Fractal dendrite-based electrically conductive composites for laser-scribed flexible circuits

Nature Communications
Cheng YangChing-Ping Wong

Abstract

Fractal metallic dendrites have been drawing more attentions recently, yet they have rarely been explored in electronic printing or packaging applications because of the great challenges in large-scale synthesis and limited understanding in such applications. Here we demonstrate a controllable synthesis of fractal Ag micro-dendrites at the hundred-gram scale. When used as the fillers for isotropically electrically conductive composites (ECCs), the unique three-dimensional fractal geometrical configuration and low-temperature sintering characteristic render the Ag micro dendrites with an ultra-low electrical percolation threshold of 0.97 vol% (8 wt%). The ultra-low percolation threshold and self-limited fusing ability may address some critical challenges in current interconnect technology for microelectronics. For example, only half of the laser-scribe energy is needed to pattern fine circuit lines printed using the present ECCs, showing great potential for wiring ultrathin circuits for high performance flexible electronics.

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Citations

Apr 11, 2018·Biomedical Materials·Katarzyna KrukiewiczManus Biggs
Feb 27, 2020·Soft Matter·Sylvie KwokBernard Cabane
May 26, 2018·ACS Applied Materials & Interfaces·You MengFukai Shan
Dec 29, 2017·Journal of the American Chemical Society·Suyong ShinTae-Lim Choi
Jul 17, 2020·ACS Applied Materials & Interfaces·Yiming ChenShaohua Jiang

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Methods Mentioned

BETA
scanning electron microscopy
transmission
X-ray
electron diffraction
surface plasmon resonance

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