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02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Large-Area Synthesis of Hexagonal Boron Nitride and Graphene for Novel Energy Harvesters
2014년 2월 27일 09시 28분 44초
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목 14시 : 50분
Two-Dimensional Materials: Graphene, Transition Metal Dichalcogenides, and Others II
성균관대학교 신소재공학부, Korea
Hexagonal boron nitride (h-BN) has received a great deal of attention as a substrate material for high-performance graphene electronics, because it has an atomically smooth surface, lattice constant similar to that of graphene, large optical phonon modes, and a large electrical band gap. I will present the large-scale synthesis of high-quality h-BN nanosheets in a chemical vapor deposition (CVD) process by controlling the surface morphologies of the copper (Cu) catalysts. It was found that morphology control of the Cu foil is much critical for the formation of the pure h-BN nanosheets as well as the improvement of their crystallinity. We demonstrate the performance enhancement of CVD-based graphene devices with large-scale h-BN nanosheets. The mobility of the graphene device on the h-BN nanosheets was increased three times compared to that without the h-BN nanosheets. The on-off ratio of the drain current is two times higher than that of the graphene device without h-BN. This work suggests that high-quality h-BN nanosheets based on CVD are very promising for high-performance large-area graphene electronics.
As a second issue, I will address graphene-based novel energy harvesters. The rapid development of graphene has increased the demand for next generation electronics. The application of graphene as an exciting transparent and flexible mechanical energy scavenging device is an effective approach for sustainable and green power source for wireless, portable and implanted electronics. We experimentally demonstrate the first application of CVD grown graphene as an energy-generating active material for transparent flexible triboelectric nanogenerator (NG) and its high electric output power generation under vertical compressive strain. NGs based on mono, double, triple, quadruple and few layers of graphene (grown on Cu-foil and Ni-foil via CVD approach) have been fabricated and their output voltage and current were measured under mechanical strains. Monolayer based graphene NG exhibits high power compared to other randomly staked graphene layer based NG, while output voltage and current from conventional staked few layers based NG (grown on Ni-foil via CVD approach) reached up to maximum value of 9.0 V and 1.2 ㎂/cm
, with conversion efficiency up to 8.7 %. This study provides a facile new avenue for harvesting mechanical energy from transparent flexible graphene based NG for self-powered systems.
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