Designable Phase Transition Temperature of VO2 Co-Doped with Nb and W Elements for Smart Window Application

2019 ◽  
Vol 19 (11) ◽  
pp. 7185-7191
Author(s):  
Hee Jung Kim ◽  
Dong Kyu Roh ◽  
Jung Whan Yoo ◽  
Dae-Sung Kim
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Solar Modulation ◽  
Smart Window ◽  
Smart Windows ◽  
Co Doping ◽  
Window Applications ◽  
Nb Dopant ◽  
Co Doped

Monoclinic vanadium dioxide (VO2 (M)) particles co-doped with niobium and tungsten, with potential application in smart windows, were synthesized by hydrolysis and subsequent thermal decomposition of vanadyl sulfate. All the doped VO2 particles exhibited a monoclinic crystalline phase and the critical phase transition temperature (Tc) of VO2 (M) was adjusted by Nb and W co-doping. The Tc of Nb-doped VO2 (M) decreased at a rate of approximately 10 °C/at% Nb dopant, and the transition temperature could also be accurately controlled to room temperature (about 27 °C) by co-doping with Nb and W. A film prepared using co-doped VO2 (M) particles showed a solar modulation ability of ~18% and a luminous transmittance of 40%, indicating that the co-doped VO2 (M) particles represent suitable candidates for smart window applications.

High thermochromic performance of Fe/Mg co-doped VO2 thin films for smart window applications

2018 ◽  
Vol 6 (24) ◽  
pp. 6502-6509 ◽  
Author(s):  
Chunhui Ji ◽  
Zhiming Wu ◽  
Lulu Lu ◽  
Xuefei Wu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
New Method ◽  
Smart Window ◽  
Smart Windows ◽  
Practical Applications ◽  
Co Doping ◽  
Window Applications ◽  
Vo2 Thin Films ◽  
First Time ◽  
Co Doped

A new method, Fe/Mg co-doping, is proposed for the first time to optimize thermochromic VO2 and the promising performance of VO2-based smart windows for practical applications is successfully achieved.

Controllable synthesis of VO2(D) and their conversion to VO2(M) nanostructures with thermochromic phase transition properties

2016 ◽  
Vol 3 (8) ◽  
pp. 1035-1042 ◽  
Author(s):  
Zhengdong Song ◽  
Liangmiao Zhang ◽  
Fang Xia ◽  
Nathan A. S. Webster ◽  
Jingchao Song ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Thermal Hysteresis ◽  
Controllable Synthesis ◽  
Smart Windows ◽  
Hysteresis Width ◽  
Calcination Method

VO2(M) nanostructures with lower thermochromic phase transition temperature and narrower thermal hysteresis width were synthesized by a hydrothermal-calcination method, making them suitable candidates for smart windows.

scholarly journals One-step ball milling synthesis of VO2 (M) nanoparticles with exemplary thermochromic performance

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Chiyuan Wang ◽  
Huiyan Xu ◽  
Tongyao Liu ◽  
Shuaijun Yang ◽  
Yong Nie ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Ball Milling ◽  
Phase Transition Temperature ◽  
Large Scale ◽  
Molar Ratio ◽  
Ambient Conditions ◽  
Doping Amount ◽  
Smart Windows ◽  
Milling Method

AbstractVanadium dioxide (VO2) has demonstrated highly potential for smart windows because of its thermochromic property. This study represents the development of a facile but efficient method for the synthesis of VO2 (M) nanoparticles by ball milling method under ambient conditions, without release of waste liquid or gases. The key variables related to synthesis, including milling time and molar ratio of raw materials, have been investigated. It was found that the pure-phase VO2 (M) nanoparticles with the sizes of the particles ranged from 20 to 50 nm and relatively good dispersivity could be prepared by optimizing process parameters. For practice use to decrease the phase transition temperature, elemental W doping amount of 2 at.%, V1−xWxO2 (M) nanoparticles were also studied, and their glass coating exhibits high thermochromic performance with luminous transmittance (Tlum) of 44.18%, solar regulation efficiency (∆Tsol) of 9.64%, and the critical phase transition temperature (Tc) of ~ 42 °C. This work demonstrates a green and promising ball milling method to fabricate large scale VO2 (M) and V1−xWxO2 (M) nanoparticles for smart windows.

Boron doped M-phase VO2 nanoparticles with low metal-insulator phase transition temperature for smart windows

2020 ◽  
Vol 46 (4) ◽  
pp. 4786-4794 ◽  
Author(s):  
Qiaoting Zhou ◽  
Weizhong Lv ◽  
Qi Qiu ◽  
Tianzi Zhou ◽  
Chunbo Huang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Metal Insulator ◽  
Smart Windows ◽  
Boron Doped ◽  
M Phase ◽  
Insulator Phase Transition
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