# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Synthesis and Characterization of Vanadium Oxide Film by Sparking Method for Thermochromic Application

21 May 2015, 13:00
3h 30m
Board: MNA-03
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology

### Speaker

Mr Winai Thongpan (Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)

### Description

Vanadium dioxide (VO${}_2$) has a great potential to be utilized as thermochromic glazing for improving the energy efficiency of buildings. The famous semiconductor-to-metal phase transition (SMT) property of VO${}_2$ shows the reversible optical properties when the temperature is above the critical point at 68 ${}^{\circ}$C. In this work, VO${}_2$ films were prepared by sparking method on glass substrates and annealed for 2 – 6 hours at 300 – 500 ${}^{\circ}$C. Thickness of VO${}_2$ films was varied from 100 to 500 nm by increasing the sparking cycles. The surface morphology of samples was analyzed by atomic force microscopy and scanning electron microscopy. The solar reflectance and transmittance were investigated by UV-Vis-NIR spectroscopy. The results show that the roughness of the films was decreased by rising the annealing temperatures and the near-infrared transmittance trend of products were dropped down by controlling the working temperatures from 30 to 90 ${}^{\circ}$C.

### Primary author

Mr Winai Thongpan (Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)

### Co-author

Prof. Pisith Singjai (Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)

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