Tuning thermochromic performance of VOx-based multilayer films by controlling annealing pressure

Zhan, Yiqiang; Lü, Yuan; Xiao, Xiudi; Wang, Jixi; Liu, Yangbiao; Zhang, Shaohong; Shen, Cong; Xu, Xueqing; Xu, Gang

doi:10.1016/j.ceramint.2019.09.188

Cited by 11 publications

(10 citation statements)

References 46 publications

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“…The four samples are all M-phase VO 2 . We calculate the size of VO 2 nanocrystals using the formula ( ) . First, an additional XRD measurement was carried out using the LaB 6 standard sample to obtain the instrument width.…”

Section: Resultsmentioning

confidence: 77%

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Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Chang

Wang

Zhao

et al. 2021

ACS Appl. Nano Mater.

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Ultrafine M-phase VO2 nanocrystals with good crystallinity are desirable for highly efficient thermochromic flexible films. Herein, we report an oxygen-controlled hydrothermal method to achieve the one-step preparation of stoichiometric and size-controllable VO2(M) nanoparticles for scaled-up production. The specific ratio of oxygen intake to V ions was first determined to guarantee the acquisition of stoichiometric VO2(M). Then, the hydrothermal conditions were optimized to perform size-controllable growth of VO2(M) nanoparticles. VO2(M) nanoparticles with average particle sizes of 25, 32, 41, and 52 nm were prepared by changing the precursor solution concentration under the determined oxygen intake/V ion ratio. Smaller VO2(M) nanoparticles exhibit better thermochromic performance because a smaller size favors light transmission and promotes blue-shifting of the local surface plasmon resonance. The flexible film fabricated with 25 nm VO2(M) nanoparticles shows an excellent thermochromic performance with a solar modulation efficiency (ΔT sol) of 19.2% and a luminous transmittance (T lum) up to 66.42%. This work proposes a simple and effective hydrothermal process producing size-controllable VO2(M) nanoparticles with low cost and scalable production and demonstrates that the size reduction of VO2(M) nanoparticles is favorable for flexible films to exhibit excellent thermochromic properties.

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Section: Resultsmentioning

confidence: 77%

“…We calculate the size of VO 2 nanocrystals using the formula ( 30 First, an additional XRD measurement was carried out using the LaB 6 standard sample to obtain the instrument width. Then, the instrument width and the Kα2 diffraction were stripped off from the XRD patterns.…”

Section: Resultsmentioning

confidence: 99%

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Chang

Wang

Zhao

et al. 2021

ACS Appl. Nano Mater.

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“…Previous works have already confirmed the positive effect of some antireflection layers in enhancing the optical properties of VO 2 -based films, such as TiO 2 , 201,202 SiO 2 , 201 CeO 2 , 203 ZrO 2 , 204,205 ZnO, 206–208 SnO 2 , 206 WO 3 , 206 Cr 2 O 3 209 and SiN x . 210,211 Some scholars have also attempted to design the structure of the antireflection layers. For example, S. Liu et al 187 constructed a moth-eye-structured TiO 2 antireflection layer.…”

Section: Smart Applications Of Element-doped Vo2mentioning

confidence: 99%

Element doping: a marvelous strategy for pioneering the smart applications of VO₂

Xue

Yin

2022

Nanoscale

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“…If it reaches its T c (68 • C), a strong modulation of near-infrared transmittance takes place. VO 2 can be obtained by several methods: physical vapor deposition [37][38][39] has been the most studied method, though nanostructured VO 2 has also been studied recently [40]. On the contrary, the modulation of visible transmittance (T vis ) is quite moderate (less than 10%).…”

Section: Thermochromic Materialsmentioning

confidence: 99%

“…Doping strategies of VO 2 have led to much lower T c ≈ 25 • C [42]. Zhan et al [39] reported the TC performance of VO x -based multilayer films that are effectively controlled by annealing pressure: the T c was reduced to 54 • C by changing the annealing pressure, without doping. Xu et al reviewed a recent advance in TC composites for smart windows [52], with special reference to multilayer composite structures that improve the VO 2 properties.…”

Section: Thermochromic Materialsmentioning

confidence: 99%

Chromogenic Technologies for Energy Saving

Cannavale

2020

Clean Technol.

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Chromogenic materials and devices include a wide range of technologies that are capable of changing their spectral properties according to specific external stimuli. Several studies have shown that chromogenics can be conveniently used in building façades in order to reduce energy consumption, with other significant effects. First of all, chromogenics influence the annual energy balance of a building, achieving significant reductions in consumption for HVAC and artificial lighting. In addition, these technologies potentially improve the indoor level of visual comfort, reducing the risks of glare and excessive lighting. This brief review points to a systematic discussion—although not exhaustive and mainly limited to recent results and investigations—of the main studies that deal with building-integrated chromogenics that have appeared, so far, in the scientific literature.

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Tuning thermochromic performance of VOx-based multilayer films by controlling annealing pressure

Cited by 11 publications

References 46 publications

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Element doping: a marvelous strategy for pioneering the smart applications of VO₂

Chromogenic Technologies for Energy Saving

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Tuning thermochromic performance of VOx-based multilayer films by controlling annealing pressure

Cited by 11 publications

References 46 publications

Size-Controllable M-Phase VO2 Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Size-Controllable M-Phase VO2 Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Element doping: a marvelous strategy for pioneering the smart applications of VO2

Chromogenic Technologies for Energy Saving

Contact Info

Product

Resources

About

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Element doping: a marvelous strategy for pioneering the smart applications of VO₂