Capillary Self-Alignment of Microchips on Soft Substrates
2016 (English)In: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 7, no 3, 41Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2016. Vol. 7, no 3, 41
Manufacturing, Surface and Joining Technology
IdentifiersURN: urn:nbn:se:uu:diva-279824DOI: 10.3390/mi7030041ISI: 000373053100012OAI: oai:DiVA.org:uu-279824DiVA: diva2:909006