Department of Chemistry, University of California , Berkeley, California 94720, United States.
California Research Alliance by BASF, University of California , Berkeley, California 94720, United States.
ACS Nano. 2016 Feb 23;10(2):2600-6. doi: 10.1021/acsnano.5b07651. Epub 2016 Jan 28.
Copper nanowire (Cu NW) based transparent conductors are promising candidates to replace ITO (indium-tin-oxide) owing to the high electrical conductivity and low-cost of copper. However, the relatively low performance and poor stability of Cu NWs under ambient conditions limit the practical application of these devices. Here, we report a solution-based approach to wrap graphene oxide (GO) nanosheets on the surface of ultrathin copper nanowires. By mild thermal annealing, GO can be reduced and high quality Cu r-GO core-shell NWs can be obtained. High performance transparent conducting films were fabricated with these ultrathin core-shell nanowires and excellent optical and electric performance was achieved. The core-shell NW structure enables the production of highly stable conducting films (over 200 days stored in air), which have comparable performance to ITO and silver NW thin films (sheet resistance ∼28 Ω/sq, haze ∼2% at transmittance of ∼90%).
基于铜纳米线（Cu NW）的透明导体有望取代 ITO（铟锡氧化物），因为铜具有高导电性和低成本。然而，Cu NW 在环境条件下性能相对较低且稳定性差，限制了这些器件的实际应用。在这里，我们报告了一种基于溶液的方法，在超薄铜纳米线表面包裹氧化石墨烯（GO）纳米片。通过温和的热退火，GO 可以被还原，并且可以获得高质量的 Cu r-GO 核壳 NWs。使用这些超薄核壳纳米线制备了高性能透明导电薄膜，并实现了优异的光学和电学性能。核壳 NW 结构使高稳定性导电薄膜的生产成为可能（在空气中储存超过 200 天），其性能可与 ITO 和银 NW 薄膜相媲美（方阻约 28 Ω/sq，雾度约 2%，透光率约 90%）。
