【摘 要】
：
Vanadium dioxide (VO2) has emerged as a promising micro-actuator material for its large amplitude and high work density across the transition between the insulating (M1 and M2) and metallic (R) phase.Even though M2-R transition offers about 70％ higher tra
【机 构】
：
Center for Advancing Materials Performance from the Nanoscale,State Key Laboratory for Mechanical Be
论文部分内容阅读
Vanadium dioxide (VO2) has emerged as a promising micro-actuator material for its large amplitude and high work density across the transition between the insulating (M1 and M2) and metallic (R) phase.Even though M2-R transition offers about 70％ higher transformation stress than M1-R structural phase transition,the application of the M2 phase in the micro-actuators is hindered by the fact that previously,M2 phase can only stay stable under tensile stress.In this work,we propose and verify that by synthesizing the VO2 nanowires under optimized oxygen-rich conditions,stoichiometry change can be introduced into the nanowires (NWs) which in turn yield a large number free-standing single-crystalline M2-phase NWs stable at room temperature.In addition,we demonstrate that the output stress of the M2-phase NWs is about 65％ higher than that of the M1-phase NWs during their transition to R phase,quite close to the theoretical prediction.Our findings open new avenues towards enhancing the performance of VO2-based actuators by using M2-R transition.
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