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Surface-enhanced Raman scattering substrate with high activity and uniformity and preparation method thereof

A surface-enhanced Raman, high-activity technology, applied in the fields of functional nanomaterials and analysis and detection, which can solve the problems of poor signal reproducibility, cumbersome preparation process, and small area.

Active Publication Date: 2020-02-04
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and low-cost method for preparing large Surface-enhanced Raman scattering substrates with high activity and high uniformity of area

Method used

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  • Surface-enhanced Raman scattering substrate with high activity and uniformity and preparation method thereof
  • Surface-enhanced Raman scattering substrate with high activity and uniformity and preparation method thereof
  • Surface-enhanced Raman scattering substrate with high activity and uniformity and preparation method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a surface-enhanced Raman scattering substrate with high activity and high uniformity and a preparation method, specifically:

[0027] 1) The concentration is 9×10 -4 The preparation method of the citrate-stabilized monodisperse spherical gold nanoparticle solution of nmol / L refers to Ziegler C, Eychmüller A, J.Phys.Chem.C, 2011, 115(11), 4502-4506, and the average particle diameter is 58nm, Its TEM image and UV-Vis extinction spectrum are as follows figure 1 As shown, it proves that it has a regular spherical shape and a relatively uniform particle size; first, it is centrifuged to completely settle to the bottom of the centrifuge tube; after skimming the supernatant, add 10 μmol / L sodium chloride aqueous solution to obtain a concentration of 9 × 10 -4 The gold nanoparticle solution of nmol / L, and it is placed in the refrigerator of 4 ℃ and is kept for stand-by;

[0028] 2) The size is 15×15mm 2The quartz substrate was placed in chloroform,...

Embodiment 2

[0033] This example provides a surface-enhanced Raman scattering substrate with high activity and high uniformity and its preparation method. The specific steps are basically the same as in Example 1, except that the thickness of the deposited silver is 28nm, that is, the metal nanospheres are obtained. The hybrid structure array with nanopores, the scanning electron microscope image is as follows figure 2 shown. figure 2 g shows that the arrangement of gold nanoparticles is not affected, and the average particle size of the particles has a slight increase; figure 2 h and figure 2 i demonstrate the formation of a gold nanoparticle and silver nanoporous hybrid structure with a distinct annular nanoslit between them.

Embodiment 3

[0035] This example provides a surface-enhanced Raman scattering substrate with high activity and high uniformity and its preparation method. The specific steps are basically the same as in Example 1, except that the thickness of the deposited silver is 40nm, that is, the metal nanospheres are obtained. The hybrid structure array with nanopores, the scanning electron microscope image is as follows figure 2 shown. figure 2 j shows that the arrangement of gold nanoparticles is not affected, and the average particle size of the particles has a slight increase; figure 2 k and figure 2 l shows that some gold nanoparticles are fused with the nanopores, and the ring-shaped nanoslit between the two also disappears.

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Abstract

The invention provides a SERS (surface enhanced Raman scattering) substrate with high activity and high uniformity and a preparation method of the SERS substrate and belongs to the technical fields of functional nanomaterials and analysis and detection. Under the action of electrostatic adsorption, spherical metal nanoparticle arrays with uniform size are assembled on the substrate uniformly. On the basis, a metal layer is redeposited, hybridization structures of metal nanospheres and nanopores are obtained, and annular nano gaps formed between the metal nanospheres and the nanopores are taken as hot spots of SERS; width of the annular gaps can be controllably adjusted according to the thickness of deposited metal, so that the Raman enhancement effect of the substrate is optimized; outstanding uniformity of the SERS substrate can be realized by eliminating negative effects of the abnormal hot spots on SERS signals.

Description

technical field [0001] The invention belongs to the technical field of functional nanomaterials and analysis and detection, and in particular relates to a surface-enhanced Raman scattering substrate with high activity and high uniformity and a preparation method thereof. Background technique [0002] The generation of Raman spectroscopy comes from the inelastic scattering of incident electromagnetic waves by molecular vibrations, which can provide very important fingerprint information for molecular structure analysis. However, the light scattering intensity of traditional Raman spectroscopy is low, resulting in weak spectral signals, which prevents it from being applied on a large scale in actual production and life. A technique called surface-enhanced Raman spectroscopy (SERS) has received much attention and has been largely developed over the past half century. Generally speaking, the substrate used in SERS is a nano- or micro-scale structure of noble metals such as gold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张俊虎叶顺盛王宏禹常玲霞杨柏
Owner JILIN UNIV
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