A kind of preparation method of sheet graphene single/multi-loaded noble metal nanoparticles

A technology of flake graphite and nano-particles, which is applied in the field of preparation of inorganic nano-materials to achieve the effects of low cost, strong repeatability and wide adjustable range

Active Publication Date: 2017-07-18
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the same experimental system, by changing the experimental raw materials and conditions, there is no report on the preparation method of one or more nano-metal particles supported by flake graphene.

Method used

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  • A kind of preparation method of sheet graphene single/multi-loaded noble metal nanoparticles
  • A kind of preparation method of sheet graphene single/multi-loaded noble metal nanoparticles
  • A kind of preparation method of sheet graphene single/multi-loaded noble metal nanoparticles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 100 mg graphene oxide was ultrasonically dispersed in 100 ml water to form a stable suspension. Then add 30ml of chloroauric acid solution with a concentration of 0.5mmol / L, and stir rapidly so that the above-mentioned solutions are mixed evenly. After adding 4 g of ascorbic acid as a reducing agent, the solution was transferred to a 200 ml beaker for 5 hours in an ultrasonic constant temperature water bath. After the water bath is finished, the precipitated product is dried to obtain a composite material of sheet-like graphene supported gold nanoparticles.

[0016] Scanning electron microscope characterization results (eg figure 1 ) shows that the gold nanoparticles obtained by reduction are in the shape of microspheres with a diameter of about 100nm, and the dispersion of gold nanoparticles is good.

Embodiment 2

[0018] 140 mg graphene oxide was ultrasonically dispersed in 100 ml water to form a stable suspension. Then add 5ml of silver-ammonia solution with a concentration of 2mmol / L, and stir rapidly so that the above-mentioned solution is mixed evenly. After adding 3g of sodium borohydride as a reducing agent, the solution was transferred to a 200ml beaker and subjected to an ultrasonic constant temperature water bath for 2 hours. After the water bath is finished, the precipitated product is dried to obtain a composite material of sheet-like graphene loaded with silver nanoparticles.

[0019] Scanning electron microscope characterization results (eg figure 2 ) showed that the reduced silver nanoparticles were irregular, and some silver nanoparticles were agglomerated, with a diameter of about 50-80nm.

Embodiment 3

[0021] 80 mg graphene oxide was ultrasonically dispersed in 100 ml water to form a stable suspension. Then add 20 ml of palladium acetate solution with a concentration of 1 mmol / L, and stir rapidly so that the above-mentioned solutions are mixed evenly. After adding 6g of ammonium citrate as a reducing agent, the solution was transferred to a 200ml beaker for 3 hours in an ultrasonic constant temperature water bath. After the water bath is finished, the precipitated product is dried to obtain a composite material of sheet-like graphene-loaded palladium nanoparticles.

[0022] Scanning electron microscope characterization results ( image 3 ) shows that the palladium nanoparticles obtained by reduction are in the shape of microspheres, and are very uniformly dispersed on the surface of graphene, evenly distributed, and the particle size is relatively uniform, about 70-100nm.

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Abstract

The invention relates to a method for preparing sheet-shaped graphene single / multiple-loaded precious metal nanoparticles. Add 0.5-2 mmol liquid-phase precious metal sources to an aqueous solution dispersed with 80-140 mg of graphene oxide, stir rapidly to make them evenly mixed; then add A reducing agent with a mass ratio of 5 to 15:1 to the precious metal, the volume ratio of the liquid-phase precious metal source to the total volume of the reaction solution is 5 ml / 100 ml to 30 ml / 100 ml; then the suspension is transferred to a suitable container for ultrasonic constant temperature Water bath; after the water bath is over, the precipitated product is washed and dried to obtain sheet-like graphene single / multi-loaded noble metal nanoparticles. The preparation method has simple process and process, wide adjustable range of parameters, strong repeatability and low cost, and can prepare various flake graphene composite materials loaded with different metal nanoparticles.

Description

technical field [0001] The invention relates to a preparation method capable of controlling the crystal form and morphology of titanium-based nanomaterial products, and belongs to the technical field of inorganic nanomaterial preparation. Background technique [0002] Graphene is currently one of the most promising materials in the world, with a staggering 2630m2 surface area 2 / g, while having excellent electrical properties, excellent mechanical properties and stable thermal properties, so many properties make graphene a hot research object in the field of materials science in recent years. However, due to better biocompatibility and unique quantum properties brought about by special shape and small size, flake graphene has high hopes and is expected to be used in supercapacitors, solar cells, and biological material detection. etc. play a big role. Since Ruoff et al. reported the first graphene composite material in 2006, researchers have gradually turned their attentio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 何丹农林琳冉伟许晓玉王蒙
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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