Preparation method for gold-copper bimetal nanospheres

Abstract

Disclosed is a preparation method for gold-copper bimetal nanospheres. The present invention is characterized by adding halide into a reaction system to obtain novel metal bimetallic nanospheres via the reduction of sodium borohydride by taking water as a solvent, metal inorganic salts as raw materials, and polyvinyl pyrrolidone (PVP) as a protective agent at normal temperature and pressure. The gold-copper bimetal nanospheres will have an important role in the field of catalysis. The method has the characteristics of readily available raw materials, simple equipment and technology, safe and reliable operations, relatively high yield, etc.

Description

technical field [0001] The invention relates to a preparation method of a novel gold-copper bimetal nanosphere. Background technique [0002] Due to the characteristics of small size, large specific surface area, quantum size effect and macroscopic quantum tunneling effect, gold and copper single-metal nanomaterials and their bimetallic nanomaterials exhibit unique electrical, magnetic, optical and chemical properties, and are in Biosensors, photochemistry, optoelectronic devices, and catalysis have broad application prospects. Therefore, in recent years, the research on the preparation, performance, and application of gold-copper nanomaterials has been widely concerned by researchers at home and abroad. [0003] At present, there are various preparation methods for nanospheres, which can be roughly divided into gas phase method, liquid phase reduction method and mechanical mixing method. Among them, the liquid phase reduction method has been studied the most, and the repres...

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Problems solved by technology

[0004] Recently, some research groups have tried and explored methods for preparing gold-copper bimetallic nanomaterials, mainly liquid-phase reduction methods. For example, Raymond E. Schaak’s group can obtain nanoparticles with smaller particle sizes through water-phase reduction methods. However, the yield of nanoparticles is relatively low and is not suitable for large-scale production (see Amandeep K. Sra; Raymond E. Schaak, J. Am. Chem. Soc. 2004, 126, 6667-6672); Jordi Llorca et al. Gold-copper nanoparticles of <2nm can be prepared by this method, but the further application of this method is also limited due to the introduction of sulfur element in this method (see Jordi Llorca; Montserrat Domínguez et al, J. Catal. 2008, 258, 187 -198); Professor Li Yadong of Tsinghua University obtained spherical gold-copper nanocrystals <10nm by seed crystal diffusion method, which can control the particle size and dispersion of nanoparticles well, but the synthesis process requires high temperature and synthesis The process needs to be carried out in two steps, which is cumbersome (see Wei Chen; Yadong Li et al, Angew. Chem. Int. Ed. 2010, 49, 2917-2921); Liu et al. prepared the particle size by one-step high-temperature pyrolysis reduction and gold-copper nanocubes with controllable composition, but this method uses copper acetylacetonate as a reactant, which is highly toxic and expensive, and a variety of protective agents need to be added during the synthesis process, which makes the cost of preparing nanocrystals higher, so it is also Not conducive to popularization (see Yonglin Liu; A. R. Hight Walker, Angew. Chem. Int. Ed. 2010, 49, 6781-6785)

Although the research on gold-copper bimetallic nanomaterials has made good progress, it is still a great challenge to find a simple, green and economical chemical process to prepare gold-copper bimetallic nanomaterials.

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