Synthesis of Tungsten Doped Vanadium Dioxide and Its Thermochromic Property Studies

텅스텐이 도핑된 바나듐 산화물의 합성 및 열전이 특성 연구

  • Hwang, Kyung-Jun (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Jo, Cho Won (Department of Chemical and Biological Engineering, Korea University) ;
  • Yoo, Jung Whan (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology)
  • 황경준 (한국세라믹기술원 에코복합소재센터) ;
  • 조초원 (고려대학교 화공생명공학과) ;
  • 유중환 (한국세라믹기술원 에코복합소재센터)
  • Published : 2013.02.10

Abstract

In this work, we have prepared tungsten doped vanadium oxide ($W-VO_2$) particles with a low phase transition temperature. $W-VO_2$ particles were synthesized via thermolysis method using vanadyl (IV) sulfate and ammonium bicarbonate as precursors. The structure and thermochromic property of synthesized $W-VO_2$ particles were investigated by FE-SEM, EDS, XRD, XPS, and DSC analysis. The prepared $W-VO_2$ showed a nearly platy morphology, which indicates that the tungsten was successfully doped in the crystal lattices of $VO_2$. $W-VO_2$ nanoparticles with the size of 60 nm exhibited a monoclinic crystal structure and its chemical composition and surface state were also likely to be close to that of $VO_2$. In addition, the phase transition temperature of $W-VO_2$ was $38.5^{\circ}C$, which was approximately $29.2^{\circ}C$ lower than that of pure $VO_2$ ($67.7^{\circ}C$), indicating that the prepared sample had a good reversible thermochromic stability.

Keywords

thermochoromic;vanadium dioxide;tungsten;phase transition

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