Solvothermal synthesis of ultra-fine silver nanowires with a diameter about 20 nm and an aspect ratio approximately 2000 for highly conductive flexible transparent film
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Flexible transparent conductive films (TCFs) based on silver nanowires (AgNWs) networks have been widely researched as an alternative to indium tin oxide (ITO) for optoelectronic devices. However, AgNW-based TCFs still involve issues such as high haze and poor transmittance for practical application. The innovation point of our work is the synthesis of ultra-fine and high aspect ratio AgNWs, and they are developed to prepare high-performance AgNW-based TCFs. In this study, a rapid and rationally designed method to synthesize ultra-fine AgNWs through dual ionic assistants assisted has been explored. As a result, the as-synthesized AgNWs have a uniform ~ 20 nm diameter, and a high aspect ratio of 2000, which are the minimum diameter and maximum aspect ratio among the values reported previously for solvothermal-processed AgNWs. A highly transparent and bendable AgNW-based conductive film shows a 97.71% transmittance and a haze of 1.49% under the condition of disregarding the transmittance and haze of bare PET substrate. The sheet resistance (Rsheet) of the resulting AgNW-based conductive film is ~ 15 Ω sq–1. Most importantly, the AgNW-based conductive film exhibits strong adhesion to the substrate. The advanced and wide-ranging features of the as-prepared AgNW-based conductive film greatly contribute to its use as a transparent conductive film in multifunctional flexible optoelectronic devices.
This work was supported by National Natural Science Foundation of China (Grant No. 21761016), Young and Middle-aged Academic and Technical Leaders Reserve Talents Program of Yunnan Province (Grant No. 2017HB060), Applied Basic Research Foundation of Yunnan Province (Grant Nos. 2016FD126, 2017FB142), Major R&D Project of Yunnan Province (Grant No. 2018ZE001), Research Foundation of Key New Products of Yunnan Province (Grant No. 2016BA007), and Research Foundation of Institute of Yunnan Province (Grant No. 2016DC033).