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Method for preparing nano-silver-graphene composite film

A graphene composite and nano-silver technology, applied in solid-state chemical plating, metal material coating process, coating, etc., can solve the problems of high cost, inability to prepare large sizes, and restrict application range, etc., to achieve excellent Raman enhancement effect of effect

Active Publication Date: 2013-10-02
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing nano-silver-graphene composite film
  • Method for preparing nano-silver-graphene composite film
  • Method for preparing nano-silver-graphene composite film

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Embodiment 1

[0024] Firstly, the graphene oxide was prepared into a suspended aqueous solution with a concentration of 1 mg / mL and ultrasonically dispersed until it was uniformly dispersed, then 10 mL of silver nitrate aqueous solution with a concentration of 0.029 mmol / mL was mixed with 50 mL of graphene oxide aqueous solution, and the silver nitrate solution was obtained after ultrasonic dispersion for 2 h. Ion-graphene oxide colloidal solution; take 10 mL silver ion-graphene oxide colloidal solution, use vacuum filtration process to obtain silver ion-graphene oxide composite film, put the film in a drying oven at 30°C for 1 h, and then remove it Filter the membrane, and place the obtained composite film in a tube furnace at 300 °C for 2 h 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 distribut...

Embodiment 2

[0027] Firstly, the graphene oxide was prepared into a suspended aqueous solution with a concentration of 1 mg / mL and ultrasonically dispersed until it was uniformly dispersed, then 10 mL of silver nitrate aqueous solution with a concentration of 0.029 mmol / mL was mixed with 50 mL of graphene oxide aqueous solution, and the silver nitrate solution was obtained after ultrasonic dispersion for 2 h. Ion-graphene oxide colloidal solution, take 10 mL silver ion-graphene oxide colloidal solution, use vacuum filtration process to obtain silver ion-graphene oxide composite film, put the film in a drying oven at 30 ° C for 1 h and remove Filtration membrane; the obtained composite film was placed in a tube furnace at 400 °C and heat-treated in a hydrogen / argon (volume ratio 1:2) mixed gas for 2 h 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 t...

Embodiment 3

[0030] Firstly, the graphene oxide was prepared into a suspended aqueous solution with a concentration of 1 mg / mL and ultrasonically dispersed until it was uniformly dispersed, then 10 mL of silver nitrate aqueous solution with a concentration of 0.029 mmol / mL was mixed with 50 mL of graphene oxide aqueous solution, and the silver nitrate solution was obtained after ultrasonic dispersion for 2 h. Ion-graphene oxide colloidal solution, take 10 mL silver ion-graphene oxide colloidal solution, use vacuum filtration process to obtain silver ion-graphene oxide composite film, put the film in a drying oven at 30 ° C for 1 h and remove The membrane was filtered, and the obtained composite film was placed in a tube furnace at 600 °C for 2 h in a hydrogen / argon (volume ratio 1:2) mixed gas 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 th...

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Abstract

The invention belongs to the technical field of inorganic functional materials, in particular to a method for preparing a large-size, flexible and unsupported nano-silver-graphene composite film having the Raman enhancement effect, which comprises the following steps of: obtaining silver ion-graphene oxide colloid solution by adsorbing silver ions through self-assembly by utilizing strong adsorption function of graphene oxide and the functions of a thin plate, obtaining a silver ion-graphene oxide film through a vacuum suction filtration process, processing the obtained film through a high-temperature heat treatment reduction process, and finally, obtaining the nano-silver-graphene composite film. The nano-silver-graphene composite film prepared by the invention 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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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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