Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 40, Pages 45504-45515Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11479
Keywords
body area sensor network; flexible printed circuit boards; directly printed on-body sensors; room-temperature sintering; sintering aid layer
Funding
- Pennsylvania State University
- National Science Foundation (NSF) [59021-DNI7]
- American Chemical Society Petroleum Research Fund [ECCS-1933072]
- Shenzhen Science and Technology Program [KQTD20170809110344233, JCYJ20170811160129498]
- Bureau of Industry and Information Technology of Shenzhen through the Graphene Manufacturing Innovation Center [201901161514]
- Natural Science Foundation of China [11672090]
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A soft body area sensor network presents a promising direction in wearable devices to integrate on-body sensors for physiological signal monitoring and flexible printed circuit boards (FPCBs) for signal conditioning/readout and wireless transmission. However, its realization currently relies on various sophisticated fabrication approaches such as lithography or direct printing on a carrier substrate before attaching to the body. Here, we report a universal fabrication scheme to enable printing and room-temperature sintering of the metal nanoparticle on paper/fabric for FPCBs and directly on the human skin for on-body sensors with a novel sintering aid layer. Consisting of polyvinyl alcohol (PVA) paste and nanoadditives in the water, the sintering aid layer reduces the sintering temperature. Together with the significantly decreased surface roughness, it allows for the integration of a submicron-thick conductive pattern with enhanced electromechanical performance. Various on-body sensors integrated with an FPCB to detect health conditions illustrate a system-level example.
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