Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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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
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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.

본 연구에서는 낮은 열전이 온도를 가지는 텅스텐이 도핑된 이산화바나듐$(W-VO_2)$을 제조하였다. 텅스텐이 도핑된 이산화바나듐은 바나딜설페이트$(VOSO_4)$와 중탄산암모늄($(NH_4)$ $HCO_3$)을 전구체로 열분해 과정을 통해 제조하였다. 이에 대한 입자의 구조 및 열전이 특성을 FE-SEM, EDS, XRD, XPS, DSC 분석을 통해 조사하였다. 그 결과 텅스텐이 도핑된 이산화바나듐 입자의 형상은 판상형태로 텅스텐이 이산화바나듐 결정에 잘 도핑 되어 있음을 확인 하였다. 텅스텐이 도핑된 이산화바나듐의 결정 구조는 단사정으로 60 nm의 크기를 가지고 있었으며, 화학적인 조성 및 표면 상태는 이산화바나듐과 유사하였다. 또한, 텅스텐이 도핑된 이산화바나듐의 상전이 온도는 $38.5^{\circ}C$로 순수한 이산화바나듐의 상전이 온도인 $67.7^{\circ}C$에 비해 $29.2^{\circ}C$ 낮게 나타났으며, 가역 상전이 안정성이 우수하였다.

Keywords

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