Method for preparing gold nano particle and graphene composite material through fast reduction

A technology of gold nanoparticles and composite materials, applied in the field of preparation of reduced graphene oxide sheets, gold nanoparticles and composite materials of the two, can solve the problems of poor stability, easy agglomeration, and excessive surface energy of nanoparticles, and achieves The effect of strong repeatability, uniform distribution and simple process

Active Publication Date: 2014-12-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, due to the large surface energy of nanoparticles, there are problems such as poor stability and easy agglomeration. Therefore, finding a suitable substrate and preparing metal nanoparticle composite materials has become an effective way to exert the effect of gold nanoparticles.

Method used

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  • Method for preparing gold nano particle and graphene composite material through fast reduction
  • Method for preparing gold nano particle and graphene composite material through fast reduction
  • Method for preparing gold nano particle and graphene composite material through fast reduction

Examples

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preparation example Construction

[0031] Preparation of graphene oxide: using the improved Hummers method to prepare graphite oxide to obtain graphite oxide gel;

[0032] Described utilizing improved Hummers method to prepare graphite oxide specific steps are:

[0033] A. Low temperature reaction stage:

[0034] A1. Under the condition of an ice-water bath, take 20-23ml of concentrated sulfuric acid with a mass fraction of 98% in a three-necked flask, stir for 5-10mins, then add graphite powder that is 4.35-4.55% by weight with the concentrated sulfuric acid solution, Particle size ≤ 30um, stirring for 15-30mins to obtain a mixed solution of concentrated sulfuric acid and graphite powder,

[0035] A2. Take by weighing the sodium nitrate that is 2.50-3.60% by weight of the above-mentioned concentrated sulfuric acid and graphite powder mixed solution and join in the concentrated sulfuric acid and graphite powder mixed solution, stir for 10-15mins,

[0036] A3. Finally, the weight ratio of the mixed solution ob...

Embodiment 1

[0049] 1. Low temperature reaction: 20-23ml of concentrated sulfuric acid (98%), stirred in an ice-water bath for 5-8mins, added 1000mg of graphite powder, reacted for 15-20mins, added 0.5-0.9g of sodium nitrate, mixed for 10-15mins, 3000mg high Potassium manganate was added slowly to prevent the temperature from rising suddenly, and stirred for 80-100mins, and the above steps were all in ice water bath.

[0050] 2. Medium temperature reaction: heat up, water bath temperature is about 35-36°C, and react for 30-50mins

[0051] 3. High temperature reaction: Add 40-50ml deionized water, add dropwise, then raise the temperature to 90-100°C, stir for 30-40mins, add 10-15ml hydrogen peroxide dropwise, stir for 10-20mins, wait for the solution after reaction Cool, add deionized water, let stand, remove supernatant

[0052] 4. Repeat the centrifugation of the solution obtained in 3 for 5-6 times, the rotating speed is 13000-15000rpm, the time of each centrifugation is 10-15mins, and ...

Embodiment 2

[0061] The difference between this embodiment and Example 1 is that in step 7, the water bath is at 90° C. for 2 hours, and the others are the same as Example 1.

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Abstract

The invention discloses a method for preparing a gold nano particle and grapheme composite material through fast reduction. The method specifically comprises the steps of 1, preparing reduced grapheme oxide water solution by taking sodium borohydride as a reducer; 2, adding gold chloride acid in the reduced grapheme oxide water solution, and obtaining the gold nano particle and grapheme composite material in an in-situ reduction way by utilizing the reducibility of the grapheme through ultrasonic action under normal temperature; 3, centrifugally washing the obtained solution by using de-ionized water for multiple times so as to obtain the gold nano particle and grapheme composite material of which the dimension is uniform and the distribution is uniform. The method disclosed by the invention has the advantages that the technology is simple, the preparation period is short, the repeatability is strong, environment protection is realized, and a composite product is uniform and stable; the prepared gold nano particle and grapheme composite material has good stability in water solution and is not easy to reunite, and meanwhile, the method has the characteristics of multiple reaction active sites, large specific surface area, good biocompatibility, electric conduction and the like; the method has a wide application prospect in aspects of catalyzing, sensing, environment protection, SERS (Surface Enhanced Raman Scattering) and the like.

Description

technical field [0001] The invention relates to a preparation method of reduced graphene oxide sheets, gold nanoparticles and their composite materials, and belongs to the technical field of material chemical preparation. Background technique [0002] With the unique surface effect, small size effect and quantum size effect of nanomaterials, gold nanoparticles exhibit different physical and chemical properties from macroscopic materials, and enhance Raman scattering, catalysis, sensing, biomarking, optoelectronics, etc. on the surface. It has wide application value in many fields. But at the same time, due to the large surface energy of nanoparticles, there are problems such as poor stability and easy agglomeration. Therefore, finding a suitable substrate and preparing metal nanoparticle composite materials has become an effective way to exert the effect of gold nanoparticles. [0003] Graphene is made of carbon atoms with sp 2 A two-dimensional crystal material composed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00
Inventor 郭新立王蔚妮张灵敏郝威张艳娟李琦于金
Owner SOUTHEAST UNIV
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