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PET (polyethylene terephthalate) 박막 위의 마이크로 모세관 현상을 이용한 다중벽 탄소나노튜브 패턴 형성 및 변위 측정에 관한 연구
이탁건(Tahk-guhn Lee),박정열(Jungyul Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Multi-walled carbon nanotubes (MWCNT) were patterned on polyethylene terephthalate (PET) film using capillarity-driven fluidic force through polydimethylsiloxane (PDMS) microchannel mold. The micropatterned MWCNTs with highly ordered direction were applied as a flexible strain-gauge sensor, which is realized with simple fabrication process. It shows a novel sensitivity, compared to the previous carbon nanotube (CNT) based strain-gauge sensor, because of its highly ordered pattern.
Analysis and control of adhesion for efficient transfer printing
박정열(Jungyul Park),김민석(Min Sock Kim),이탁건(Tahk Guhn Lee),최범규(Bumkyoo Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The adhesion-based transfer printing process allows the devices to be fabricated through low temperature process, which is important for realizing flexible electronics with high mobility. Therefore, comprehensive understanding about adhesion between the solid object and the surface of elastomeric stamp (generally, polydimethylsiloxane (PDMS) is used) and the optimal strategy to control adhesion can support the effective and high yield transfer. In this paper, a novel adhesive force measurement system is developed to measure dynamic adhesive forces from the surface on the flexible stamp. The thermodynamic work of adhesion at the moment of debonding of a tip of sensor from the flexible stamp is modeled and used for developing the adhesion control strategy. The measurement results show that the work of adhesion is strongly dependent on the peel-off velocity of tip, while the indentation force has only minor effects on it. The effect of Young’s modulus of elastomeric stamp is also investigated using the model of work of adhesion based on the relation between the adhesive force and peel-off velocity. The elastomeric stamp with low Young’s modulus is preferred for efficient transfer printing.