non-polarisation-dependent, surface-enhanced Raman scattering substrate. The substrate has the prominent advantage of all-angle stable output of a surface-enhanced Raman scattering signal within a full range of 360¡ã independent of an excitation light polarisation direction during the process of surface-enhanced Raman scattering detection.

Description

technical field [0001] The invention relates to a high-stability non-polarization-dependent surface-enhanced Raman scattering substrate, preparation technology and application. The preparation technology belongs to the field of material physics and chemistry, and the application field belongs to the fields of light scattering science and surface plasmon science. technical background [0002] The surface-enhanced Raman scattering (SERS) effect is a high-sensitivity trace analysis and detection technology that can amplify the molecular light scattering signal by at least a million times, and its extreme detection ability can even realize the detection and identification of single molecules. Great scientific research significance, wide-ranging practical application prospects and potential high commercial value. The mechanism is derived from the extremely strong localized surface plasmon oscillations generated when the noble metal nanostructures are excited by external electroma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C23C14/35C23C28/00
CPCC23C14/35C23C28/40C25D11/04C23C28/00G01N21/65
Inventor 蒋毅坚冯超赵艳
Owner BEIJING UNIV OF TECH
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