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Printable elastic conductors by in situ formation of silver nanoparticles from silver flake

Naoji Matsuhisa1, Daishi Inoue2, Peter Zalar1,3†, Hanbit Jin1, Yorishige Matsuba1,3, Akira Itoh1,3,Tomoyuki Yokota1,3, Daisuke Hashizume2 and Takao Someya1,2,3,4*



In this composite, Ag flakes are used as a cost-competitive conducting filler. Scanning electron microscopy (SEM) images and the size distribution of Ag flakes are available in Supplementary

Figs 1 and 2, respectively. The fluorine rubber was chosen for its stretchability, environmental stability, and high polarity to attract ions32. The fluorine-rubber-compatible surfactant is a nonionic polymeric surfactant consisting of a hydrophilic ethyleneoxide group and a fluorophyllic perfluoroalkyl group. MIBK is an organic solvent used to dissolve the fluorine rubber. The ink’s viscosity is 14.5 Pa s at a shear rate of 10 s−1 (Supplementary Fig. 3). This viscosity is suitable for stencil, screen, and dispenser printing methods. After printing, traces are dried at 80 ◦C for 1 h, followed by additional heating at 120 ◦C for 1 h, which is critical for the formation of AgNPs as described below.

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