Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 31, Pages 28387-28396Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06363
Keywords
laser processed; nature-inspired; kirigami; electrophysiological; serpentine
Funding
- National Research Foundation of Korea [2018R1D1A1B07048232, 2014M3A9D7070732, 2017R1A2B4009963]
- Ministry of Trade, Industry, and Energy (MOTIE)
- Korea Evaluation Industrial Technology (KEIT) through Industrial Strategic Technology Development Program [10080348]
- Gyeonggi-do Regional Research Center program of Gyeonggi province (GRRC) [Sungkyunkwan 2017-B06]
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Physiological monitoring through skin patch stretchable devices has received extensive attention because of their significant findings in many human-machine interaction applications. In this paper, we present novel nature-inspired, kiri-spider, serpentine structural designs to sustain mechanical deformations under complex stress environments. Strain-free mechanical structures involving stable high areal coverage (spiderweb), three-dimensional out-of-plane deformations (kirigami), and two-dimensional (2D) stretchable (2D spring) electrodes demonstrated high levels of mechanical loading under various strains, which were verified through theoretical and experimental studies. Alternative to conventional microfabrication procedures, sensors fabricated by a facile and rapid benchtop programmable laser machine enabled the realization of low-cost, high-throughput manufacture, followed by transferring procedures with a nearly 100% yield. For the first time, we demonstrated laser-processed thin (similar to 10 mu m) flexible filamentary patterns embedded within the solution-processed polyimide to make it compatible with current flexible printed circuit board electronics. A patch-based sensor with thin, breathable, and sticky nature exhibited remarkable water permeability >20 g h(-1) m(-2) at a thickness of 250 mu m. Moreover, the reusability of the sensor patch demonstrated the significance of our patch-based electrophysiological sensor. Furthermore, this wearable sensor was successfully implemented to control human-machine interfaces to operate home electronic appliances and monitor mental stress in a pilot study. These advances in novel mechanical architectures with good sensing performances provide new opportunities in wearable smart sensors.
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