nn0c00109_si_002.mp4 (4.1 MB)
Download fileCu Nanowires Passivated with Hexagonal Boron Nitride: An Ultrastable, Selectively Transparent Conductor
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posted on 2020-06-12, 15:07 authored by Guozhen Liu, Jun Wang, Yahao Ge, Yuejin Wang, Shiqiang Lu, Yang Zhao, Yan Tang, Abdul Majid Soomro, Qiming Hong, Xiaodong Yang, Fuchun Xu, Sensen Li, Lu-Jian Chen, Duanjun Cai, Junyong KangThe
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/H2O2). Meanwhile, their optical and electrical performances remain similar
to those of the original Cu NWs (e.g., 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.