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Proceedings Paper

Crumpled indium-tin-oxide electrodes for transparency tuning
Author(s): Hui-Yng Ong; Milan Shrestha; Gih Keong Lau
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Paper Abstract

Optical transparency of an indium-tin-oxide (ITO) thin film depends on its topography. Wrinkling of ITO thin film can reduce normal transmittance or visibility by scattering the incident light away. In this paper, we study topography change of ITO thin film and its effect on normal transmittance of light. Coating of ITO thin film on adhesive poly-acrylate elastomer forms wrinkles and folds when subjected to mechanical compression and surface buckling. At excessive compression, such as 25% equi-biaxial, folds of the ITO thin film are so deep and convoluted like crumpling of a piece of paper. This crumpled form of ITO thin film can well obscure the light passing even though a flat ITO thin film is transparent. Surprisingly, the crumpled ITO thin film remains continuous and conductive even with 25% equi-biaxial compression despite the fact that ITO is known to be brittle. These crumpled ITO thin films were subsequently used to make compliant electrodes for Dielectric elastomer actuator (DEA). These crumpled ITO thin film can be reversibly unfolded through the DEA’s areal expansion. This DEA with 14.2% equi-biaxially crumpled ITO thin films can produce 37% areal expansion and demonstrate an optical transmittance change from 39.14% to 52.08% at 550nm wavelength.

Paper Details

Date Published: 15 April 2016
PDF: 6 pages
Proc. SPIE 9798, Electroactive Polymer Actuators and Devices (EAPAD) 2016, 97981Z (15 April 2016); doi: 10.1117/12.2219566
Show Author Affiliations
Hui-Yng Ong, Nanyang Technological Univ. (Singapore)
Nanyang Polytechnic (Singapore)
Milan Shrestha, Nanyang Technological Univ. (Singapore)
Gih Keong Lau, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 9798:
Electroactive Polymer Actuators and Devices (EAPAD) 2016
Yoseph Bar-Cohen; Frédéric Vidal, Editor(s)

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