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Xiao Liang1 Huai Yang1

1, Peking University, Beijing, , China

Smart windows, with abilities of achieving energy-saving and optimizing solar energy utilization, are playing a key role in reducing the overall energy spending and increasing comfort levels for people inside the building. However, the optical modulation of smart windows is usually constricted within a limited waveband, either visible (400-800 nm) or near infrared (NIR, 800-2500 nm) region, and also they must use additional energy to maintain the colored or transparent state. Herein we report a flexible multi-responsive smart film with a widest waveband modulation covering both visible and NIR region (400-2500 nm) reported to date, by creating the compatible interface between tin doped indium oxide (ITO) nanocrystals and polar syrup containing liquid crystals with a smectic A (SmA)/chiral nematic (N*) phase transition and photo-polymerizable monomers. The transmittance of as-made smart film can be thermally changed reversibly from highly transparent (78%) to strong light-scattering (1.5%) state in the visible region, and the light-scattering state of the film also can be regulated electrically. Moreover, more than 85% of the invisible NIR light can be efficiently shielded, resulted from a well-preserved localized surface Plasmon resonance from ITO NCs. The present work represents a key step forward towards preparing optical materials with multi-functional features for applications in energy-saving smart windows.

1. Liang X, Guo S, Chen M, et al. A temperature and electric field-responsive flexible smart film with full broadband optical modulation[J]. Materials Horizons, 2017, 4(5): 878-884. (IF:10.706)
2. Liang X, Guo C, Chen M, et al. A roll-to-roll process for multi-responsive soft-matter composite films containing CsxWO3 nanorods for energy-efficient smart window applications[J]. Nanoscale Horizons, 2017, 2(6): 319-325. (IF:pending)
3. Liang X, Chen M, Guo S, et al. Dual-Band Modulation of Visible and Near-Infrared Light Transmittance in an All-Solution-Processed Hybrid Micro-Nano Composite Film[J]. ACS Applied Materials &Iinterfaces, 2017. (IF:7.506)

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