3D mesoporous structure assembled from monoclinic M-phase VO<sub>2</sub> nanoflakes with enhanced thermochromic performance

Molloro, Liboro Hundito; Tain, Shouqin; Belachew, Neway; Owusu, Kwadwo Asare; Zhao, Xiujian

doi:10.1039/d1ra01558c

Cited by 3 publications

(2 citation statements)

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“…It means that although S4 has smaller Δ Tr sol , it can be beneficial for smart window applications in hot regions. The comparison of Tr lum and Δ Tr sol of single layer, ,− nanoporous, ,− nanoparticle, ,− and nanocomposite − films with this work is given in Figure S 4 in the Supporting Information. The Δ Tr sol of S2 is better than that of nanoparticles and even comparable with those of doped nanoporous and nanocomposite films, but the Tr lum of the prepared films is poor.…”

Section: Resultsmentioning

confidence: 99%

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Azmat,

Naseem,

Hajra

et al. 2024

ACS Appl. Energy Mater.

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VO 2 -based thin films are robust thermochromic materials in the pursuit of energy-efficient smart windows, but high metal−insulator transition temperature (T MIT ), low luminous transmittance (Tr lum ), and unsatisfactory solar modulation (ΔTr sol ) are primary hurdles. In this work, Sm-doped VO 2 thin films were reported for the first time deposited on a c-cut sapphire substrate using the hydrothermal method. Sm 3+ doping increases Tr lum , but it deteriorates ΔTr sol of VO 2 thin films. Compared with pure VO 2 , the 2 at % Sm doping level gives a good balance of thermochromic performance by increasing Tr lum from 23.5 to 28.2% over a little compromise in ΔTr sol from 8.9 to 7.3%. Moreover, due to the narrowing of E g1 on Sm doping, Tr sol of the M phase VO 2 consistently decreases to 22.1% at 6 at % Sm, which may be beneficial for smart window applications in hot regions where cooling is more demanding in summer than heating in winter. This study provides insight into VO 2 doping engineering via experimental and DFT studies, which may lead to prospects for advancing VO 2 nanofilms' thermochromic characteristics.

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Section: Resultsmentioning

confidence: 99%

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Azmat,

Naseem,

Hajra

et al. 2024

ACS Appl. Energy Mater.

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“…The calculated interplanar spacing was B0.32 nm, which matched well with the lattice spacing of the (011) plane. 29,30 In order to investigate the structural phase change from VOOH to VO 2 , different annealing temperatures and vacuum degrees were also employed. Fig.…”

Section: Transformation From Vooh To Vo 2 (M)mentioning

confidence: 99%

Kirkendall effect induced ultrafine VOOH nanoparticles and their transformation into VO₂(M) for energy-efficient smart windows

Wu,

Teng,

et al. 2024

Mater. Horiz.

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Low-Temperature Deposition of VO<sub>2</sub> Thin Films on Glass Substrates by MOD Method

WADA,

FUKAWA,

HIROSHIBA

et al. 2024

J. Soc. Mat. Sci., Japan

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The metal-organic decomposition (MOD) method is a promising method for the deposition of VO2 thin films, which are expected to be used as material for smart window. However, a serious problem for such applications is that the minimum baking temperature in the previous study is 580°C under nitrogen (N2) atmosphere, which exceeds the softening point of soda glass of ~500°C. In this study, we successfully reduced the baking temperature to 450°C for forming polycrystalline VO2 thin films on glass substrates in N2 atmosphere added with 4% H2. When the transmittance of VO2 thin films between the visible and near-infrared regions around the phase transition temperature was measured with a spectrophotometer, maximum values of the average transmittance at 90℃ between 400 and 800 nm was 54.4% and the maximum dimming rate for transmittance change at 1600 nm was 36.8%. Furthermore, the substitutional doping of Nb ions effectively lowered the phase transition temperature from 68℃ to 49℃ at the baking temperature of 450°C.

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3D mesoporous structure assembled from monoclinic M-phase VO₂ nanoflakes with enhanced thermochromic performance

Abstract: Herein, 3D mesoporous structures assembled from monoclinic M-phase VO2 nanoflakes were successfully synthesized for enhanced thermochromic performance.

Cited by 3 publications

References 58 publications

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Kirkendall effect induced ultrafine VOOH nanoparticles and their transformation into VO₂(M) for energy-efficient smart windows

Low-Temperature Deposition of VO<sub>2</sub> Thin Films on Glass Substrates by MOD Method

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3D mesoporous structure assembled from monoclinic M-phase VO2 nanoflakes with enhanced thermochromic performance

Abstract: Herein, 3D mesoporous structures assembled from monoclinic M-phase VO2 nanoflakes were successfully synthesized for enhanced thermochromic performance.

Cited by 3 publications

References 58 publications

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Kirkendall effect induced ultrafine VOOH nanoparticles and their transformation into VO2(M) for energy-efficient smart windows

Low-Temperature Deposition of VO<sub>2</sub> Thin Films on Glass Substrates by MOD Method

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Product

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3D mesoporous structure assembled from monoclinic M-phase VO₂ nanoflakes with enhanced thermochromic performance

Kirkendall effect induced ultrafine VOOH nanoparticles and their transformation into VO₂(M) for energy-efficient smart windows