Tungsten doped M-phase VO2 mesoporous nanocrystals with enhanced comprehensive thermochromic properties for smart windows

Li, Bin; Tian, Shouqin; Tao, Haizheng; Zhao, Xiujian

doi:10.1016/j.ceramint.2018.11.109

Cited by 51 publications

(39 citation statements)

References 52 publications

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“…On the other hand, the thermochromic properties gained in our study are compared with those of W x VO 2 with the MIT temperature (T c ) in a range of 40-45 • C in Table 2. The T lum at 20 • C and ∆T sol of W 0.0207 VO 2 in this study are higher than those of reported materials except the T lum at 20 • C of the W-doped VO 2 /polyvinylpyrrolidone coating as presented in the Table 2 [32][33][34][35]. This comparison suggests that W x VO 2 materials in our study have a great potential for thermochromic applications.…”

Section: Scheme 2 Chemical Structures Of Species That Can Be Formed contrasting

confidence: 43%

Synthesis of Tungsten-Doped Vanadium Dioxide Using a Modified Polyol Method Involving 1-Dodecanol

Lee

Jung

Park³

et al. 2020

Materials

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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 (WxVO2) 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 WxVO2, 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 W0.0207VO2 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 WxVO2 and that the bulky dodecyl chains might act as defects to decrease crystallinity.

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Section: Scheme 2 Chemical Structures Of Species That Can Be Formed contrasting

confidence: 43%

Synthesis of Tungsten-Doped Vanadium Dioxide Using a Modified Polyol Method Involving 1-Dodecanol

Lee

Jung

Park³

et al. 2020

Materials

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“…In order to tackle the above issues, various methods have been employed such as establishing nano-composite film, multilayers and porous structures [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], doping [ 2 , 3 , 13 , 14 , 15 ] and optimization of preparation technology [ 10 , 11 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Kang et al [ 13 ] and Jiang et al [ 15 ] introduced Zn into VO 2 lattice, which can improve the T lum and Δ T sol of the film, and at the same time faded the yellow color of the film, however the unsatisfied optical properties were far from application requirement.…”

Section: Introductionmentioning

confidence: 99%

Acid Solution Processed VO2-Based Composite Films with Enhanced Thermochromic Properties for Smart Windows

Wang

Tian

et al. 2021

Materials

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As a typical thermochromic material, VO2 coatings can be applied to smart windows by modulating the transmission of near infrared (NIR) light via phase transition. However, the inherent undesirable luminous transmittance (Tlum) and solar modulation efficiency (ΔTsol) of pure VO2 impede its practical application. In order to solve this problem, the porous VO2 based composite film was prepared by magnetron sputtering and subsequent acid solution process with Zn2V2O7 particles used as a sacrificial template to create pores, which showed excellent Tlum (72.1%) and enhanced ΔTsol (10.7%) compared with pure VO2 film. It was demonstrated that the porous structure of the film caused by acid solution process could improve the Tlum obviously and the isolated VO2 nanoparticles presented strong localized surface plasmon resonance (LSPR) effects to enhance the ΔTsol. Therefore, this method will provide a facile way to prepare VO2 based films with excellent thermochromic performance and thus promote the application of the VO2 based films in smart windows.

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“…[ 4,7 ] As for the W‐doped VO 2 samples, the Δ T sol of 23.3% outperforms all the previous reported results as shown in Figure a, where the previously reported data were categorized depending on the doping elements. [ 40–50 ] Since it is always a trading‐off relationship between T lum and Δ T sol , compared with the other reported performance, our W‐doped VO 2 ‐polymer composite sample gives one of the most promising combinations of T lum = 40.8% and Δ T sol = 23.3%.…”

Section: Resultsmentioning

confidence: 82%

3D Printed Smart Windows for Adaptive Solar Modulations

Zhou

Tan

et al. 2020

Advanced Optical Materials

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Vanadium dioxide (VO2) based thermochromic smart window is considered as the most promising approach for economizing building energy consumption. However, the high phase transition temperature (τc), low luminous transmission (Tlum), and solar modulation (ΔTsol) impose an invertible challenge for commercialization. Currently, smart window research surprisingly assumes that the sunlight radiates in one direction which is obviously not valid as most regions receive solar radiation at various angles in different seasons. For the first time, solar elevation angle is considered and 3D printing technology is employed to fabricate tilted microstructures for modulating solar transmission dynamically. To maximize energy‐saving performance, the architecture of the structures (tilt, thickness, spacing, and width) and tungsten (W) doped VO2 can be custom‐designed according to the solar elevation angle variation at the midday between seasons and tackle the issue of compromised Tlum and ΔTsol with W‐doping. The energy consumption simulations in different cities prove the efficiency of such dynamic modulation. This first attempt to adaptively regulate the solar modulation by considering the solar elevation angle together with one of the best reported thermochromic properties (τc = 40 °C, Tlum(average) = 40.8%, ΔTsol = 23.3%) may open a new era of real‐world‐scenario smart window research.

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Tungsten doped M-phase VO2 mesoporous nanocrystals with enhanced comprehensive thermochromic properties for smart windows

Cited by 51 publications

References 52 publications

Synthesis of Tungsten-Doped Vanadium Dioxide Using a Modified Polyol Method Involving 1-Dodecanol

Synthesis of Tungsten-Doped Vanadium Dioxide Using a Modified Polyol Method Involving 1-Dodecanol

Acid Solution Processed VO2-Based Composite Films with Enhanced Thermochromic Properties for Smart Windows

3D Printed Smart Windows for Adaptive Solar Modulations

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