Journal
ADVANCED MATERIALS
Volume 30, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801852
Keywords
conductive ink; epidermal electronics; hydrographic transfer; printed electronics; stretchable electronics
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Funding
- Foundation of Science and Technology of Portugal through the CMU-Portugal [CMUP-ERI/TIC/0021/2014]
- PAMI [CENTRO-01-0145-FEDER-022158, PEst-C/EME/UI0285/2013]
- Air Force Office of Sponsored Research (AFOSR) Multi-University Research Initiative [40202.1.1042254, MURI- 40202.1.1042254]
- Foundation of Science and Technology of Portugal through the CMU-Portugal project Stretchtronics [CMUP-ERI/TIC/0021/2014]
- Fundação para a Ciência e a Tecnologia [CMUP-ERI/TIC/0021/2014] Funding Source: FCT
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Coating inkjet-printed traces of silver nanoparticle (AgNP) ink with a thin layer of eutectic gallium indium (EGaIn) increases the electrical conductivity by six-orders of magnitude and significantly improves tolerance to tensile strain. This enhancement is achieved through a room-temperature sintering process in which the liquid-phase EGaIn alloy binds the AgNP particles (approximate to 100 nm diameter) to form a continuous conductive trace. Ultrathin and hydrographically transferrable electronics are produced by printing traces with a composition of AgNP-Ga-In on a 5 mu m-thick temporary tattoo paper. The printed circuit is flexible enough to remain functional when deformed and can support strains above 80% with modest electromechanical coupling (gauge factor approximate to 1). These mechanically robust thin-film circuits are well suited for transfer to highly curved and nondevelopable 3D surfaces as well as skin and other soft deformable substrates. In contrast to other stretchable tattoo-like electronics, the low-cost processing steps introduced here eliminate the need for cleanroom fabrication and instead requires only a commercial desktop printer. Most significantly, it enables functionalities like electronic tattoos and 3D hydrographic transfer that have not been previously reported with EGaIn or EGaIn-based biphasic electronics.
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