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A bioinspired, synthetic multicellular ionic polymer composite for ultrasensitive ionic skin
( Amoli Vipin ),김주성,김소영,구제형,최한빈,정윤선,김윤아,김도환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Ionic skin is a new type of sensory sheet, composed of an elastic matrix swollen by ionic liquids, that can detect the external stimuli similar to human skin. Here, we present a bioinspired synthetic multicellular ionic polymer composite composed of ionic liquid confined on the surface of silica microparticles (as artificial cells) embedded into a thermoplastic polyurethane elastomeric matrix (artificial extracellular matrix) to fabricate ultrasensitive ionic skins (48.1-5.8 kPa<sup>-1</sup>) over a wide spectrum of pressures (0-135 kPa) at an ultra-low voltage of 1 mV. This ionic skin engages in hydrogen bond-triggered reversible pumping of ionic fluids under pressure with the ability to surpass the pressuresensing capabilities of natural skin mechanoreceptors. Our ultrasensitive ionic skin realizes the fabrication of a wearable drone microcontroller, capable of simultaneous and selective controlling of aerial drone’s during its flight.
An electrochromically-driven photonic skin based on highly deformable iontronic polymer pump
구제형,( Amoli Vipin ),김소영,김도환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Photonic skin is a sensory device system that can directly reflect external stimuli by generating visual human-readable response through optical means such as light emitting or chromism. Electrochromism is the phenomenon that color of semiconducting materials is reversibly changed by electrochemical redox reaction. In this work, we report the first electrochemically-driven photonic skin based on highly deformable iontronic polymer pump. Ionic thermoplastic polyurethane film with ionic liquid ([EMIM<sup>+</sup>][TFSI<sup>-</sup>]) prepared under an optimal condition, as a role of functional elastomeric ion pumps, could serve good mechanical properties, high transmittance, and ionic conductivity. In addition, we could selectively migrate ions into the chromic material with a conductive pen under low voltage. This allows us to expect that our iontronic, photonic skin can be applicable to active touch board for directly visualized writing and erasing, reversibly for next generation human-machine soft interface.
Jang, Sukjin,Jee, Eunsong,Choi, Daehwan,Kim, Wook,Kim, Joo Sung,Amoli, Vipin,Sung, Taehoon,Choi, Dukhyun,Kim, Do Hwan,Kwon, Jang-Yeon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.37
<P>The development of a highly sensitive artificial mechanotransducer that mimics the tactile sensing features of human skin has been a big challenge in electronic skin research. Here, we demonstrate an ultrasensitive, low-power oxide transistor-based mechanotransducer modulated by microstructured, deformable ionic dielectrics, which is consistently sensitive to a wide range of pressures from 1 to 50 kPa. To this end, we designed a viscoporoelastic and ionic thermoplastic polyurethane (i-TPU) with micropyramidal feature as a pressure-sensitive gate dielectric for the indium-gallium-zinc-oxide (IGZO) transistor-based mechanotransducer, which leads to an unprecedented sensitivity of 43.6 kPa<SUP>-1</SUP>, which is 23 times higher than that of a capacitive mechanotransducer. This is because the pressure-induced ion accumulation at the interface of the i-TPU dielectric and IGZO semiconductor effectively modulates the conducting channel, which contributed to the enhanced current level under pressure. We believe that the ionic transistor-type mechanotransducer suggested by us will be an effective way to perceive external tactile stimuli over a wide pressure range even under low power (<4 V), which might be one of the candidates to directly emulate the tactile sensing capability of human skin.</P> [FIG OMISSION]</BR>