Method for preparing high-stability surface enhanced Raman scattering substrate

A technology of surface Raman and high stability, applied in Raman scattering, material excitation analysis, etc., can solve the problems of surface Raman enhanced performance reduction, stability inspection of composite thin films, complex preparation process, etc., to achieve stability and Raman Improvement of Mann enhancement performance, excellent SERS performance, and simple preparation process

Inactive Publication Date: 2015-04-29
JIANGSU UNIV
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Problems solved by technology

CN103334096 A discloses a kind of method of nanometer silver-graphene composite film, it first obtains silver ion-graphene oxide composite film with vacuum suction method, then heat treatment reduction under hydrogen and argon mixed gas at high temperature obtains nanometer silver- Graphene composite film, which has excellent surface-enhanced Raman properties, the above preparation process is relatively complicated and costly, and the stability of the prepared composite film was not investigated. Zhou et al. proved that with time Extended, the surface Raman enhanced performance of the prepared nano-silver-graphene composite film is reduced, because part of the nano-silver is exposed to oxidation in the air; in order to solve this problem, the present invention intends to A layer of graphene is pulled on the outer surface of the silver-graphene composite film as a protective layer to slow down the oxidation process of nano-silver in the composite film, and a surface Raman scattering enhanced substrate with high stability is obtained

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  • Method for preparing high-stability surface enhanced Raman scattering substrate
  • Method for preparing high-stability surface enhanced Raman scattering substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 mainly investigates the effect of loading GO and GOT protective layers on the outer surface of the composite film on the surface morphology and structure of the film.

[0029] Take three Ag NPs / GOT (Ag) composite films prepared above, and two of them were respectively immersed in the same concentration of GO suspension. -1 The substrate was taken out at a pulling speed of 100°C, blown dry with nitrogen, and the obtained composite film was labeled as Ag NPs / GOT (GO).

[0030] One of them was reduced by heat treatment at 600°C for 2 h, and the obtained composite film was marked as Ag NPs / GOT (GOT), that is, three composite films were obtained: Ag NPs / GOT (Ag), Ag NPs / GOT (GO), Ag NPs / GOT (GOT ).

[0031] figure 1 (a-c) are the SEM images of the three composite films, respectively.

[0032] From figure 1 In (a), it can be seen from the scanning picture of the Ag NPs / GOT (Ag) composite film that the nano-silver was successfully loaded on the graphene sheet b...

Embodiment 2

[0036] Example 2 mainly investigates the effect of loading GO and GOT protective layers on the outer surface of the composite film on the SERS detection ability of the film.

[0037] Get three kinds of composite membranes among the embodiment 1 to adsorb low concentration (less than 10 -5 mol L -1 ) Rhodamine 6G (R6G) molecules were detected by Raman, and the detection results were as follows figure 2 shown.

[0038] From figure 2 In (a), it can be seen that all three films have obvious SERS effect on R6G; careful comparison shows that compared with Ag NPs / GOT (Ag) composite film, the SERS effect of Ag NPs / GOT (GOT) composite film is Enhanced, while the SERS effect of the Ag NPs / GOT (GO) composite film is weakened. At the same time, after we placed the Ag NPs / GOT (GOT) composite film for six months, it also adsorbed low concentrations (less than 10 -5 mol L -1 ) Raman detection results after rhodamine 6G (R6G) molecules are as follows figure 2 As shown in (b), it can ...

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Abstract

The invention belongs to the technical field of inorganic functional materials, and particularly relates to a method for preparing a high-stability surface enhanced Raman scattering substrate. Silver nitrate is adopted as a precursor, PDDA is adopted as a modification reagent, sodium borohydride is adopted as a reducing agent, and nano-silver sol is prepared by reaction; GO is adopted as a template, and the high-stability surface enhanced Raman scattering substrate is obtained by utilizing a strong adsorption function and a template function of the GO, adopting a Czochralski method and adsorbing silver nano particles in an electrostatic self-assembly mode.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and particularly refers to a method for preparing a highly stable surface Raman scattering enhanced substrate. Silver nitrate is used as a precursor, PDDA is used as a modification reagent, and sodium borohydride is used as a reducing agent to prepare nano-silver by reaction. The sol uses GO as a template, utilizes the strong adsorption function and template function of graphene oxide, adopts the pulling method, and absorbs silver nanoparticles through electrostatic self-assembly to obtain a highly stable surface Raman scattering enhanced substrate. Background technique [0002] Surface-enhanced Raman scattering (SERS) detection technology is an important research tool in many fields, such as food safety, forensic identification, security detection and internal medicine; in recent years, due to the excellent properties of graphene (GE) Chemical stability and biocompatibilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 马双彪杨娟蔡世龙赵南傅小齐程晓农
Owner JIANGSU UNIV
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