Preparation and Phase Transition Temperature Control of VO<sub>2</sub> Nano-particles by Micro-emulsion Method from Molecular-designed Precursors

DOI Web Site 16 References
  • SUZUKI Hisao
    Shizuoka University, Research Institute of Electronics
  • KAWAGUCHI Takahiko
    Shizuoka University, Graduate School of Integrated science and Technology
  • SAKAMOTO Naonori
    Shizuoka University, Research Institute of Electronics
  • WAKIYA Naoki
    Shizuoka University, Research Institute of Electronics
  • ARAI Takashi
    Numazu college, Department of Chemistry and Biochemistry
  • HIRAI Shigeto
    Kitami Institute of Technology, School of Earth, Energy and Environmental Engineering
  • OHNO Tomoya
    Kitami Institute of Technology, School of Earth, Energy and Environmental Engineering

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Other Title
  • 分子設計された前駆体からのマイクロエマルション法による二酸化バナジウムナノ粒子の合成と相転移温度制御

Abstract

<p>Vanadium dioxide, VO2, undergoes the phase transition from monoclinic to tetragonal with property change from semiconductor to metal, respectively, at about 68°C. Metallic tetragonal structure reflects infrared light, and semiconducting monoclinic structure transmits it, leading to the thermochromic smart window. On the other hand, the phase transition temperature is slightly higher than the room temperature and can be lowered by tungsten or the other metal cation doping. Furthermore, VO2 nanoparticles with lower transition temperature and particle size less than 100 nm is essential for the smart window because the light scattering can be dramatically suppressed by reducing the particle size to obtain a high transparency. In this study, we tried to control the particle size and the phase transition temperature of VO2 nanoparticles by the microemulsion method from the molecular-designed precursors. The resultant VO2 particles were characterized by XRD, DSC, SEM. Primary particle size of the resulting VO2 nano-particles was estimated to be 37 nm with average aggregation size of about 200 nm. The phase transition temperature for the W doped VO2 was 24°C. As a result, we successfully synthesized the VO2 nanoparticles for smart window with controlled particle size and phase transition temperature by microemulsion method.</p>

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