Spectral Design of Nano-Cerates for Emerging Passive Radiative Cooling Technologies: Theory Boosts Experiments.
basic_science · Level V
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- Record sourced from PubMed, PMID 39573820.
- Also identified by DOI 10.1021/acs.nanolett.4c04891.
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Abstract
Cerate nanoceramics have been recently considered to be key materials for radiative thermal management and enhanced solar reflectance. Herein, we demonstrate by means of first-principles density functional theory calculations how experimentally prepared La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> and Al<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> materials with defective fluorite structure exhibit superior temperature stability, strong UV-vis/near-infrared reflectance, and tunable mid-infrared emissivity, thus representing excellent host matrices for doping-controlled chromatic and thermal properties. By means of phonon dispersion analysis, we demonstrate how disorder and aluminum impurities induce locally distorted chemical environments that can be exploited for achieving selective infrared emittance for passive radiative cooling devices.