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Flexible hybrid nanomaterials for multifunctional electronic skins
고현협 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Flexible electronic skins with high tactile sensitivities provide great opportunities in applications of wearable electronics, robotics, and biomedical devices. Here, we introduce highly-sensitive, multifunctional, and flexible electronic skins based on interlocked geometry of microdome-patterned hybrid elastomers. The interlocked microdome arrays provide a giant tunneling piezoresistance due to the enhanced change in inter-microdome contact area in response to various mechanical stimuli, leading to a high pressure sensitivity and rapid response/relaxation times. In addition, we show that electronic skins can detect minute environmental changes in real-time and simultaneously resolve multidirectional forces. Finally, we demonstrate wearable electronic skins for the sensitive monitoring of human breathing flows and voice vibrations, which should find applications in human-health monitoring systems.
Bio-Inspired Micro/Nanostructures for Wearable Sensors
고현협 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Mimicking the structures and functions of fingertip skin, we introduce highly-sensitive, multifunctional, and stretchable electronic skins (e-skins). We demonstrate stress-direction-sensitive e-skins based on piezoresistive interlocked microdomes, which possess direction-sensitive detection capability of various mechanical stimuli including normal, shear, stretching, bending, and twisting forces. We also demonstrate that ferroelectric skins with fingerprint-like patterns can detect and discriminate multiple spatio-temporal tactile stimuli including static and dynamic pressure, vibration, and temperature with high sensitivities. Finally, we demonstrate a flexible ferroelectric sensor with an ultrahigh pressure sensitivity and linear response over an broad pressure range based on the multilayer interlocked microdome geometry.