Affiliation:
1. Shenzhen Key Laboratory of Sustainable Biomimetic Materials Guangdong Provincial Key Laboratory of Sustainable Biomimetic Materials and Green Energy Department of Materials Science and Engineering Institute of Innovative Materials Guangming Advanced Research Institute Southern University of Science and Technology Shenzhen 518055 China
2. New Cornerstone Science Laboratory Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale Department of Chemistry Institute of Biomimetic Materials & Chemistry Anhui Engineering Laboratory of Biomimetic Materials University of Science and Technology of China Hefei 230026 China
Abstract
AbstractMechanochromic light control technology that can dynamically regulate solar irradiation is recognized as one of the leading candidates for energy‐saving windows. However, the lack of spectrally selective modulation ability still hinders its application for different scenarios or individual needs. Here, inspired by the generation of structure color and color change of living organisms, a simple layer‐by‐layer assembly approach toward large‐area fabricating mechanically responsive film for visible and near‐infrared multiwavelength spectral modulation smart windows is reported here. The assembled SiO2 nanoparticles and W18O49 nanowires enable the film with an optical modulation rate of up to 42.4% at the wavelength of 550 nm and 18.4% for the near‐infrared region, separately, and the typical composite film under 50% stretching shows ≈41.6% modulation rate at the wavelength of 550 nm with NIR modulation rate less than 2.7%. More importantly, the introduction of the multilayer assembly structure not only optimizes the film's optical modulation but also enables the film with high stability during 100 000 stretching cycles. A cooling effect of 21.3 and 6.9 °C for the blackbody and air inside a model house in the real environmental application is achieved. This approach provides theoretical and technical support for the new mechanochromic energy‐saving windows.
Funder
National Natural Science Foundation of China
Shenzhen Science and Technology Innovation Program