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Laser-Processed Nature-Inspired Deformable Structures for Breathable and Reusable Electrophysiological Sensors toward Controllable Home Electronic Appliances and Psychophysiological Stress Monitoring
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posted on 2019-07-25, 13:05 authored by Hyeokju Chae, Hyuk-Jun Kwon, Yu-Kang Kim, YooChan Won, Donghan Kim, Hi-Joon Park, Sunkook Kim, Srinivas GandlaPhysiological
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 (∼10 μm) 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 μm. 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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skin patch stretchable devicesstress environmentsfilamentary patternsnovel nature-inspiredpatch-based sensorlaser machineout-of-plane deformationssolution-processed polyimidepatch-based electrophysiological sensorcircuit board electronicswearable sensormicrofabrication proceduresareal coveragepilot studysensor patchPsychophysiological Stress Monitoring Physiological monitoringLaser-Processed Nature-Inspired Deformable StructuresControllable Home Electronic AppliancesReusable Electrophysiological Sensors250 μ m
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