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Surface-enhanced Raman scattering substrate material, preparation method and application thereof

A surface-enhanced Raman and substrate material technology, which is applied in Raman scattering, material excitation analysis, etc. to improve detection capability, improve detection sensitivity, and simplify the preparation process.

Active Publication Date: 2016-01-27
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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  • Surface-enhanced Raman scattering substrate material, preparation method and application thereof
  • Surface-enhanced Raman scattering substrate material, preparation method and application thereof
  • Surface-enhanced Raman scattering substrate material, preparation method and application thereof

Examples

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Embodiment 1

[0025] 1. Preparation of AuAg

[0026] This example is based on the technical solution disclosed in the Chinese invention patent with 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 AuAg film to obtain the single-layer AuAg film substrate. The preparation steps include the preparation of AuAg sol, the formation of monolayer film, transfer and optimization. By regulating the monodispersity of AuAg sol, the volatilization of solvent, the transfer of monolayer film at the design interface, etc., the required AuAg nanoparticle monolayer is obtained. layer 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 AuAg nano-sol. of volatilization. Specifi...

Embodiment 2

[0042] Prepare 5%PDMS-C according to embodiment 1 technical scheme 3 h 7 S-AuAg composite substrate, with single AuAg film, 5%PDMS-AuAg composite substrate, C 3 h 7 S-AuAg 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 four different substrate materials in this example; 3 h 7 SERS signal on S-AuAg composite substrate, b is in C 3 h 7 SERS signal on S-AuAg substrate, c is the SERS signal on 5%PDMS-AuAg substrate, d is the SERS signal on AuAg film; B picture 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 compared with a single AuAg film; only modifying propanethiol can only chemically adsorb tol...

Embodiment 3

[0045] Prepare 5%PDMS-C according to embodiment 1 technical scheme 3 h 7 S-AuAg composite substrate, with single AuAg film, C 3 h 7 S-AuAg composite substrates were 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 992cm -1 Place, p-xylene 1179cm -1 Office, m-xylene 999cm -1 Office, o-xylene 1048cm -1 The vibrational peaks at the position are taken as characteristic peaks. See attached Figure 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-AuAg composite substrate (a), C 3 h 7 SERS spectra on S-AuAg substrate ...

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Abstract

The invention discloses a surface-enhanced Raman scattering substrate material, a preparation method and an application thereof. The substrate material is a three-layer composite structure: the lower layer is an Au (at) Ag nanoparticle monofilm; the middle layer is a propanethiol molecular layer modified on the Au (at) Ag film; and the upper layer is a polydimethylsiloxane film of 200-400 nm thick. According to the three-layer composite structural substrate material, the polydimethylsiloxane film enriches mononuclear aromatics gaseous molecules in flowing gas through physical action, propanethiol adsorbs the molecules onto the surface of the Au (at) Ag film to carry out enhanced detection. Thus, toxic atmospheric pollutants can be effectively enriched, fixed and detected. Especially for detection of methylbenzene, benzene and xylene in a flowing gaseous phase, detection signal intensity is enhanced by more than 50 times. The invention provides a more sensitive new method for detection of relevant pollutants in industrial waste gas and in the atmospheric environment.

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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IPC IPC(8): G01N21/65
Inventor 姚建林夏迪刘国坤田中群
Owner SUZHOU UNIV
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