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Preparation method of a nano-heterojunction surface-enhanced Raman active substrate

A surface-enhanced Raman, active substrate technology, applied in Raman scattering, material excitation analysis, instruments, etc., can solve Raman spectrum interference, cannot surface-enhanced Raman active material nano-silver particles increase the specific surface area, enhance Raman The problem of low effect, etc., can improve the electric field enhancement effect, the surface morphology of the film is uniform, and the composition of the substrate can be controlled.

Active Publication Date: 2020-05-12
WUYI UNIV
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Problems solved by technology

The graphene used in this method is a flake material, which cannot increase the specific surface area of ​​the surface-enhanced Raman active material nano-silver particles, and its overall surface-enhanced Raman effect is not high; in addition, the preparation process of the composite material used Organic substances will interfere with high-precision testing Raman spectroscopy

Method used

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Embodiment Construction

[0023] The present invention will be further described below.

[0024] The preparation method of the nano-heterojunction surface-enhanced Raman active substrate of the present invention comprises the following steps:

[0025] A. Pretreatment of the substrate;

[0026] The material of the substrate can be glass flake, quartz glass flake or silicon flake, preferably glass flake; the substrate is washed, dried and treated with plasma for use.

[0027] B. Coating on the substrate: Spin-coat nano-titanium dioxide aqueous dispersion on the substrate. The particle size of nano-titanium dioxide is 20-50nm. After one layer is coated, it is treated with air plasma once; repeat the coating step several times to form a uniform texture and an appropriate thickness. Nano titanium dioxide film;

[0028] Among them, the concentration of nano-titanium dioxide aqueous dispersion is preferably 10-200g / L, and the number of repeated coatings is 3-5 times; when the concentration is low, the numbe...

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Abstract

The invention discloses a preparation method of a nano heterojunction surface enhancement Raman active substrate. The method includes the steps of: plating a substrate with a nano TiO2 film by means of large specific surface area and good adsorption performances of the nano TiO2 film; performing air plasma treatment to remove an organic dispersant from the surface and uniformly adsorbing nano silver onto the surface of the film; and performing hydrogen plasma treatment to enable the nano TiO2 and the nano silver on the surface to from the nano heterojunctions, thereby improving the activity and stability of the substrate with increase of the specific surface area of the active substance, nano silver particles. The surface enhancement Raman active substrate satisfies high-precision test demand, and can be widely applied in the fields of biology, cultural relics, chemical engineering, foods, etc.

Description

technical field [0001] The invention relates to a preparation method of a surface-enhanced Raman active substrate, in particular to a preparation method of a nano-heterojunction surface-enhanced Raman active substrate. Background technique [0002] Raman spectroscopy, like infrared spectroscopy, belongs to molecular vibration spectroscopy, which can reflect the characteristic structure of molecules. But the Raman scattering effect is a very weak process, only about 10^-10 of the incident light intensity, so the Raman signal is very weak. The emergence of the surface-enhanced Raman effect overcomes the shortcomings of low sensitivity of conventional Raman spectroscopy, and can obtain structural information that is not easily obtained by conventional Raman spectroscopy. It is widely used in surface research, surface state research on adsorption interfaces, and interface orientation of biological molecules And configuration, conformational research, structural analysis, etc., ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 范海陆赵燕何鑫
Owner WUYI UNIV
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