Silver-copper nano alloy and electrosynthesis method thereof

Abstract

The invention discloses a silver-copper nano alloy and an electrosynthesis method thereof. The silver-copper nano alloy comprises Ag and Cu; the molar components of Ag and Cu are shown as a formula of xAg-(1-x)Cu, wherein x=0.5-0.9; the phase of the alloy is a face-centered cubic structure silver single phase solid solution; the (111) diffraction peak of the alloy is consistent with the (111) diffraction peak of pure metal Ag; and the alloy has a surface plasma resonance peak and has a dendritic shape, the secondary dendrite arm spacing is 100 to 300nm, and the tertiary dendrite arm length is 100 to 500nm. The silver-copper nano alloy with the dendritic structure is grown under constant potential. Electrolyte for preparation does not contain any surfactant molecules. The surface plasma resonance frequency of the alloy is modulated by controlling components of the alloy, and along with the increase of the silver content in the silver-copper alloy, the plasma absorption peak of the alloy generates red shift. The formed silver-copper nano dendrite has a rough and clean surface and a large specific surface area, and is better applied to the aspects such as surface enhanced spectrums, surface plasma optical catalysis, surface plasma enhanced solar absorption and the like.

Description

technical field [0001] The invention belongs to the field of metal functional materials, in particular to a silver-copper nano-alloy without surfactant and a capillary force-induced electrochemical synthesis method thereof. Background technique [0002] Silver-copper nanoalloys have surface plasmon resonance (surface plasmon resonance, SPR) activity, while keeping the size of nanoparticles constant, the surface plasmon resonance wavelength can be modulated by composition. At present, there are three main methods for the preparation of silver-copper nano-alloys: [0003] The first is the electrochemical synthesis reaction with the help of various surfactant molecules, such as in patent 200910022693.3, adding polyethylene glycol-10000 to the electrolyte, using a three-electrode electrolytic cell, and using a constant potential method on an ITO glass plate However, there is a layer of organic molecules on the surface of the silver-copper nano-alloy prepared by this method. ...

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Problems solved by technology

[0008] In order to overcome the shortcomings existing in the prior art or its application is limited, or the ratio of Ag and Cu cannot be directly adjusted, or the preparation process is complicated, the cost is high, and the large-scale industrial application cannot be satisfied, the present invention proposes a silver-copper Nano alloy and its electrosynthesis method

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