Crumpled indium-tin-oxide electrodes for transparency tuning

Hui Yng Ong, Milan Shrestha, Gih Keong Lau

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationElectroactive Polymer Actuators and Devices (EAPAD) 2016
EditorsFrederic Vidal, Yoseph Bar-Cohen
PublisherSPIE
ISBN (Electronic)9781510600393
DOIs
StatePublished - 1 Jan 2016
EventElectroactive Polymer Actuators and Devices (EAPAD) 2016 - Las Vegas, United States
Duration: 21 Mar 201624 Mar 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9798
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceElectroactive Polymer Actuators and Devices (EAPAD) 2016
CountryUnited States
CityLas Vegas
Period21/03/1624/03/16

Keywords

  • Crumpled electrode
  • Dielectric elastomer actuator (DEA)
  • Indium-tin-oxide (ITO)
  • Surface wrinkles
  • Transmittance tuning

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  • Cite this

    Ong, H. Y., Shrestha, M., & Lau, G. K. (2016). Crumpled indium-tin-oxide electrodes for transparency tuning. In F. Vidal, & Y. Bar-Cohen (Eds.), Electroactive Polymer Actuators and Devices (EAPAD) 2016 [97981Z] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9798). SPIE. https://doi.org/10.1117/12.2219566