High-Resolution Printable and Elastomeric Conductors from Strain-Adaptive Assemblies of Metallic Nanoparticles with Low Aspect Ratios

Author:Date:2021-12-14Views:31

论文题目:High-Resolution Printable and Elastomeric Conductors from Strain-Adaptive Assemblies of Metallic Nanoparticles with Low Aspect Ratios

论文作者:Yu Kang, Guoqi Wang, Sanchuan Zhao, Jiaye Li, Lu Di, Yang Feng, Jun Yin, Jian Zhu*

发表期刊:Small, 16(50), 2004793, 2020    

Abstract: 

Stretchable conductors capable of precise micropatterning are imperative  for applications in various wearable technologies. Metallic  nanoparticles with low aspect ratios and miniscule sizes are preferred  over metallic nanowires or nanoflakes for such applications. However,  nanoparticles tend to lose mutual contact during stretching. Therefore,  they are rarely used alone in stretchable conductors. In this study,  electronic inks comprising silver nanoparticles (AgNPs) for the  high-resolution printing of stretchable conductors are reported. AgNPs  are synthesized using aqueous polyurethane micelles, which are  subsequently disentangled into polymeric chains in isopropanol to  stabilize the inks. The ink rheology can be arbitrarily tuned to allow  direct-write printing with a minimum feature width of 3 mu m. Owing to  the absence of extra surfactants, direct drying of such inks at room  temperature provides the stretchable conductors with an initial  conductivity of 8846 S cm(-1) and conductivity of 1305 S cm(-1) at 100%  strain. This enhanced performance is attributed to the conductive  percolations through assemblies of AgNPs adapting to the strain and is  equivalent to those of stretchable conductors filled with Ag nanowires  or flakes. These inks are promising for the scalable fabrication of  highly integrated stretchable electronics.

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