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Unraveling the Solvent Induced Welding of Silver Nanowires for High Performance Flexible Transparent Electrodes

Abstract

Solution processed metal nanowire network is promising flexible transparent electrode to replace brittle metal oxides for printable optoelectronics applications, but suffers from the issue of pseudo contact between nanowires. Herein, using volatile solvent mists as powerful “zipper”, we demonstrate a simple and rapid method to effectively weld silver nanowires, which dramatically improves the conductivity and robustness of the silver nanowires network based flexible transparent electrodes. We reveal that for stacked network structure, the unique wedge-shaped nanogaps between long nanowires and substrate provide a strong capillary force during the solvent evaporation, which is much larger than that between zero-dimensional nanoparticles and gives a decisive contribution for nanowires junction welding, and this nanowire-substrate interplay force is positively related to the wettability of the substrate. At the same time, the dissolution-reprecipitation of the capping agent on the silver nanowires surface as the natural adhesive can fix the network on the substrate tightly, which enhances the robustness of the network. Our approach solves two key issues in solution-processed transparent electrodes in one simple step, and is compatible with various mild solution-processed optoelectronic devices, especially those contain heat-sensitive or chemical-sensitive materials. Moreover, a new type of invisible infrared encryption display is demonstrated based on this approach.

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Supplementary files

Publication details

The article was received on 27 Feb 2018, accepted on 11 Apr 2018 and first published on 12 Apr 2018


Article type: Communication
DOI: 10.1039/C8NR01648H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Unraveling the Solvent Induced Welding of Silver Nanowires for High Performance Flexible Transparent Electrodes

    K. Zhang, J. Li, Y. Fang, B. Luo, Y. Zhang, Y. Li, J. Zhou and B. Hu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01648H

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