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Preparation method and application of graphene-polypyrrole-gold nanoparticle composite material

A technology of gold nanoparticles and composite materials, which is applied in the field of preparation of graphene-polypyrrole-gold nanoparticle composite materials, can solve the problems of low chemical activity and easy agglomeration of the surface of gold nanoparticles, and achieve simple and good process. Effects of biocompatibility and good conductivity

Active Publication Date: 2018-11-06
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

It overcomes the problem that the chemical activity of graphene is not high, and the surface of gold nanoparticles is easy to agglomerate

Method used

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  • Preparation method and application of graphene-polypyrrole-gold nanoparticle composite material
  • Preparation method and application of graphene-polypyrrole-gold nanoparticle composite material

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Embodiment

[0026] A kind of preparation method of graphene-polypyrrole-gold nanoparticle composite material:

[0027] Step 1) Solution configuration, add 0.1 g and 1 g pyrrole solution to 100 mL aqueous solution, then add 1 g graphene to the solution, ultrasonically disperse for 1 h, denoted as solution M, add 2 g ammonium persulfate Dissolved in 10 mL of aqueous solution, recorded as solution N;

[0028] Step 2) Mixing reaction of the solution to prepare the polypyrrole-graphene rice composite material, slowly add the solution N described in step 1 to the solution M, and stir it with a magnetic stirrer, after the addition is completed, let the solution Reacted for 2 hours, then filtered, washed, and dried to obtain the polypyrrole-graphene rice composite material;

[0029] Step 3) Preparation of gold nanoparticle solution, add 0.1 g chloroauric acid into 100 mL water, stir, then add 0.5 g trisodium citrate, then add 0.1 g NaBH 4 Reduction to obtain the required gold nanoparticle solut...

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Abstract

The invention discloses a graphene-polypyrrole-gold nanoparticle composite material which is characterized in that a method combining in-situ chemical polymerization with electrostatic adsorption is adopted to load gold nanoparticles onto a graphene-polypyrrole composite material. The preparation method comprises the following steps: 1) configuration of a solution; 2) preparation of a polypyrrole-graphene nano-composite material by a mixed reaction of the solution; 3) preparation of a gold nanoparticle solution; 4) adsorption of the gold nanoparticles. The invention further discloses the application of the graphene-polypyrrole-gold nanoparticle composite material, and the composite material is applied to the modification of electrodes of an impedance type escherichia coli biosensor, wherea linear range of detection of the escherichia coli is 1*102-1*107 CFU / mL, and the minimum detection limit is 100 CFU / mL. The impedance type escherichia coli biosensor prepared by the invention has the advantages of simple operation, low cost, convenient use, high selectivity and the like, and thus has great potential application values in the fields of food safety, clinical analysis and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of graphene-based nanocomposite materials, in particular to a preparation method and application of graphene-polypyrrole-gold nanoparticle composite materials. Background technique [0002] Escherichia coli O157:H7 (Escherichia coli O157:H7) is an enterohemorrhagic Escherichia coli that is one of the causes of food poisoning. Infected people usually develop bloody diarrhea, especially in young children and the elderly, sometimes leading to kidney failure. Transmission is via the fecal-oral route, with many cases associated with eating undercooked or contaminated beef and pork, swimming, drinking contaminated water, and eating contaminated vegetables. Therefore, the rapid and accurate identification of foodborne E. coli O157:H7 is of great significance for preventing the spread of diseases. [0003] Existing traditional detection methods, such as PCR and ELISA, etc., although they can be dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327G01N27/30
CPCG01N27/30G01N27/3278
Inventor 邹勇进梁靖向翠丽褚海亮邱树君孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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