Buckling in serpentine microstructures and applications in elastomer-supported ultra-stretchable electronics with high areal coverage

Yihui Zhang, Sheng Xu, Haoran Fu, Juhwan Lee, Jessica Su, Keh Chih Hwang, John A. Rogers*, Yonggang Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

140 Scopus citations

Abstract

Lithographically defined electrical interconnects with thin, filamentary serpentine layouts have been widely explored for use in stretchable electronics supported by elastomeric substrates. We present a systematic and thorough study of buckling physics in such stretchable serpentine microstructures, and a strategic design of the serpentine layout for an ultra-stretchable electrode, via analytical models, finite element method (FEM) computations, and quantitative experiments. Both the onset of buckling and the postbuckling behaviors are examined, to determine scaling laws for the critical buckling strain and the limits of elastic behavior. Two buckling modes, namely the symmetric and anti-symmetric modes, are identified and analyzed, with experimental images and numerical results that show remarkable levels of agreement for the associated postbuckling processes. Based on these studies and an optimization of the design layout, we demonstrate routes for application of serpentine interconnects in an ultra-stretchable electrode that offer, simultaneously, an areal coverage as high as 81% and a biaxial stretchability as large as ∼170%.

Original languageEnglish (US)
Pages (from-to)8062-8070
Number of pages9
JournalSoft Matter
Volume9
Issue number33
DOIs
StatePublished - Jan 1 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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