Gigantic Thermal Shielding in 2D Oxide Nanosheets.
basic_science · Level V
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- Record sourced from PubMed, PMID 37191626.
- Also identified by DOI 10.1021/acsnano.3c00815.
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Abstract
Thermal shielding materials that can block near-infrared (NIR) light from the sunlight while maintaining visible transparency have become increasingly important from an energy-saving perspective. Here, we demonstrate a gigantic NIR shielding by an engineered plasmonic material based on a two-dimensional (2D) polytungstate (Cs<sub>4-<i>x</i></sub>W<sub>11</sub>O<sub>35-<i>d</i></sub>). Starting from a charge-neutral polytungstate (Cs<sub>4</sub>W<sub>11</sub>O<sub>35</sub>), we synthesize charge-imbalanced 2D nanosheets (Cs<sub>4-<i>x</i></sub>W<sub>11</sub>O<sub>35-<i>d</i></sub>) that undergo an unusual structural change with the semiconductor-to-metal transition in a reduced atmosphere. Layer-by-layer engineering of the 2D nanosheets enables a plasmon-induced enhancement of the NIR reflectance (>53%) with a high visible transparency (>71%), realizing high-performance thermal shielding. Our approach offers a solution for future thermal management technology.