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Surface-enhanced Raman spectrum substrate, and preparation method thereof

A surface-enhanced Raman and substrate technology, applied in the field of molecular spectroscopic analysis and detection, can solve the problems of difficult to adapt to mass production, long production cycle, high cost, and achieve ultra-high analytical sensitivity, good enhancement effect, and short production cycle.

Active Publication Date: 2012-10-17
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned structure of the prior art needs to grow the matrix on the surface of the solid base material, which has the disadvantages of high cost, long production cycle, and difficulty in adapting to mass production; and the solid base material is hard and brittle, easy to damage, and does not have the ability to adapt to environmental conditions when used. Adapt to the characteristics of orientation

Method used

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  • Surface-enhanced Raman spectrum substrate, and preparation method thereof
  • Surface-enhanced Raman spectrum substrate, and preparation method thereof
  • Surface-enhanced Raman spectrum substrate, and preparation method thereof

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Embodiment 1

[0055] Embodiment 1, the present invention also discloses a method for preparing a SERS substrate, comprising the following steps:

[0056] a. At least the surface of the base layer 1 with a surface roughness similar to metallographic sandpaper is cleaned in an organic solvent; in this embodiment, the metallographic sandpaper is cleaned in an organic solvent, and the organic solvent is ethanol or acetone, and this embodiment uses Ethanol; metallographic sandpaper adopts 3000 order, also adopts 180 order, 400 order and 5000 order sandpaper to test simultaneously in the present embodiment, and gained result is slightly worse than 3000 order effect;

[0057] b. Evaporate a noble metal layer 2 on the surface of the base layer 1 with a surface roughness similar to that of metallographic sandpaper; in this embodiment, the noble metal is silver, and the evaporation thickness is 20-400nm, preferably 120nm, which saves materials and can reach intended purpose;

Embodiment 2

[0058] Embodiment 2, the present invention also discloses a method for preparing a SERS substrate, which includes the following steps:

[0059] a. At least base layer 1 has the surface of the surface roughness similar to metallographic sandpaper to be cleaned in an organic solvent; the base layer of this embodiment adopts metallographic sandpaper, and the organic solvent is ethanol or acetone, and the present embodiment adopts ethanol; metallographic sandpaper Adopt 3000 mesh; Also adopt 180 mesh, 400 mesh and 5000 mesh sandpaper to test simultaneously in the present embodiment, gained result is slightly worse than 3000 mesh than effect;

[0060] b. Place the base layer 1 on the spin coater. In this embodiment, the metallographic sandpaper is cut into a size of 1 × 1 inch, and the speed of the spin coater is set between 500-3000 revolutions. This speed range can be adapted to metallographic The precious metal layer is coated on the sandpaper, too high or too low can not be eve...

Embodiment 3

[0067] Embodiment 3, the present invention also discloses a method for preparing a surface-enhanced Raman substrate, which includes the following steps:

[0068] a. At least the base layer has the surface roughness similar to the metallographic sandpaper to be cleaned in an organic solvent; the base layer of this embodiment adopts metallographic sandpaper, and the organic solvent is ethanol or acetone, and the present embodiment adopts ethanol; the metallographic sandpaper adopts 3000 orders; Also adopt 180 orders, 400 orders and 5000 orders sandpaper to test in the present embodiment simultaneously, and gained result is slightly worse than 3000 orders than effect;

[0069] b. Spray the precious metal salt solution on the surface of the base layer with a surface roughness similar to metallographic sandpaper (metallographic sandpaper surface), and spray the reducing solution, wait for 1-5min, the waiting time is 1min, 3min and 5min respectively, the experimental results There i...

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Abstract

The invention discloses a surface-enhanced Raman spectrum (SERS) substrate, and a preparation method thereof. The substrate comprises a flexible base layer and a noble metal layer. At least one face of the flexible base layer has a surface roughness like that of metallographic abrasive paper, and the noble metal layer is adhered to the flexible base layer, wherein the noble metal layer is formed by one or more materials selected from gold, solver, and copper. According to the invention, a noble metal surface with micrometer and nanometer double-roughness is directly formed on the base layer. The SERS substrate has ultra-high analytic sensitivity which is suitable for detections of ultra-trace samples, and has advantages of good reproducibility, simple production, short period, low cost, and suitability for batch productions. Therefore, the substrate and method provided by the invention can be widely applied in fields of homeland security, environmental monitoring, food safety, medical and health care, and the like.

Description

technical field [0001] The invention relates to the field of molecular spectrum analysis and detection, in particular to a substrate for surface-enhanced Raman scattering and a preparation method thereof. Background technique [0002] When light is irradiated on the material, elastic scattering and inelastic scattering occur. The scattered light of elastic scattering has the same wavelength as the excitation light, and the scattered light of inelastic scattering has components longer and shorter than the wavelength of excitation light, which is called Raman effect, the obtained spectrum is called Raman spectrum. Raman spectroscopy belongs to molecular vibration spectroscopy, which is the fingerprint of material molecules. Raman spectrometers made according to the Raman effect can be used to accurately and qualitatively identify samples. The analysis method of Raman spectroscopy generally does not require pretreatment of samples, and is easy to operate during the analysis pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C18/44
Inventor 范美坤胡建明刘焕明梅军程凡圣张治国
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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