• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.95-96
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• 2012

• ETRI Journal
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• 제40권2호
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• pp.275-282
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• 2018

Flash reduction of graphene oxide is an efficient method for producing high quality reduced graphene oxide under room temperature ambient conditions without the use of hazardous reducing agents (such as hydrazine and hydrogen iodide). The entire process is fast, low-cost, and suitable for large-scale fabrication, which makes it an attractive process for industrial manufacturing. Herein, we present a simple fabrication method for a flexible in-plane graphene micro-supercapacitor using flash light irradiation. All carbon-based, monolithic supercapacitors with in-plane geometry can be fabricated with simple flash irradiation, which occurs in only a few milliseconds. The thinness of the fabricated device makes it highly flexible and thus useful for a variety of applications, including portable and wearable electronics. The rapid flash reduction process creates a porous graphene structure with high surface area and good electrical conductivity, which ultimately results in high specific capacitance ($36.90mF\;cm^{-2}$) and good cyclic stability up to 8,000 cycles.

• 수산해양기술연구
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• 제31권4호
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• pp.379-384
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• 1995

위협광에 의한 어류의 행동제어개발을 위하여, 스트로보광에 대한 전갱이와 잉어의 명순응과정을 조사하였는데, 스트로브광의 섬광빈도는 전갱이의 경우, 1.7, 5, 10, 25, 430Hz의 5단계, 잉어의 경우는 1.7, 5, 25Hz의 3단계로 하였다. 안구표본의 채취는 조사전과 조사직후부터 1, 5, 10, 30분 경과마다 행하였고, 채취한 각 표본은 종단조직절편을 만들고 현미경 관찰을 행하였다. 망막의 순응율은 원추체지수를 구하여 나타내었다. 조사시간에 따른 평균 순응율은; \circled1 전갱이의 경우, 광조사전의 27%가 1, 5, 10, 30분 경과 시마다 각각 42.6%, 49.8%, 59.8%, 83.1%로 증가하였다. \circled2 잉어의 경우, 광조사전의 28.4%가 1, 5, 30분 경과 시마다 각각 51%, 54.9%, 91.3%로 되었다. 명순응과정은; \circled1 전갱이의 경우 430Hz, 25Hz, 5Hz, 1.7Hz, 10Hz의 순으로, \circled2 잉어의 경우는 25Hz, 5Hz, 1.7Hz의 순으로 대략 빨랐다.

• 한국전기전자재료학회논문지
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• 제37권4호
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• pp.427-432
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• 2024

The polymer crystallization process, promoting the formation of ferroelectric β-phase, is essential for developing polyvinylidene fluoride (PVDF)-based high-performance piezoelectric energy harvesters. However, traditional high-temperature annealing is unsuitable for the manufacture of flexible piezoelectric devices due to the thermal damage to plastic components that occurs during the long processing times. In this study, we investigated the feasibility of introducing a flash lamp annealing that can rapidly induce the β-phase in the PVDF layer while avoiding device damage through selective heating. The flash light-irradiated PVDF films achieved a maximum β-phase content of 76.52% under an applied voltage of 300 V and an on-time of 1.5 ms, a higher fraction than that obtained through thermal annealing. The PVDF-based piezoelectric energy harvester with the optimized irradiation condition generates a stable output voltage of 0.23 V and a current of 102 nA under repeated bendings. These results demonstrate that flash lamp annealing can be an effective process for realizing the mass production of PVDF-based flexible electronics.