อิทธิพลของสารเจือทังสเตนที่มีผลต่อสมบัติทางโครงสร้างและเทอร์โมโครมิกของวาเนเดียมไดออกไซด์ที่สังเคราะห์ด้วยวิธีไฮโดรเทอร์มอล

Krongtip Termkoa; Kittiya Plemjai; Woraphong Janetanakit; Krongkran Sirinukunwattana

doi:10.60136/bas.v8.2019.270

Authors

Krongtip Termkoa Department of Science Service
Kittiya Plemjai Department of Science Service
Woraphong Janetanakit Department of Science Service
Krongkran Sirinukunwattana Department of Science Service

DOI:

https://doi.org/10.60136/bas.v8.2019.270

Keywords:

Thermochromic smart glass, Vanadium dioxide, Transition temperature

Abstract

The research is to investigate effect of tungsten (W) dopant on thermal and structural properties of synthesized vanadium dioxide (VO₂). VO₂ was synthesized using vanadium pentoxide (V₂O₅) as a precursor and oxalic acid (H₂C₂O₄) as a reducing agent with 1:3 molar ratios by hydrothermal method at 260 °C. W with different weight ratios were added to the initial solution to reduce the phase transition temperature and a subsequent thermal annealing. The as-prepared VO₂ and W-doped VO₂ powder were characterized using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscope (SEM). DSC results showed that W doping can decrease phase transition temperature depending on concentration of W. The phase transition temperature was decreased to 35 °C when VO₂ was doped with the 5 wt. % W.

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