Liquid alloy printing of microfluidic stretchable electronics

Jeong, S. H. (author)

Hjort, K. (author)

Jobs, M. (author)

Sundqvist, J. (author)

Wu, Z. (author)

KTH Hållfasthetslära (Avd) (creator_code:org_t)

Royal Society of Chemistry (RSC), 2012
2012
English.
In: Lab on a Chip. - : Royal Society of Chemistry (RSC). - 1473-0197 .- 1473-0189. ; 12:22, s. 4657-4664

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Recently, microfluidic stretchable electronics has attracted great interest from academia since conductive liquids allow for larger cross-sections when stretched and hence low resistance at longer lengths. However, as a serial process it has suffered from low throughput, and a parallel processing technology is needed for more complex systems and production at low costs. In this work, we demonstrate such a technology to implement microfluidic electronics by stencil printing of a liquid alloy onto a semi-cured polydimethylsiloxane (PDMS) substrate, assembly of rigid active components, encapsulation by pouring uncured PDMS on-top and subsequent curing. The printing showed resolution of 200 μm and linear resistance increase of the liquid conductors when elongated up to 60%. No significant change of resistance was shown for a circuit with one LED after 1000 times of cycling between a 0% and an elongation of 60% every 2 s. A radio frequency identity (RFID) tag was demonstrated using the developed technology, showing that good performance could be maintained well into the radio frequency (RF) range.

By the author/editor: Jeong, S. H.; Hagman, Anton; Hjort, K.; Jobs, M.; Sundqvist, J.; Wu, Z.

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