Liu Guozhen, Wang Jun, Ge Yahao, Wang Yuejin, Lu Shiqiang, Zhao Yang, Tang Yan, Soomro Abdul Majid, Hong Qiming, Yang Xiaodong, Xu Fuchun, Li Sensen, Chen Lu-Jian, Cai Duanjun, Kang Junyong
Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center of OSED, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China.
Department of Electronic Engineering, School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China.
ACS Nano. 2020 Jun 23;14(6):6761-6773. doi: 10.1021/acsnano.0c00109. Epub 2020 May 21.
The copper nanowire (Cu NW) network is considered a promising alternative to indium tin oxide as transparent conductors for advanced optoelectronic devices. However, the fast degradation of copper in ambient conditions largely overshadows its practical applications. Here we demonstrate a facile method for epitaxial growth of hexagonal boron nitride (h-BN) of a few atomic layers on interlaced Cu NWs by low-pressure chemical vapor deposition, which exhibit excellent thermal and chemical stability under high temperature (900 °C in vacuum), high humidity (95% RH), and strong base/oxidizer solution (NaOH/HO). Meanwhile, their optical and electrical performances remain similar to those of the original Cu NWs (.., high optical transmittance (∼93%) and high conductivity (60.9 Ω/□)). A smart privacy glass is successfully fabricated based on a Cu@h-BN NW network and liquid crytal, which could rapidly control the visibility from transparent to opaque (0.26 s) and, at the same time, strongly block the mid-infrared light for energy saving by screening radiative heat. This precise engineering of epitaxial Cu@h-BN core-shell nanostructure offers broad applications in high-performance electronic and optoelectronic devices.
铜纳米线（Cu NW）网络被认为是一种很有前途的替代铟锡氧化物的透明导体，可用于先进的光电器件。然而，铜在环境条件下的快速降解在很大程度上掩盖了其实际应用。在此，我们展示了一种通过低压化学气相沉积在交错的Cu NWs上外延生长几层原子厚的六方氮化硼（h-BN）的简便方法，这些h-BN在高温（真空中900°C）、高湿度（95%RH）和强碱/氧化剂溶液（NaOH/HO）下表现出优异的热稳定性和化学稳定性。同时，它们的光学和电学性能与原始Cu NWs相似（即高光学透过率（~93%）和高电导率（60.9Ω/□））。基于Cu@h-BN NW网络和液晶成功制备了一种智能隐私玻璃，它可以快速控制透明度从透明变为不透明（0.26秒），同时通过屏蔽辐射热强烈阻挡中红外光以实现节能。这种外延Cu@h-BN核壳纳米结构的精确工程在高性能电子和光电器件中具有广泛应用。
