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A kind of method for preparing nano-silver-graphene composite film

A graphene composite, composite film technology, applied in solid-state chemical plating, metal material coating process, coating and other directions, can solve problems such as high cost, restricted application scope, inability to prepare large size, etc., and achieve excellent Raman enhancement. effect of effect

Active Publication Date: 2015-12-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The detection of toxic molecules in biological materials and liquids is very important to human health and the environment. However, in most cases, ordinary Raman spectroscopy is insensitive to extremely low concentrations of harmful molecules in liquids and cannot be effectively detected. come out; and Raman enhanced technology can effectively solve this problem, because Raman enhanced technology can have a huge vibration signal, which can increase its intensity by more than 10 orders of magnitude; we all know that nano silver has excellent Raman enhanced effect, And it is widely used on Raman enhanced probes. There are many processes for preparing nano-silver Raman enhanced materials, such as: electron beam etching, nanosphere etching, vacuum evaporation, etc.; however, these processes are costly and cannot be prepared in large sizes. , a flexible Raman-reinforced material, which seriously restricts its application range; in order to solve this problem, finding a suitable carrier and obtaining a nano-silver-carrier composite material may be a good way out

Method used

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  • A kind of method for preparing nano-silver-graphene composite film
  • A kind of method for preparing nano-silver-graphene composite film
  • A kind of method for preparing nano-silver-graphene composite film

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Experimental program
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Effect test

Embodiment 1

[0024] First prepare graphene oxide into a suspended aqueous solution with a concentration of 1mg / mL and ultrasonically disperse until uniformly dispersed, then mix 10mL silver nitrate aqueous solution with a concentration of 0.029mmol / mL and 50mL graphene oxide aqueous solution, and obtain silver ion-graphite oxide after ultrasonic dispersion for 2 hours ene colloidal solution; take 10mL silver ion-graphene oxide colloidal solution, adopt vacuum filtration process to obtain silver ion-graphene oxide composite film, place the film in a drying oven at 30°C for 1 hour, remove the filter membrane, and compound the obtained The film is placed in a tube furnace at 300°C and heat-treated for 2 hours in a hydrogen / argon (volume ratio 1:2) mixed gas to obtain a nano-silver-graphene composite film.

[0025] figure 1 For the SEM photo of the composite film, from figure 1 It can be seen in the figure that many nano-silver particles have been distributed on the graphene film, but the num...

Embodiment 2

[0027] First prepare graphene oxide into a suspended aqueous solution with a concentration of 1mg / mL and ultrasonically disperse until uniformly dispersed, then mix 10mL silver nitrate aqueous solution with a concentration of 0.029mmol / mL and 50mL graphene oxide aqueous solution, and obtain silver ion-graphite oxide after ultrasonic dispersion for 2 hours ene colloidal solution, take 10mL silver ion-graphene oxide colloidal solution, adopt vacuum filtration process to obtain silver ion-graphene oxide composite film, place the film in a drying oven at 30°C for 1 hour and then remove the filter membrane; The film is placed in a tube furnace at 400°C and heat-treated in a hydrogen / argon (volume ratio 1:2) mixed gas for 2 hours to obtain a nano-silver-graphene composite film.

[0028] figure 2 For the SEM photo of the composite film, from figure 2 It can be seen that as the temperature rises to 400°C, the top of the graphene film has been completely covered by silver nanopartic...

Embodiment 3

[0030] First prepare graphene oxide into a suspended aqueous solution with a concentration of 1mg / mL and ultrasonically disperse until uniformly dispersed, then mix 10mL silver nitrate aqueous solution with a concentration of 0.029mmol / mL and 50mL graphene oxide aqueous solution, and obtain silver ion-graphite oxide after ultrasonic dispersion for 2 hours ene colloid solution, take 10mL silver ion-graphene oxide colloid solution, adopt vacuum filtration process to obtain silver ion-graphene oxide composite film, place the film in a drying oven at 30°C for 1 hour, remove the filter membrane, and compound the obtained film The film is placed in a tube furnace at 600°C and heat-treated in a hydrogen / argon (volume ratio 1:2) mixed gas for 2 hours to obtain a nano-silver-graphene composite film.

[0031] image 3 For the SEM photo of the composite film, from image 3 It can be seen that as the temperature rises to 600 °C, the morphology of the obtained composite film changes great...

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Abstract

The invention belongs to the technical field of inorganic functional materials, and specifically refers to a method for preparing a large-sized, flexible, unsupported nano-silver-graphene composite film with Raman enhancement effect; utilizing the strong adsorption function and thin plate function of graphene oxide, through Silver ion-graphene oxide colloidal solution is obtained by self-assembly and adsorption of silver ions, silver ion-graphene oxide film is obtained through vacuum filtration process, and the obtained film is subjected to high-temperature heat treatment and reduction process to finally obtain nano-silver-graphene composite film. It has excellent Raman enhancement effect.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and specifically refers to a method for preparing a large-sized, flexible, unsupported nano-silver-graphene composite film with Raman enhancement effect; utilizing the strong adsorption function and thin plate function of graphene oxide, through Silver ion-graphene oxide colloidal solution is obtained by self-assembly and adsorption of silver ions, silver ion-graphene oxide film is obtained through vacuum filtration process, and the obtained film is subjected to high-temperature heat treatment and reduction process to finally obtain nano-silver-graphene composite film. It has excellent Raman enhancement effect. Background technique [0002] The detection of toxic molecules in biological materials and liquids is very important to human health and the environment. However, in most cases, ordinary Raman spectroscopy is not sensitive to extremely low concentrations of harmful m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08C23C20/04
Inventor 周亚洲杨娟程晓农钟涛卢玉新陈翠玉
Owner JIANGSU UNIV
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