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Surface-enhanced Raman scattering substrate based on metal nanobowl and its preparation method

A surface-enhanced Raman, metal nanotechnology, applied in Raman scattering, material excitation analysis, instruments, etc., can solve the problems of incapability of large-area preparation, limited wide application, high cost, etc., and achieve high surface-enhanced Raman scattering effect. , good repeatability, low cost effect

Active Publication Date: 2022-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some nanofabrication methods such as nanoimprinting and electron or ion beam lithography have successfully prepared SERS substrates with good properties, especially three-dimensional micro-nanostructures, these methods are expensive, time-consuming and cannot be fabricated in large areas. These shortcomings limit the wide application of these methods
In addition, the enhancement effect of the existing surface-enhanced Raman scattering substrate needs to be further improved

Method used

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  • Surface-enhanced Raman scattering substrate based on metal nanobowl and its preparation method
  • Surface-enhanced Raman scattering substrate based on metal nanobowl and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Based on the preparation method of the surface-enhanced Raman scattering substrate of metal nano bowls, the steps are as follows:

[0026] (1) Preparation of polymer nano bowls;

[0027] Firstly, the mixed film of polystyrene and polymethyl methacrylate with a mass ratio of polystyrene to polymethyl methacrylate of 1:9 was soaked in a mixed solvent for 100 minutes, and the mixed solvent was 2:1:5 by volume. It is composed of methyl ethyl ketone, acetone and water to obtain polymer nanospheres, and then the polymer nanospheres are soaked in cyclohexane for 20 minutes, the polystyrene is removed to obtain polymer nanobowls, and finally they are taken out and dried with compressed gas;

[0028] (2) Taking the polymer nano bowl as the base, and vertically sputtering the metal film on it;

[0029] The process parameters of vertical sputtering are: current 20A, time 4s;

[0030] The metal film is nano silver film.

[0031] The final surface-enhanced Raman scattering substr...

Embodiment 2

[0044] Based on the preparation method of the surface-enhanced Raman scattering substrate of metal nano bowls, the steps are as follows:

[0045] (1) Preparation of polymer nano bowls;

[0046] First, the polystyrene and polymethyl methacrylate mixed film with a mass ratio of polystyrene to polymethyl methacrylate of 9:1 was soaked in a mixed solvent for 5 minutes, and the mixed solvent was 2:1:8 by volume. The polymer nanospheres were prepared by immersing the polymer nanospheres in cyclohexane for 12 minutes, removing the polystyrene to obtain the polymer nanobowls, and finally taking them out and drying them with compressed gas;

[0047] (2) Taking the polymer nano bowl as the base, and vertically sputtering the metal film on it;

[0048] The process parameters of vertical sputtering are: current 15A, time 3s;

[0049] The metal film is a nano-gold film.

[0050] The final surface-enhanced Raman scattering substrates based on metal nanobowls are as follows: figure 1 As ...

Embodiment 3

[0053] Based on the preparation method of the surface-enhanced Raman scattering substrate of metal nano bowls, the steps are as follows:

[0054] (1) Preparation of polymer nano bowls;

[0055] Firstly, the mixed film of polystyrene and polymethyl methacrylate with a mass ratio of polystyrene to polymethyl methacrylate of 1:2 was soaked in a mixed solvent for 50 minutes, and the mixed solvent was 2:1:6 by volume. It is composed of methyl ethyl ketone, acetone and water to obtain polymer nanospheres, and then the polymer nanospheres are soaked in cyclohexane for 18 minutes, the polystyrene is removed to obtain polymer nanobowls, and finally they are taken out and dried with compressed gas;

[0056] (2) Taking the polymer nano bowl as the base, and vertically sputtering the metal film on it;

[0057] The process parameters of vertical sputtering are: current 22A, time 6s;

[0058] The metal film is a nano-gold film.

[0059] The final surface-enhanced Raman scattering substra...

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Abstract

The invention relates to a surface-enhanced Raman scattering substrate based on a metal nanobowl and a preparation method thereof. The surface-enhanced Raman scattering substrate based on a metal nanobowl is composed of a polymer nanobowl and a metal film, and the metal film covers the inside of the polymer nanobowl surface and outer surface; the enhancement factor is 10 based on the metal nanobowl surface-enhanced Raman scattering substrate 7 ~10 9 , the enhancement factor is the ratio of the Raman signal intensity of the dye solution with the same concentration on the enhanced substrate and the non-enhanced substrate. The enhanced substrate is based on the metal nanobowl surface-enhanced Raman scattering substrate. The invention has no metal film; the preparation method is as follows: the polymer nano bowl is used as a substrate, and a metal film is vertically sputtered on the polymer nano bowl to prepare a surface-enhanced Raman scattering substrate based on the metal nano bowl. The preparation method of the invention is simple, and the prepared surface-enhanced Raman scattering substrate based on the metal nano bowl has remarkable enhancement effect.

Description

technical field [0001] The invention relates to the technical field of nano-surface and its preparation, in particular to a metal nano-bowl surface-enhanced Raman scattering substrate and a preparation method thereof. Background technique [0002] Raman enhancement technology is widely used in analytical chemistry, sensing science, molecular bioscience, food science and environmental science, involving important fields such as industry, environment, medical and national defense. Since it was first discovered that electrochemically rough micro-nano-structured Ag electrodes can significantly enhance the spectral line intensity of pyridine molecular Raman spectrum, this phenomenon has aroused extensive interest in the scientific community, and this phenomenon is named surface-enhanced Raman Scattering, or SERS for short. Surface-enhanced Raman scattering is mainly caused by the roughening of the metal surface, which is conducive to the excitation of surface plasmon resonance b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 徐林
Owner DONGHUA UNIV
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