김동하 차준회 심기웅 김윤화 장지수 신하민 안재완 최성율 김일두 2024-01-19T12:30:47Z 2024-01-19T12:30:47Z 2022-02-17 2022-04 2451-9308 https://pubs.kist.re.kr/handle/201004/115488 Momentary thermal annealing techniques based on the generation of photo-excited electrons in materials have been applied for ultrafast optical sintering in carbon, metal, and narrow-band-gap black-colored oxides. However, activating the photothermal effect for white-colored oxides is a grand challenge due to their low photo thermal conversion efficiencies. Here, we report remarkably enhanced photothermal effects on binary, white-colored tin oxide (SnO2) via a flash-thermal shock (FTS) lamping, which are triggered by low thermal conductivity of polycrystalline nanosheets with abundant defects. These features enable momentary high -temperature annealing (temperature 1,800 degrees C and duration <20 ms) in SnO2 under ambient air. Importantly, the FTS process facilitates thermochemical tuning of crystal structures in bulk SnO2 lattice and the simultaneous ultrafast synthesis of multi-elemental nanoparticles (<10 nm) and/or single-atom catalyst on the host tin oxides. To prove their practical utility, we demonstrated the exceptional chemiresistive gas-sensing capabilities with microelectromechanical systems. English CELL PRESS Flash-thermochemical engineering of phase and surface activity on metal oxides Article 10.1016/j.chempr.2021.12.003 1 CHEM, v.8, no.4, pp.1014 - 1033 CHEM 8 4 1014 1033 N scie scopus 000798506000016 Chemistry, Multidisciplinary Chemistry Article SNO2 SEMICONDUCTOR NANOPARTICLES TEMPERATURE NANOCRYSTALS SENSITIVITY TRANSITION NANOFIBERS CATALYSTS SHOCK