Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Thermochromic Property of Tungsten Doped VO2 Prepared by Hydrothermal Method

수열합성법으로 제조된 텅스텐이 도핑된 VO2의 열변색 특성

  • An, Ba Ryong (Department of Industrial & Applied Chemistry, Pukyong National University) ;
  • Lee, Gun-Dae (Department of Industrial & Applied Chemistry, Pukyong National University) ;
  • Son, Dae Hee (R&D Center, CFC Teramate Co.) ;
  • Lee, Seung Ho (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Park, Seong Soo (Department of Industrial & Applied Chemistry, Pukyong National University)
  • Received : 2013.06.19
  • Accepted : 2013.09.10
  • Published : 2013.12.10
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Abstract

Vanadium oxide ($VO_2$) and tungsten-doped vanadium oxide (W-$VO_2$) powder, well known as thermochromic materials, were prepared from vanadium pentoxide ($V_2O_5$) and oxalic acid dihydrate by hydrothermal and calcination process. The crystal structure and thermochromic property of samples were analyzed using FE-SEM, XRD, XPS, DSC, and UV-Vis-NIR spectroscopy. With increasing the doping amount of W, the phase transition temperature of W-$VO_2$ sample decreased from $70^{\circ}C$ to $42^{\circ}C$. When heating W-$VO_2$ sample above the phase transition temperature, the UV-Vis-NIR spectrum was not changed in the visible range and shifted towards a low transparency in the full name (NIR) region.

본 연구에서는 바나듐 산화물($VO_2$)과 텅스텐이 도핑된 바나듐 산화물(W-$VO_2$) 분말을 바나듐 산화물($V_2O_5$)과 옥살산수화물로부터 수열합성과 하소공정을 통하여 성공적으로 제조하였다. 시료들의 결정구조와 열변색 특성들은 FE-SEM, XRD, XPS, DSC 및 UV-Vis-NIR 분광기를 이용하여 분석하였다. W-$VO_2$ 시료에 W의 도핑량을 증가시키면, W-$VO_2$ 시료의 상전이 온도가 $70^{\circ}C$에서 $42^{\circ}C$로 낮아지는 경향이 있었다. 또한, W-$VO_2$ 시료를 상전이 온도 이상으로 가열시키면 UV-Vis-NIR 곡선이 가시광 영역에서는 변하지 않고 NIR 영역에서는 낮은 투과도 방향으로 이동하는 경향이 있었다.

Keywords

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