posted on 2019-02-21, 18:45authored byBowen Zhang, Wanli Li, Jinting Jiu, Yang Yang, Jiangbo Jing, Katsuaki Suganuma, Cai-Fu Li
Copper
nanowires (CuNWs) are considered a promising alternative to indium
tin oxide due to their cost-effectiveness as well as high conductivity
and transparency. However, the practical applications of copper-based
conductors are greatly limited due to their rapid oxidation in atmosphere.
Herein, a facile adsorption and decomposition process is developed
for galvanic replacement free and large-scale synthesis of highly
stable Cu@Ag core–shell nanowires. First, Ag-amine complex
([Ag(NH2R)2]+) as silver source adsorbs
on CuNWs surface, and Cu@Ag-amine complex core–shell structure
is formed. After that, Ag-amine complex is easily decomposed to pure
Ag shell through a simple thermal annealing under air. By adjusting
the concentration of Ag-aminein CuNWs solution, Cu@Ag core–shell
nanowires with different thickness of silver shell can be easily obtained.
The obtained core–shell nanowires exhibit high stability for
at least 500 h at high temperature (140 °C) and high humidity
(85 °C, 85% RH) due to the protection of Ag shell. More importantly,
the conductivity and transparency of Cu@Ag nanowires-based conductors
is similar to that of pure CuNWs. The large-scale and facile synthesis
of Cu@Ag core–shell nanowires provides a new method to prepare
stable metallic core–shell nanowires.