Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers

Laurens T. de Haan, Timo J.J. Willigers, Levina E.A. Wijkhuijs, Matthew Hendrikx, Cuong Thai Nguyen, Philippe Leclère, Anne E.J. Souren, Guofu Zhou, Michael G. Debije

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
48 Downloads (Pure)

Abstract

Wrinkling is a powerful technique for the preparation of surface structures over large areas, but it is difficult to simultaneously control the direction, period, and amplitude of the wrinkles without resorting to complicated procedures. In this work, we demonstrate a wrinkling system consisting of a liquid crystal polymer network and a thin layer of gold, in which the direction of the wrinkles is controlled by the alignment of the liquid crystal molecules and the average amplitude and period are controlled by a high-intensity UV irradiation. The UV exposure represses the amplitude and period dictated by the total exposure. Using photoalignment and photomasks, we demonstrate an unprecedented control over the wrinkling parameters and were able to generate some striking optical patterns. The mechanism of the wrinkle suppression was investigated and appears to involve localized photodegradation at the polymer-gold interface, possibly due to the formation of mechanoradicals.

Original languageEnglish
Pages (from-to)10543-10549
Number of pages7
JournalLangmuir
Volume34
Issue number36
DOIs
Publication statusPublished - 8 Aug 2018

    Fingerprint

Cite this