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Seeds screening aqueous synthesis, multiphase interfacial separation and in-situ optical characterization of invisible ultrathin silver nanowires

Abstract

We report a multi-step synthetic method to obtain ultrathin silver nanowires (Ag NWs) with diameter average ~ 17 nm and part of them decreased down to 9 nm in aqueous different from mainstream polyol process. Carefully designed seed screening processes including LED irradiation at high temperature and continuous H2O2 etching, and relative growth mechanisms of high-yield five-twinned pentagonal seeds and ultrathin Ag NWs in aqueous environment were elucidated. Then, a rapid and simple multiphase interfacial assembly method particularly suitable for the separation of ultrathin Ag NWs from various by-products was demonstrated with clearly mechanism explanation. Next, unique optical interaction between light and individual AgNWs as well as feature structures in AgNWs film was investigated by micro-domain optical confocal microscope measurement in-situ together with theoretical explanation using modal transmission theory. It revealed that the haze problem of AgNWs film is not only arising from the interaction between light and individual or crossed Ag NWs but also greatly dependent on the weak coupling effect of leaky modes supported by adjacent AgNWs with large distance which has not been considered before. We then provided directly experimental evidence and concluded how to obtain haze-free films with 100% transparency in the whole visible range based on ultrathin AgNWs. This breakthrough in the diameter confinement and purification of Ag NWs is a highly expected step to overcome the well-focused light diffusion and absorption problems of Ag NWs based devices applying for various fields such as flexible electronics, high-clarity displays, visible transparent heaters, photovoltaics and various optoelectronic technologies.

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Supplementary files

Publication details

The article was received on 04 Apr 2018, accepted on 04 Jun 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR02736F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Seeds screening aqueous synthesis, multiphase interfacial separation and in-situ optical characterization of invisible ultrathin silver nanowires

    X. Zhang, X. Xue, H. Zhou, N. Zhao, F. Shan, D. Su, Y. Liu and T. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02736F

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