Journal
ACS NANO
Volume 8, Issue 12, Pages 12874-12882Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn506610p
Keywords
capacitive touch sensor; transparent composite electrode; self-healing; silver nanowire
Categories
Funding
- Air Force Office of Scientific Research [FA9550-12-1-0074]
- China Scholarship Council Program
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A healable transparent capacitive touch screen sensor has been fabricated based on a healable silver nanowire-polymer composite electrode. The composite electrode features a layer of silver nanowire percolation network embedded into the surface layer of a polymer substrate comprising an ultrathin soldering polymer layer to confine the nanowires to the surface of a healable Diels-Alder cycloaddition copolymer and to attain low contact resistance between the nanowires. The composite electrode has a figure-of-merit sheet resistance of 18 Omega/sq with 80% transmittance at 550 nm. A surface crack cut on the conductive surface with 18 Omega is healed by heating at 100 degrees C, and the sheet resistance recovers to 21 Omega in 6 min. A healable touch screen sensor with an array of 8 x 8 capacitive sensing points is prepared by stacking two composite films patterned with 8 rows and 8 columns of coupling electrodes at 90 degrees angle. After deliberate damage, the coupling electrodes recover touch sensing function upon heating at 80 degrees C for 30 s. A capacitive touch screen based on Arduino is demonstrated capable of performing quick recovery from malfunction caused by a razor blade cutting. After four cycles of cutting and healing, the sensor array remains functional.
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