| Study on the Growth of Monoclinic VO2 Phase Applicable for Thermochromic Ceramic Tile |
| DaeYong Jung, Ungsoo Kim, Wooseok Cho |
| Korea Institute of Ceramic Engineering and Technology |
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| ABSTRACT |
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Vanadium dioxide ($VO_2$) of monoclinic phase exhibits Metal Insulator Phase Transition (MIPT) phenomenon involving a sharp change in electrical and optical properties at $68^{circ}C$. Solution-based process is applied to form uniform $VO_2$ coating layer on ceramic tiles. This can selectively block the near-infrared light to possibly reduce the energy loss and prevent dew condensation caused by the temperature difference. Heat treatment conditions including temperature and dwell time were examined to obtain a monoclinic $VO_2$ single phase. Both rutile and monoclinic $VO_2$ phases were observed from in the tiles post-annealed below $700^{circ}C$. Desired monoclinic $VO_2$ single phase was grown in the tiles heat treated at $750^{circ}C$. Nano facets of irregular size were observed in the monoclinic $VO_2$ phase involving the phase-transition. Grain growth of monoclinic $VO_2$ phase was observed as a function of dwell time at $750^{circ}C$. |
| Key words:
Thermochromic, Vanadium oxide, MIPT, Infrared block, Ceramic tile |
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