Journal of Powder Materials

Research Article

Development of Highly Transparent and Thermo-Shielding Flexible Film via Colloidal ITO Nanocrystals: Hyoin Bae, Hyeyeon Jung, Juna Lee, Dahye Shin, Sungyeon Heo; J Powder Mater. 2024;31(6):508-512. Published online December 31, 2024; DOI: https://doi.org/10.4150/jpm.2024.00423

Abstract PDF: Infrared radiation accounts for approximately 50% of the solar spectrum. Specifically, the near-infrared (NIR) spectrum, ranging from 760 nm to 2500 nm, is primarily responsible for solar heat gain, increasing indoor temperatures and reducing heating and cooling efficiency. To address this issue, we developed a highly transparent thermo-shielding flexible film that maintains a high transmittance of the visible region (T = 80%) while reducing the transmittance of the NIR region (T ≈ 0%). NIR-absorbing indium tin oxide (ITO) nanocrystals were coated onto polyethylene terephthalate (PET) films, and both films were sandwiched to improve the NIR absorption properties and protect the nanocrystal film layer. The fabricated films were applied to a model house and decreased the indoor temperature by approximately 8°C. Our study demonstrates that energy consumption can be reduced by ITO nanocrystal-coated flexible films, with potential implications for the smart window and mobility markets.

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