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Facile Preparation of Cu/Ag Core/Shell Electrospun Nanofibers as Highly Stable and Flexible Transparent Conductive Electrodes for Optoelectronic Devices
journal contribution
posted on 2019-02-14, 00:00 authored by Dai-Hua Jiang, Ping-Chun Tsai, Chi-Ching Kuo, Fu-Cheng Jhuang, Hao-Cheng Guo, Shih-Pin Chen, Ying-Chih Liao, Toshifumi Satoh, Shih-Huang TungNovel transparent
conductive electrodes (TCEs) with copper (Cu)/silver
(Ag) core/shell nanofibers (NFs) containing random, aligned, and crossed
structures were prepared using a combination of electrospinning (ES)
and chemical reduction. The ES process was used to prepare continuous
copper nanofibers (Cu-NFs), which were used as core materials and
were then immersed in silver ink (Ag ink) to form a protective layer
of Ag to protect the Cu-NFs from oxidation. The Ag shell layer protected
the Cu-NFs against oxidation and enhanced their conductivity. Such
Cu/Ag core/shell webs can be easily transferred on the flexible matrix
and can be applied in TCEs. The metal NF webs of different structures
exhibited various degrees of conductivity and followed the order random
type > crossed type > aligned type; however, the order with
respect
to transmittance (T) was inverse. The aligned nanowire
networks exhibited a high T of over 80%, and the
random ones exhibited a low sheet resistance of less than 102 Ω/sq (the best value is 7.85 Ω/sq). The present study
demonstrated that TCEs based on Cu/Ag core/shell NF webs have considerable
flexibility, transparency, and conductivity and can be applied in
novel flexible light-emitting diode devices and solar cells in the
future.
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