Preparation method for graphene-supported metal nanoparticle compound

Abstract

The invention discloses a preparation method for a graphene-supported metal nanoparticle compound. The method comprises the following steps of: preparing metal nanoparticles with uniform size through controllable synthesis; uniformly supporting the metal nanoparticles on graphene oxide through adsorption; and catalyzing NaBH4 at normal temperature to reduce the graphene oxide by taking the metal nanoparticles as a catalyst so as to obtain the graphene-supported metal nanoparticle compound. By using the method provided by the invention, the compounds with strong toxicity and volatility such as hydrazine hydrate and derivatives thereof are prevented from being used as reducing agents to prepare the graphene-supported metal nanoparticle compound; the method has the characteristics of environmental friendliness, safety and the like; meanwhile, the method can be performed under the conditions of room temperature and different acid-base (pH) conditions with mild reaction conditions. Through the method, various noble metals and transition metal nanoparticles can be supported on the graphene, and some metal oxides for catalyzing decomposition of NaBH4 can also be supported.

Description

technical field [0001] The invention relates to the technical field of nanocomposite material preparation, in particular to a method for preparing a graphene-loaded metal nanoparticle composite. Background technique [0002] Graphene-supported metal nanoparticle composites have excellent catalytic ability, outstanding electrical conductivity and optical properties, and can be widely used in many fields such as sensors, photovoltaic cells, and organic synthesis catalysts. [0003] Hummer, Brodie, Staudenmaier and other methods can prepare graphene oxide on a large scale, and then reduce it to obtain graphene by adding reducing agents such as hydrazine hydrate and benzylamine under heating conditions. At present, there are mainly two methods to prepare graphene-loaded metal nanoparticle composites. One is to mix the precursors of graphene oxide and metal ions uniformly, and then add a reducing agent to synthesize graphene-loaded metal nanoparticle composites in one step. One ...

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Problems solved by technology

At present, there are mainly two methods to prepare graphene-loaded metal nanoparticle composites. One is to mix the precursors of graphene oxide and metal ions uniformly, and then add a reducing agent to synthesize graphene-loaded metal nanoparticle composites in one step. One method is simple and fast, but the structure and morphology of the prepared metal nanoparticles are difficult to control, which affects the properties of the composite; the other is to reduce graphene oxide and metal ion precursors in two steps, and prepare graphene-loaded metals by adsorption. Nanoparticle composites, this method is more complicated, but it can effectively control the structure and morphology of metal nanoparticles, and give full play to the excellent performance of graphene-supported metal nanoparticle composites

[0004] Prior to the present invention, previous work mainly used hydrazine hydrate and its derivatives as reducing agents to prepare graphene-loaded metal nanoparticle composites, but hydrazine hydrate and its derivatives have strong toxicity and volatility, and cannot be used For large-scale use, and the prepared complex will be doped with a lot of nitrogen atoms, which will affect the physical and chemical properties of the complex

In the past two years, there have also been reports in the literature that ascorbic acid (VC), sodium borohydride (NaBH 4 ), polydiallyldimethylammonium chloride (PDDA), etc. as reducing agents to prepare graphene-loaded metal nanoparticle composites, but these reactions must be carried out at high temperatures, the reactions are more violent, and it is easy to increase the graphene Defects

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