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몰리브덴이 첨가된 이산화바나듐으로 표면처리한 탄소계 전도성판의 전기저항특성
최원규(Wongyu Choi),정혜미(Hye-Mi Jung),이종현(Jonghyun Lee),임세준(Sejoon Im),엄석기(Sukkee Um) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Vanadium pentoxide (V₂O?) powder was prepared and mixed with Molybdenum Oxides (MoO3) to form Mo-doped and -undoped VO₂ films by a sol-gel method on graphite conductive substrates. X-Ray diffraction (XRD) and scanning electron microscopy (SEM) was used to investigate the chemical compositions and microstructures of the Mo-doped and -undoped VO₂ films. The variation of electrical resistance was measured as a function of temperature and stoichiometric composition between vanadium and molybdenum. In this study, it was found that Mo-doped and -undoped VO₂ shows the typical negative temperature coefficient (NTC) behavior. As the amount of the molybdenum increases, the electrical resistance of Modoped VO₂ film gets reduced under the transition temperature and a linear decrease in the transition temperature is observed. From these experimental results, we can conclude that the electrical resistance behavior with temperature change of VO₂ films can be utilized as a self-heating source with the electrical current flowing through the graphite substrate.