Experimental and theoretical studies of serpentine microstructures bonded to prestrained elastomers for stretchable electronics

Yihui Zhang, Shuodao Wang, Xuetong Li, Jonathan A. Fan, Sheng Xu, Young Min Song, Ki Joong Choi, Woon Hong Yeo, Woosik Lee, Sharaf Nafees Nazaar, Bingwei Lu, Lan Yin, Keh Chih Hwang, John A. Rogers*, Yonggang Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

135 Scopus citations

Abstract

Stretchable electronic devices that exploit inorganic materials are attractive due to their combination of high performance with mechanical deformability, particularly for applications in biomedical devices that require intimate integration with human body. Several mechanics and materials schemes have been devised for this type of technology, many of which exploit deformable interconnects. When such interconnects are fully bonded to the substrate and/or encapsulated in a solid material, useful but modest levels of deformation (<30-40%) are possible, with reversible and repeatable mechanics. Here, the use of prestrain in the substrate is introduced, together with interconnects in narrow, serpentine shapes, to yield significantly enhanced (more than two times) stretchability, to more than 100%. Fracture and cyclic fatigue testing on structures formed with and without prestrain quantitatively demonstrate the possible enhancements. Finite element analyses (FEA) illustrates the effects of various material and geometric parameters. A drastic decrease in the elastic stretchability is observed with increasing metal thickness, due to changes in the buckling mode, that is, from local wrinkling at small thicknesses to absence of such wrinkling at large thicknesses, as revealed by experiment. An analytic model quantitatively predicts the wavelength of this wrinkling, and explains the thickness dependence of the buckling behaviors.

Original languageEnglish (US)
Pages (from-to)2028-2037
Number of pages10
JournalAdvanced Functional Materials
Volume24
Issue number14
DOIs
StatePublished - Apr 9 2014

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Keywords

  • buckling analyses
  • flexible electronics
  • modeling
  • serpentine interconnect
  • stretchable electronics

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Zhang, Y., Wang, S., Li, X., Fan, J. A., Xu, S., Song, Y. M., Choi, K. J., Yeo, W. H., Lee, W., Nazaar, S. N., Lu, B., Yin, L., Hwang, K. C., Rogers, J. A., & Huang, Y. (2014). Experimental and theoretical studies of serpentine microstructures bonded to prestrained elastomers for stretchable electronics. Advanced Functional Materials, 24(14), 2028-2037. https://doi.org/10.1002/adfm.201302957