Water-soluble graphene-noble-metal nano-composite and preparation method and application thereof

A nano-composite, graphite nano-sheet technology, applied in metal/alloy conductors, carbon-silicon compound conductors, cable/conductor manufacturing, etc., can solve the problems of harsh operating conditions, poor dispersion, hindering application, etc., and achieve simple operation. , Non-polluting reaction conditions requirements, the effect of improving the load rate

Inactive Publication Date: 2012-04-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor dispersion of graphene-based metal nanocomposites prepared by prior art methods in solvents, and the reagents used when reducing and modifying graphene often have high toxicity, and the operating conditions are harsh and difficult to control, thus hindering its further application

Method used

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  • Water-soluble graphene-noble-metal nano-composite and preparation method and application thereof
  • Water-soluble graphene-noble-metal nano-composite and preparation method and application thereof
  • Water-soluble graphene-noble-metal nano-composite and preparation method and application thereof

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Embodiment 1

[0049] The water-soluble graphene-platinum nanocomposite of the present invention comprises a graphene sheet layer, and nano-platinum particles are covalently bonded to the graphene sheet layer through L-cysteine; meanwhile, the graphene sheet layer is also directly loaded with Platinum nanoparticles. Wherein, the diameter of the nano-platinum particles is 5 nm to 20 nm. This water-soluble graphene-platinum nanocomposite is prepared through the following steps:

[0050] 1. Material preparation: Prepare graphite oxide nanosheets and L-cysteine ​​hydrochloride, and prepare 0.1 M chloroplatinic acid solution;

[0051] 2. Combined with L-cysteine: ultrasonically disperse 40 mg of graphite oxide nanosheets in 40 mL of ultrapure water to obtain the following figure 1 (a) The graphene oxide shown in (a); add 350 mg of L-cysteine ​​hydrochloride and mix well, adjust the pH of the solution to 12, slowly add 320 mg of sodium borohydride particles, and stir the reaction at room tempera...

Embodiment 2

[0056] The water-soluble graphene-platinum nanocomposite of the present invention comprises a graphene sheet layer, and nano-platinum particles are covalently bonded to the graphene sheet layer through L-cysteine; meanwhile, the graphene sheet layer is also directly loaded with Platinum nanoparticles. Wherein, the diameter of the nano-platinum particles is 5 nm to 20 nm. This water-soluble graphene-platinum nanocomposite is prepared through the following steps:

[0057] 1. Material preparation: Prepare graphite oxide nanosheets and L-cysteine ​​hydrochloride, and prepare 0.1 M chloroplatinic acid solution;

[0058] 2. Combining with L-cysteine: ultrasonically disperse 20 mg of graphite oxide nanosheets in 20 mL of ultrapure water to obtain graphene oxide, add 160 mg of L-cysteine ​​hydrochloride and mix well; adjust The pH value of the solution was 11, 60 mL of ethylene glycol was added, and the reaction was stirred for 3 h in an oil bath at 100 °C at a stirring rate of 100 ...

Embodiment 3

[0061] The water-soluble graphene-nano-gold composite of the present invention comprises graphene sheets, and the graphene sheets are covalently bound with nano-gold particles through L-cysteine; meanwhile, the graphene sheets are also directly loaded with gold nanoparticles. Wherein, the diameter of the gold nanoparticles is 5 nm to 20 nm. This water-soluble graphene-nano gold composite is prepared through the following steps:

[0062] 1. Material preparation: prepare graphite oxide nanosheets and L-cysteine ​​hydrochloride, and prepare 0.1 M chloroauric acid solution;

[0063] 2. Combining with L-cysteine: ultrasonically disperse 30 mg of graphite oxide nanosheets in 30 mL of ultrapure water to obtain graphene oxide, add 250 mg of L-cysteine ​​hydrochloride and mix well to adjust the solution The pH value of the solution was 13, slowly added 200 mg of sodium borohydride particles, stirred and reacted for 24 h in the dark at room temperature, and the stirring rate was 100 r...

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Abstract

The invention discloses a water-soluble graphene-noble-metal nano-composite and a preparation method and application thereof. The nano-composite comprises a graphene lamina and noble metal nano-particles covalently bonded on the graphene lamina through L-gystein. The preparation method for the water-soluble graphene-noble-metal nano-composite comprises the following steps of: ultrasonically dispersing a graphite oxide nano-sheet in ultra-pure water; adding L-gystein hydrochloride and a reductive agent to perform a reduction reaction; adding a noble metal ion solution; and adding the reductive agent to perform the reduction reaction again to obtain the nano-composite. The nano-composite can be used as a conductive material. The nano-composite has the characteristics of high load rate, good water solubility and biocompatibility, simple operation and environmental protection.

Description

technical field [0001] The invention relates to the field of conductive composite materials, in particular to a water-soluble graphene-noble metal nanocomposite and its preparation method and application. Background technique [0002] Graphene is a carbonaceous material with a two-dimensional honeycomb lattice structure formed by a single layer of carbon atoms tightly packed. It is also the thinnest single-atom-thick material in the world. Because graphene has a unique nanostructure and exhibits super strong mechanical properties and excellent electrical properties, it has shown extremely high application value in many fields such as microelectronics, biomedicine, information transmission and nanocomposites. However, in the dispersion process of graphene, due to the single complete six-membered ring structure, there is a strong intermolecular force between the graphene sheets, which are easy to stack together, and the graphene surface is stable and inert, so it is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02H01B1/04H01B13/00G01N27/30
Inventor 曾光明李贞汤琳伍梦诗刘灿章毅庞娅刘媛媛雷晓霞
Owner HUNAN UNIV
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