Plasmonic thermochromic films are promising for smart window applications. Hereby, we develop a flexible plasmonic thermochromic film towards multifunctionality. The double-layer film consists of a bottom layer of W/Mg co-doped vanadium dioxide (VO2) rods in a polyurethane acrylate matrix and a top layer of hollow silica spheres (HSSs). Based on the finite-difference time-domain (FDTD) method, we demonstrate for the first time, a transverse and a longitudinal mode of VO2 localized surface plasmonic resonance (LSPR) in near- and mid-infrared bands, respectively, and only the transverse mode contributes to the solar energy modulation performance. The film shows a luminous transmittance of 46.2%, a solar energy modulation of 10.8%, and a critical transition temperature of 36.9 °C. The HSSs overcoating enhances the surface hydrophilicity and thermal insulation, which give rise to more favored functionalities for windows.
Bibliographical noteFunding Information:
Q. Xu, Y. Ke, and C. Feng contribute equally. X. Liu acknowledges the support of the National Natural Science Foundation of China (Grant No. 51776143 and U1830127 ) and Fundamental Research Funds for the Central Universities (Grant No. 2042018kf0238 ). The usage of SEM, TEM, and XPS funded by the Open Subsidies for large-scale Equipment of Wuhan University (Grant No. LF20181061). Y. Long thanks to the funding support by the National Research Foundation , Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme, Sino-Singapore International Joint Research Institute, and Minister of Education Singapore Tier 1 RG86/20 and RG103/19 for funding support.
© 2021 Elsevier B.V.
- Smart window
- Solar modulation
- Surface plasmon resonance
- Thermal management