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

ABSTRACT: Monoclinic M-phase VO₂ is a promising candidate for thermochromic materials due to its abrupt change in the near infrared (NIR) transmittance along with the metal-to-insulator transition (MIT) at a critical temperature ∼68 °C. However, low luminous transmittance (T _lum), poor solar energy modulation ability (ΔT _sol), and high phase transition temperature (T _c) can limit the application of VO₂ for smart windows. To overcome these limitations, 3D mesoporous structure can be employed in VO₂ films. Herein, 3D mesoporous structures assembled from monoclinic M-phase VO₂ nanoflakes with a pore size of about 2-10 nm were synthesized by a hydrothermal method using Ensete ventricosum fiber (EF) as a template followed by calcination at 450 °C. The prepared film exhibited excellent thermochromic performance with balanced T _lum = 67.3%, ΔT _sol = 12.5%, and lowering T _c to 63.15 °C. This is because the 3D mesoporous structure can offer the uniform dispersion of VO₂ nanoflakes in the film to enhance T _lum, ensure sufficient VO₂ nanoflakes in the film for high ΔT _sol and lower T _c. Therefore, this work can provide a green approach to synthesize 3D mesoporous structures assembled from monoclinic M-phase VO₂ nanoflakes and promote their application in smart windows.

SUBMITTER: Molloro LH

PROVIDER: S-EPMC8697583 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature

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

Molloro Liboro Hundito LH Tain Shouqin S Belachew Neway N Owusu Kwadwo Asare KA Zhao Xiujian X

RSC advances 20210413 22

Monoclinic M-phase VO2 is a promising candidate for thermochromic materials due to its abrupt change in the near infrared (NIR) transmittance along with the metal-to-insulator transition (MIT) at a critical temperature ∼68 °C. However, low luminous transmittance (T lum), poor solar energy modulation ability (ΔT sol), and high phase transition temperature (T c) can limit the application of VO2 for smart windows. To overco ...[more]

PMID: 35423886

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Project description:Fenestration elements that enable spectrally selective dynamic modulation of the near-infrared region of the electromagnetic spectrum are of great interest as a means of decreasing the energy consumption of buildings by adjusting solar heat gain in response to external temperature. The binary vanadium oxide VO2 exhibits a near-room-temperature insulator-metal electronic transition accompanied by a dramatic modulation of the near-infrared transmittance. The low-temperature insulating phase is infrared transparent but blocks infrared transmission upon metallization. There is considerable interest in harnessing the thermochromic modulation afforded by VO2 in nanocomposite thin films. However, to prepare a viable thermochromic film, the visible-light transmittance must be maintained as high as possible while maximizing thermochromic modulation in the near-infrared region of the electromagnetic spectrum, which necessitates the development of high-crystalline-quality VO2 nanocrystals of the optimal particle size embedded within the appropriate host matrix and refractive index matched to the host medium. Here, we demonstrate the preparation of acrylate-based nanocomposite thin films with varying sizes of embedded VO2 nanoparticles. The observed strong size dependence of visible-light transmittance and near-infrared modulation is explicable on the basis of optical simulations. In this article, we elucidate multiple scattering and absorption mechanisms, including Mie scattering, temperature-/phase-variant refractive-index mismatch between VO2 nanocrystals and the encapsulating matrix, and the appearance of a surface plasmon resonance using temperature-variant absorptance and diffuse transmittance spectroscopy measurements performed as a function of particle loading for the different sizes of VO2 nanocrystals. Nanocrystals with dimensions of 44 ± 30 nm show up to >32% near-infrared energy modulation across the near-infrared region of the electromagnetic spectrum while maintaining high visible-light transmission. The results presented here, providing mechanistic elucidation of the size dependence of the different scattering mechanisms, underscore the importance of nanocrystallite dimensions, refractive-index matching, and individualized dispersion of particles within the host matrix for the preparation of viable thermochromic thin films mitigating Mie scattering and differential refractive-index scattering.

Dataset Information

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

Publications

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

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