Fabrication and Deformation of 3D Multilayered Kirigami Microstructures

Mohammad Humood, Yan Shi, Mengdi Han, Joseph Lefebvre, Zheng Yan, Matt Pharr, Yihui Zhang, Yonggang Huang, John A. Rogers, Andreas A. Polycarpou*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Mechanically guided 3D microassembly with controlled compressive buckling represents a promising emerging route to 3D mesostructures in a broad range of advanced materials, including single-crystalline silicon (Si), of direct relevance to microelectronic devices. During practical applications, the assembled 3D mesostructures and microdevices usually undergo external mechanical loading such as out-of-plane compression, which can induce damage in or failure of the structures/devices. Here, the mechanical responses of a few mechanically assembled 3D kirigami mesostructures under flat-punch compression are studied through combined experiment and finite element analyses. These 3D kirigami mesostructures consisting of a bilayer of Si and SU-8 epoxy are formed through integration of patterned 2D precursors with a prestretched elastomeric substrate at predefined bonding sites to allow controlled buckling that transforms them into desired 3D configurations. In situ scanning electron microscopy measurement enables detailed studies of the mechanical behavior of these structures. Analysis of the load–displacement curves allows the measurement of the effective stiffness and elastic recovery of various 3D structures. The compression experiments indicate distinct regimes in the compressive force/displacement curves and reveals different geometry-dependent deformation for the structures. Complementary computational modeling supports the experimental findings and further explains the geometry-dependent deformation.

Original languageEnglish (US)
Article number1703852
JournalSmall
Volume14
Issue number11
DOIs
StatePublished - Mar 15 2018

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Keywords

  • 3D mesostructures
  • damage tolerance
  • in situ compression
  • kirigami
  • recovery

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Cite this

Humood, M., Shi, Y., Han, M., Lefebvre, J., Yan, Z., Pharr, M., Zhang, Y., Huang, Y., Rogers, J. A., & Polycarpou, A. A. (2018). Fabrication and Deformation of 3D Multilayered Kirigami Microstructures. Small, 14(11), [1703852]. https://doi.org/10.1002/smll.201703852