Self-rolling of vanadium dioxide nanomembranes for enhanced multi-level solar modulation

Xing Li, Cuicui Cao, Chang Liu, Wenhao He, Kaibo Wu, Yang Wang, Borui Xu, Ziao Tian, Enming Song, Jizhai Cui, Gaoshan Huang, Changlin Zheng, Zengfeng Di, Xun Cao () and Yongfeng Mei ()
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Xing Li: Fudan University
Cuicui Cao: Chinese Academy of Sciences
Chang Liu: Fudan University
Wenhao He: Fudan University
Kaibo Wu: Fudan University
Yang Wang: Fudan University
Borui Xu: Fudan University
Ziao Tian: Chinese Academy of Sciences
Enming Song: Fudan University
Jizhai Cui: Fudan University
Gaoshan Huang: Fudan University
Changlin Zheng: Fudan University
Zengfeng Di: Chinese Academy of Sciences
Xun Cao: Chinese Academy of Sciences
Yongfeng Mei: Fudan University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Thermochromic window develops as a competitive solution for carbon emissions due to comprehensive advantages of its passivity and effective utilization of energy. How to further enhance the solar modulation ( $${\triangle T}_{{{{{{{\rm{sol}}}}}}}}$$ △ T sol ) of thermochromic windows while ensuring high luminous transmittance ( $${T}_{{{{{{{\rm{lum}}}}}}}}$$ T lum ) becomes the latest challenge to touch the limit of energy efficiency. Here, we show a smart window combining mechanochromism with thermochromism by self-rolling of vanadium dioxide (VO2) nanomembranes to enhance multi-level solar modulation. The mechanochromism is introduced by the temperature-controlled regulation of curvature of rolled-up smart window, which benefits from effective strain adjustment in VO2 nanomembranes upon the phase transition. Under geometry design and optimization, the rolled-up smart window with high $${\triangle T}_{{{{\rm{sol}}}}}$$ △ T sol and $${T}_{{{{{{\rm{lum}}}}}}}$$ T lum is achieved for the modulation of indoor temperature self-adapted to seasons and climate. Furthermore, such rolled-up smart window enables high infrared reflectance after triggered phase transition and acts as a smart lens protective cover for strong radiation. This work supports the feasibility of self-rolling technology in smart windows and lens protection, which promises broad interest and practical applications of self-adapting devices and systems for smart building, intelligent sensors and actuators with the perspective of energy efficiency.

Date: 2022
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DOI: 10.1038/s41467-022-35513-w

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