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권순근(Soongeun Kwon),최학종(Hak-Jong Choi),안준형(Junhyoung Ahn),임형준(Hyungjun Lim),김기홍(Geehong Kim),최기봉(Kee-Bong Choi),이재종(JaeJong Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We have demonstrated graphene-based textile microsupercapacitors (MSCs) by using thermal transfer printing. In thermal transfer printing, an adhesive film of a heat transfer paper was employed as a flat, buffer adhesive layer on a rough textile substrate. Laser-induced graphene (LIG) directly laser-written on polyimide (PI) films was transferred onto the adhesive film area of the textile substrates at elevated temperature and pressure. A thermally transfer-printed LIG pattern preserved porous structure with 3D interconnected pores and high electrical conductivity of LIG formed on PI films. The developed textile LIG-MSCs exhibit electrical double layer capacitive characteristics with areal capacitance of 0.76mFcm-2 and excellent capacitance retention of 96% after 1000 cycles of large bending (180˚) deformation. Furthermore, LIG-MSCs with a LIG-metal composite exhibit fast ion transport at a high scan rates of up to 20Vs-1, suggesting outstanding rate capability among graphene-based textile MSCs.
생물학적 초미세력 검출을 위한 탄소나노튜브 프로브의 제작 및 기계적 특성 검출
권순근(Soongeun Kwon),박효준(Hyojun Park),이형우(Hyung Woo Lee),곽윤근(Yoonkeun Kwak),김수현(Soohyun Kim) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.5
In this study, a carbon nanotube probe (CNT probe) is proposed as a mechanical force transducer for the measurement of pico-Newton (pN) order force in biological applications. In order to measure nantube's displacement in the air or liquid environment ,the fabrication of a CNT probe with tip-specific loading of fluorescent dyes is performed using tip-specific functionalization of the nanotube and chemical bonding between dyes and nanotube. Also, we experimentally investigated the mechanical properties of the CNT probe using electrostatic actuation and fluorescence microscope measurement. Using fluorescence measurement of the tip deflection according to the applied voltage, we optimized the bending stiffness of the CNT probe, therefore determined the spring constant of the CNT probe. The results show that the spring constant of CNT probes is as small as 1 pN/㎚ and CNT probes can be used to measure pN order force.