Abstract
Vanadium dioxide (VO2) nanowires endowed with a dramatic metal−insulator transition have attracted enormous attention. Here, the thermal conductance of VO2 nanowires with different sizes, measured using the thermal bridge method, is reported. A size-dependent thermal conductivity was observed where the thicker nanowire showed a higher thermal conductivity. Meanwhile, the thermal conductivity jump at metal−insulator transition temperature was measured to be much higher in the thicker samples. The dominant heat carriers were phonons both at the metallic and the insulating regimes in the measured samples, which may result from the coexistence of metal and insulator phases at high temperature. Our results provide a window into exploring the mechanism of the metal−insulator transition of VO2 nanowires.
Highlights
Thermal Conductivity of VO2Metal-insulator transition (MIT) has long been a widely researched centerpiece in condensed matter physics, with a number of efforts focusing on potentially exploiting the resulting changes in the functional properties in novel electronics and phononics, as well as understanding the emergent phenomena
The interest is mainly focused on the change of thermal conductivity in VO2 nanowires across the MIT along with the underlying mechanism
Oh et al measured the thermal properties of VO2 thin film with a thickness of 90–440 nm by time-domain thermoreflectance across the MIT temperature and found that the thermal conductivity increased by as much as 60% in the metallic phase [10]
Summary
Thermal Conductivity of VO2Metal-insulator transition (MIT) has long been a widely researched centerpiece in condensed matter physics, with a number of efforts focusing on potentially exploiting the resulting changes in the functional properties in novel electronics and phononics, as well as understanding the emergent phenomena. Oh et al measured the thermal properties of VO2 thin film with a thickness of 90–440 nm by time-domain thermoreflectance across the MIT temperature and found that the thermal conductivity increased by as much as 60% in the metallic phase [10].
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