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Standing Enokitake-like Nanowire Films for Highly Stretchable Elastronics
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posted on 2018-09-18, 00:00 authored by Yan Wang, Shu Gong, Stephen J. Wang, Xinyi Yang, Yunzhi Ling, Lim Wei Yap, Dashen Dong, George P. Simon, Wenlong ChengStretchable electronics
may enable electronic components to be
part of our organsideal for future wearable/implantable biodiagnostic
systems. One of key challenges is failure of the soft/rigid material
interface due to mismatching Young’s moduli, which limits stretchability
and durability of current systems. Here, we show that standing enokitake-like
gold-nanowire-based films chemically bonded to an elastomer can be
stretched up to 900% and are highly durable, with >93% conductivity
recovery even after 2000 stretching/releasing cycles to 800% strain.
Both experimental and modeling reveal that this superior elastic property
originates from standing enokitake-like nanowire film structures.
The closely packed nanoparticle layer sticks to the top of the nanowires,
which easily cracks under strain, whereas the bottom part of the nanowires
is compliant with substrate deformation. This leads to tiny V-shaped
cracks with a maintained electron transport pathway rather than large
U-shaped cracks that are frequently observed for conventional metal
films. We further show that our standing nanowire films can serve
as current collectors in supercapacitors and second skin-like smart
masks for facial expression detection.
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nanoparticle layer sticksenokitake-like nanowire film structuresexpression detectionnanowire filmsbottom partsubstrate deformationEnokitake-like Nanowire Filmselectron transport pathwayenokitake-like gold-nanowire-based filmslimits stretchabilitymetal filmsstrainV-shaped cracksU-shaped cracksStretchable Elastronics Stretchable electronics
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