Towards Unlocking/Tuning the Mott Transition Temperature in Alkaline-Doped Vanadium Oxide Thermochromic Coatings and Potential Green Air-Conditioning via Room Temperature VxOy-V-VxOy Layered Coatings
DOI:
https://doi.org/10.25159/3005-2602/13618Keywords:
vanadium oxides, Thermochromism, Solar heat management, Smart windows, Infrared modulation, Room temperature, phase transitionAbstract
In this contribution, we validate for the first time that the near infrared-infrared (NIR-IR) modulation of the optical transmission (DTTRANS = T(T<TMIT) - T(T>TMIT)) of vanadium oxide-based nanomaterials can be controlled or tuned via a genuine approach with a simultaneous drastic reduction of its Mott transition temperature TMIT. More accurately, we report a significant thermochromism in multilayered V2O5/V/V2O5 stacks equivalent to that of pure VO2 thin films but with a far lower transition temperature TMIT. Such a multilayered V2O5/V/V2O5 thermochromic system exhibited a net control or tunability of the optical transmission modulation in the NIR-IR (DTTRANS) via the nano-scaled thickness of the intermediate vanadium layer. In addition, the control of DTTRANS is accompanied by a noteworthy diminution of the Mott transition temperature TMIT from the bulk value of 68.8 °C to the range of 27.5–37.5 °C. The observed peculiar thermochromism in the multilayered V2O5/V/V2O5 is likely to be ascribed to a significant interfacial diffusion or an excessive interfacial stress/strain, and/or to an effective halide (Na, K, Ca) doping. This doping is driven by a significant diffusion from the borosilicate substrate surface towards the V2O5/V/V2O5 stacks. If the upscaling of this approach is validated, the current findings would contribute to advancing thermochromic nanomaterials and their applications in smart windows for managing solar heat and green air-conditioning technologies.
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Copyright (c) 2023 Sfundo Khanyile, Nagla Numan, Aline Simo, Mlungisi Nkosi, Christopher Bongani Mtshali, Zakhelumuzi Khumalo, Itani Given Madiba, Boitumelo Mabakachaba, H. Swart , E. Coetsee , M. Duvenhage , E. Lee , M. Henini , A. Gibaud , J. Kennedy , M. Chaker , Malek Maaza
This work is licensed under a Creative Commons Attribution 4.0 International License.
Accepted 2023-09-01
Published 2023-11-02
