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Facile synthesis, formation mechanism and thermochromic properties of W-doped VO2(M) nanoparticles for smart window applications

Zhang, L., Xia, F.ORCID: 0000-0002-4950-3640, Yao, J., Zhu, T., Xia, H., Yang, G., Liu, B. and Gao, Y. (2020) Facile synthesis, formation mechanism and thermochromic properties of W-doped VO2(M) nanoparticles for smart window applications. Journal of Materials Chemistry C, 8 (38). pp. 13396-13404.

Link to Published Version: https://doi.org/10.1039/d0tc03436c
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Abstract

Monoclinic VO2(M) has been considered as one of the most promising materials for fabricating energy-saving smart windows, but its scalable synthesis is still a great challenge. In this work, pure and tungsten (W)-doped VO2(M) nanoparticles (20–50 nm) were prepared by a simple hydrothermal recrystallization method using an amorphous precursor obtained from coprecipitation in a mixed VOSO4 and NaOH solution (pH = 9). The phase transition temperature of the obtained W-doped VO2(M) nanoparticles decreases with increasing W-doping, by −28.4 °C per at% of W in the range of 0–1.1 at%. The mechanism of hydrothermal recrystallization was studied by using ex situ powder X-ray diffraction (PXRD) and in situ synchrotron radiation-based PXRD. It was found that the hydrothermal synthesis underwent two steps: (1) recrystallization of amorphous precursor to VO2(B) crystals, and (2) allotropic phase transformation from the metastable intermediate VO2(B) to VO2(M). In addition, the fabricated films using VO2(M) with 0.7 at% W-doping showed excellent thermochromic performance, with a suitable phase transition temperature of 42.7 °C, high average luminance transmittance of up to 61.7%, and good solar energy modulation ability of 11.7%, making them a suitable material for efficient and low-cost energy saving smart windows.

Item Type: Journal Article
Murdoch Affiliation: Chemistry and Physics
Publisher: Royal Society of Chemistry
Copyright: © 2020 The Royal Society of Chemistry
URI: http://researchrepository.murdoch.edu.au/id/eprint/58430
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