Low-temperature self-welding method of carbon-coating copper nanowires

Abstract

The invention discloses a low-temperature self-welding method of carbon-coating copper nanowires, and relates to the field of nano welding. According to the technical scheme of the welding method, the copper nanowires wrapped with carbon shells and provided with five-fold twinned crystal structures are synthesized through a hydrothermal method. When the copper nanowires are in lap joint to form point contact and heated under a low-vacuum condition to 40-70% of a bulk copper melting point, namely 300-725 DEG C, copper atoms diffuse and are accumulated at contact points through a channel formed by the carbon shells, and accordingly under the condition that no other welding flux is used, self-welding is achieved, and the effect that the copper nanowires are connected is achieved. The nano welding technology has the advantages that work temperature is low, flow speed is high, the range is adjustable, welding can be achieved at multiple points on a large scale at the same time, no welding flux is needed, and pollution is not caused. Tests prove that welding points have excellent mechanical and electric characteristics, and the method is expected to be widely used in the fields of flexible electronic systems, semiconductor integrated circuits, micro-nano electronic packaging, transparent electrodes and the like.

Description

technical field [0001] The invention relates to the technical field of nano-welding, in particular to a low-temperature self-welding method for carbon-coated copper nanowires. Background technique [0002] Nanomaterials have attracted widespread attention due to their unique optical, electrical, magnetic and other physical properties. Scientists and engineers have controllably prepared a variety of nanomaterials through various synthetic methods. However, if these nanomaterials are to be formed with a certain structure And functional devices, these materials must be assembled using certain welding techniques. However, because the traditional macroscopic welding method cannot operate on nanoscale materials, nano-welding technology has become a hot and difficult issue in the field of nano-scale research. [0003] At present, there are three main types of connection technologies at the nanometer scale, namely electron beam / ion beam assisted deposition (EBID / IBID), nano fusion ...

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly aims at the shortcomings and deficiencies in the field of nano-welding technology at present, and proposes a low-temperature self-welding method of carbon-coated copper nanowires based on the diffusion phenomenon of copper atoms after heating. The method has the advantages of low working temperature and large flow rate. Adjustable, high solder utilization rate and large-scale multi-point simultaneous welding, etc., are expected to be widely used in flexible electronic systems, semiconductor integrated circuits, micro-nano electronic device packaging, transparent electrodes and other fields

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