Capillary self-alignment of microchips on soft substrates

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Uppsala University
  • Huazhong University of Science and Technology

Abstract

Soft micro devices and stretchable electronics have attracted great interest for their potential applications in sensory skins and wearable bio-integrated devices. One of the most important steps in building printed circuits is the alignment of assembled micro objects. Previously, the capillary self-alignment of microchips driven by surface tension effects has been shown to be able to achieve high-throughput and high-precision in the integration of micro parts on rigid hydrophilic/superhydrophobic patterned surfaces. In this paper, the self-alignment of microchips on a patterned soft and stretchable substrate, which consists of hydrophilic pads surrounded by a superhydrophobic polydimethylsiloxane (PDMS) background, is demonstrated for the first time. A simple process has been developed for making superhydrophobic soft surface by replicating nanostructures of black silicon onto a PDMS surface. Different kinds of PDMS have been investigated, and the parameters for fabricating superhydrophobic PDMS have been optimized. A self-alignment strategy has been proposed that can result in reliable self-alignment on a soft PDMS substrate. Our results show that capillary self-alignment has great potential for building soft printed circuits.

Details

Original languageEnglish
Article number41
Pages (from-to)1-9
JournalMICROMACHINES
Volume7
Issue number3
Publication statusPublished - 1 Mar 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Capillary self-alignment, Hydrophilic/superhydrophobic patterned surfaces, Soft micro devices, Stretchable electronics, Superhydrophobic PDMS

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