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A surface-enhanced Raman spectroscopy base material, preparation method and application

A surface-enhanced Raman and base material technology, applied in Raman scattering, material excitation analysis, etc., to improve the detection capability, simplify the preparation process, and reduce the detection cost.

Active Publication Date: 2018-07-31
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the thickness of the PDMS film is on the micron scale, a large number of enriched molecules in the PDMS layer do not reach the "hot spot" on the surface of the Au monolayer film, so the SERS signal intensity comes from only a small number of molecules that reach the "hot spot" area

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  • A surface-enhanced Raman spectroscopy base material, preparation method and application
  • A surface-enhanced Raman spectroscopy base material, preparation method and application
  • A surface-enhanced Raman spectroscopy base material, preparation method and application

Examples

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Embodiment 1

[0025] 1. Preparation of Au@Ag

[0026] This example is based on the technical solution disclosed in the Chinese invention patent with the publication number CN103590037A, and the preparation method and device of the Au nanoparticle monolayer film provided by it are applied to the preparation of the Au@Ag film to obtain the monolayer Au@Ag film. Ag film substrate. The preparation steps include the preparation of Au@Ag sol, the formation of monolayer film, transfer and optimization. By regulating the monodispersity of Au@Ag sol, the volatilization of solvent, and the transfer of monolayer film at the designed interface, the required Au@Ag nanoparticle monolayer film. In the solvent volatilization step, a special chimney device is used, including two parts connected up and down. The lower part is a cylindrical container cavity, and the upper part is a wheel-shaped exhaust pipe with air holes on the top, which can effectively control Au@Ag. Volatilization of nano-sols. Specifi...

Embodiment 1

[0042] Prepare 5% PDMS-C according to the technical scheme of Example 1 3 h 7 S-Au@Ag composite substrate, with single Au@Ag film, 5%PDMS-Au@Ag composite substrate, C 3 h 7 S-Au@Ag composite substrates were compared for SERS detection of toluene gas molecules in flow systems.

[0043] See attached Figure 5 , which is the SERS spectrum of toluene gas molecules adsorbed on the above-mentioned 4 different substrate materials in the present embodiment; among the A figure, a is the toluene gas molecules in 5% PDMS-C 3 h 7 SERS signal on S-Au@Ag composite substrate, b is in C 3 h 7 SERS signal on S-Au@Ag substrate, c is the SERS signal on 5% PDMS-Au@Ag substrate, d is the SERS signal on Au@Ag film; B is toluene 1003cm -1 Comparison of signal intensities of characteristic peaks on the above four substrates. Depend on Figure 5 It can be seen that only spin-coating PDMS can only physically enrich the toluene gas molecules, which can increase the signal by about 6 times compa...

Embodiment 1

[0045] Prepare 5% PDMS-C according to the technical scheme of Example 1 3 h 7 S-Au@Ag composite substrate, with a single Au@Ag film, C 3 h 7 The S-Au@Ag composite substrate was used for SERS detection of benzene, p-xylene, m-xylene, and o-xylene gas molecules in the flow system. Benzene, p-xylene, m-xylene, and o-xylene gas molecules are widely considered to be highly volatile, highly toxic, carcinogenic, and have major hidden dangers to human safety, so they are highly sensitive to them in the flowing gas , Rapid detection is crucial. This embodiment selects benzene 992 cm -1 place, p-xylene 1179 cm -1 Office, m-xylene 999cm -1 place, o-xylene 1048 cm -1 The vibrational peaks at the position are taken as characteristic peaks. See attached Image 6 , it is the 4 kinds of gas molecules (benzene, p-xylene, m-xylene, ortho-xylene) adsorbed on the above-mentioned 3 different substrate materials (PDMS-C 3 h 7 S-Au@Ag composite substrate (a), C 3 h 7 SERS spectra on...

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Abstract

The invention discloses a surface-enhanced Raman spectrum base material, a preparation method and an application. The base material is a three-layer composite structure, the lower layer is a single-layer film of Au@Ag nanoparticles, the middle layer is a molecular layer of propanethiol modified on the Au@Ag film, and the upper layer is a polydimethylsiloxane film with a thickness of 200-400nm. In the three-layer composite structure substrate material provided by the invention, the polydimethylsiloxane film enriches the gaseous molecules of single-ring aromatic hydrocarbons in the flowing gas through physical action, and propanethiol adsorbs the molecules to the surface of the Au@Ag film for enhancement. Therefore, it can effectively enrich, fix, and detect toxic air pollutants, especially for toluene, benzene, and xylene in the mobile gas phase, and its detection signal intensity is increased by more than 50 times. The detection of related pollutants provides a more sensitive new method.

Description

technical field [0001] The invention relates to a surface-enhanced Raman spectrum base material, in particular to a surface-enhanced Raman sensing base material for identifying the gaseous state of single-ring aromatic hydrocarbons, a preparation method and an application thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) technology is a kind of fingerprint identification spectroscopy technology, which provides the material structure information of the analyte by giving the vibration spectrum of the analyte. Due to its ability to identify molecules at the single-molecule level, SERS has attracted much attention in the fields of chemical sensing and environmental monitoring, and has shown broad application prospects in the detection of trace molecules in liquid, atmospheric and biological tissue environments. The appearance of the portable Raman instrument makes the on-site, real-time and rapid detection of the detected substance possible. In g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 姚建林夏迪刘国坤田中群
Owner SUZHOU UNIV
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