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Preparation method for surface-enhanced Raman spectrum compound substrate

A surface-enhanced Raman and composite substrate technology, which is applied in the field of nanomaterials and instrument analysis, can solve the problems of reducing SERS activity, chemical stability, and chemical stability in biological applications, and achieves simple and easy-to-operate composite methods and good chemical stability , The effect of low equipment requirements

Inactive Publication Date: 2014-01-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using Ag as a substrate is also accompanied by serious drawbacks, such as: chemical stability and biological application
Ag is easily oxidized or sulfurized in air or water, which will reduce its SERS activity and chemical stability

Method used

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  • Preparation method for surface-enhanced Raman spectrum compound substrate
  • Preparation method for surface-enhanced Raman spectrum compound substrate
  • Preparation method for surface-enhanced Raman spectrum compound substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Analyze the sample prepared in this embodiment, figure 1 It is the SEM picture of the Ag nano-array SERS substrate prepared in this example after being exposed to the air for 30 days, in which the Ag particles become rough and uneven. image 3 Middle line 1 is the XPS line of the Ag nanoarray SERS substrate prepared in Example 1 after being exposed to air for 30 days, in which there is an obvious AgS signal, indicating that the Ag nanoparticles are vulcanized. Figure four Middle spectral line 1, Raman spectrum picture, shows that the SERS capability of the Ag nanoarray is very weak after denaturation.

[0029] Example 2

Embodiment 2

[0031] Analyze the sample prepared in this embodiment, figure 2 It is the SEM picture of the composite SERS substrate prepared in this example after being exposed to the air for 30 days, in which there is no obvious shape change of the Ag particles. image 3 Middle line 2 is the XPS pattern of the composite SERS substrate prepared in Example 2 after being exposed to air for 30 days, in which there is no obvious AgS signal, indicating that the chemical properties of Ag in the composite SERS substrate are stable. Figure four Middle spectral line 2, Raman spectrum picture, shows that the composite SERS substrate has stronger and more stable Raman enhancement ability.

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Abstract

The invention discloses a preparation method for a surface-enhanced Raman spectrum compound substrate with stable chemical property. The preparation method comprises the following steps: transferring single-layer graphene which grows on a copper foil through the CVD (chemical vapor deposition) technology to a silver nano array prepared through a polystyrene microsphere template method, keeping warm at 50 DEG C for 30 min, and firmly binding the single-layer graphene and the noble metal nano array to form the surface-enhanced Raman spectrum compound substrate. The surface-enhanced Raman spectrum compound substrate prepared through the method has the advantages that the method is simple, the material is cheap, the substrate is large in area and ordered, the chemical property is stable, and the effects of sulfuration resistance and oxidation resistance are realized.

Description

[0001] technical field [0002] The invention belongs to the field of nanometer material and instrument analysis, and relates to a method for preparing a surface-enhanced Raman spectrum composite substrate. Background technique [0003] With the discovery and research progress of the surface-enhanced Raman scattering (SERS) effect, SERS has become an important method for trace detection. This technology is widely used in the study of corrosion, catalytic intermediate products, metals and thermal decomposition processes, drugs The identification of pesticides, the detection of pesticide residues on the surface of vegetables and fruits, the analysis of trace components in ink blots, and even single-molecule detection. In the SERS effect, the active substrate plays a key role in the enhancement effect. Studies have found that only a few metals such as gold and silver after surface roughening have high SERS activity, and the roughness of the active substrate plays a crucial rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 肖湘衡戴志高梅菲郑俊丰李文庆任峰蒋昌忠
Owner WUHAN UNIV
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