Synthesis of tungsten-doped vanadium dioxide using a modified polyol method involving 1-dodecanolopen access
- Authors
- Lee, Yonghyun; Jung, Sang Won; Park, Sang Hwi; Yoo, Jung Whan; Park, Juhyun
- Issue Date
- Dec-2020
- Publisher
- MDPI AG
- Keywords
- Nanoparticles; Smart windows; Thermochromic; Tungsten doping; Vanadium oxide
- Citation
- Materials, v.13, no.23, pp 1 - 13
- Pages
- 13
- Journal Title
- Materials
- Volume
- 13
- Number
- 23
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/43753
- DOI
- 10.3390/ma13235384
- ISSN
- 1996-1944
1996-1944
- Abstract
- The doping of tungsten into VO2 (M) via a polyol process that is based on oligomerization of ammonium metavanadate and ethylene glycol (EG) to synthesize a vanadyl ethylene glycolate (VEG) followed by postcalcination was carried out by simply adding 1-dodecanol and the tungsten source tungstenoxytetrachloride (WOCl4 ). Tungsten-doped VEGs (W-VEGs) and their calcinated compounds (Wx VO2 ) were prepared with varying mixing ratios of EG to 1-dodecanol and WOCl4 concentrations. Characterizations of W-VEGs by powder X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and infrared and transmittance spectroscopy showed that tungsten elements were successfully doped into Wx VO2, thereby decreasing the metal-insulator transition temperature from 68 down to 51◦ C. Our results suggested that WOCl4 variously combined with 1-dodecanol might interrupt the linear growth of W-VEGs, but that such an interruption might be alleviated at the optimal 1:1 mixing ratio of EG to 1-dodecanol, resulting in the successful W doping. The difference in the solar modulations of a W0.0207 VO2 dispersion measured at 20 and 70◦ C was increased to 21.8% while that of a pure VO2 dispersion was 2.5%. It was suggested that WOCl4 coupled with both EG and 1-dodecanol at an optimal mixing ratio could improve the formation of W-VEG and Wx VO2 and that the bulky dodecyl chains might act as defects to decrease crystallinity. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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