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습식 산화법으로 성장된 산화구리입자를 이용한 방열 컴파운드 제조 및 특성 연구
이동우,엄창현,주제욱,Lee, Dong Woo,Um, Chang Hyun,Chu, Jae Uk 한국재료학회 2017 한국재료학회지 Vol.27 No.4
Various morphologies of copper oxide (CuO) have been considered to be of both fundamental and practical importance in the field of electronic materials. In this study, using Cu ($0.1{\mu}m$ and $7{\mu}m$) particles, flake-type CuO particles were grown via a wet oxidation method for 5min and 60min at $75^{\circ}C$. Using the prepared CuO, AlN, and silicone base as reagents, thermal interface material (TIM) compounds were synthesized using a high speed paste mixer. The properties of the thermal compounds prepared using the CuO particles were observed by thermal conductivity and breakdown voltage measurement. Most importantly, the volume of thermal compounds created using CuO particles grown from $0.1{\mu}m$ Cu particles increased by 192.5 % and 125 % depending on the growth time. The composition of CuO was confirmed by X-ray diffraction (XRD) analysis; cross sections of the grown CuO particles were observed using focused ion beam (FIB), field emission scanning electron microscopy (FE-SEM), and energy dispersive analysis by X-ray (EDAX). In addition, the thermal compound dispersion of the Cu and Al elements were observed by X-ray elemental mapping.
전기방사에 의한 섬유상 질화알루미늄 합성 및 특성 평가
전승엽,황진아,주제욱,전명표 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.7
Aluminum nitride fibers were synthesized by carbothermal reduction and nitridation of precursor fibers obtained by electrospinning. The starting materials used to synthesize the AlN fibers were Al(NO3)3・9H2O and urea. Polyvinylpyrrolidone with increasing viscidity was used as the carbon source to obtain a composite solution. The mixed solution was drawn into a plastic syringe with a stainless steel needle, which was used as the spinneret and connected to a 20 kV power supply. A high voltage was supplied to the solution to facilitate the formation of a dense net of fibers on the collector. The precursor fibers were dried at 100℃ and then heated to 1,400℃ for 1 h in a microwave furnace under N2 gas flow for the carbothermal reduction and nitridation. X-ray diffraction studies indicated that the synthesized fibers consisted of the AlN phase. Field emission scanning electron microscopy studies indicated that the diameter of the calcined fibers was approximately 100 nm. 질화알루미늄 (AlN) 나노섬유를 전기방사를 이용하여 열탄소 환원질화법으로 합성하였다. 방사용액을 제조하기 위한 출발 물질로서 금속염인 Al(NO3)3 수화물, 질화알루미늄 합성반응에서의 연료로 Urea, 방사를 위한 고분자 화합물인 PVP(Polyvinylpyrrolidone, 1300K)를 탄소원으로 이용한다. 출발물질의 용매로는 DMF가 첨가된 ethanol를 주로 한다. 용매로 DMF와 ethanol 비를 1:3 질량비로 하여 점도도 600cP에서 가장 이상적인 전기방사가 가능함을 확인하였다. 전기방사 섬유상을 얻기 위해 전기방사 장치의 인가전압을 20KV 까지 하여 유량 10um/min 로 전기 방사된 섬유상을 얻었다. 이후, 마이크로웨이브 열처리 방식으로 1400도 1시간 N2 분위기 3L/min 조건으로 하여 최종 합성된 평균직경 100nm인 질화알루미늄 나노 섬유를 XRD와 FE-SEM으로 확인하였다.
전기방사에 의한 질화붕소 나노분말의 함량에 따른 질화붕소 나노섬유 합성 및 특성 평가
이종혁,전명표,황진아,정영근,주제욱,Lee, Jong Hyeok,Chun, Myoung Pyo,Hwang, Jin Ah,Jung, Young Geun,Chu, Jae Uk 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
Boron nitride (BN) nanofibers were fabricated using BN nanoparticles (70 nm) by electrospinning. Morphologies such as the diameter and density of the BN nanofibers are strongly influenced by the viscosity and dispersion state of the precursor solution. In this study, the precursor solution was prepared by ball milling BN nanoparticles and polyvinylpyrrolidone (PVP, Mw~1,300,000) in ethanol, which was electrospun and then calcined to produce BN fibers. High-quality BN nanofibers were well fabricated at a BN concentration of 15 wt% with their diameters in the range of 500 nm to 800 nm; the viscosity of the precursor solution was $400mPa{\cdot}S$. The calcination of the as-electrospun BN fibers seemed to be completed by holding them at $350^{\circ}C$ for 2 h considering the TGA data. The morphologies and phases of the BN fibers were investigated by scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively; Fourier transform infrared (FT-IR) was also used for structure analysis.