In Situ Study of Fe3Pt-Fe2O3 Core-Shell Nanoparticle Formation.

Autor: Liang WI; Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 300, Taiwan.; Materials Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Zhang X; Materials Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.; National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Centre of Advanced Microstructures, Nanjing University , Nanjing 210093, China., Zan Y; School of Biomedical Engineering, Shanghai Jiao Tong University , Shanghai 200030, China., Pan M; Gatan, Inc. , 5794 West Las Positas Boulevard, Pleasanton, California 94588, United States., Czarnik C; Gatan, Inc. , 5794 West Las Positas Boulevard, Pleasanton, California 94588, United States., Bustillo K; Molecular Foundry, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Xu J; National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Centre of Advanced Microstructures, Nanjing University , Nanjing 210093, China., Chu YH; Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 300, Taiwan.; Institute of Physics, Academia Sinica , Taipei 105, Taiwan., Zheng H; Materials Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.; Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.
Jazyk: angličtina
Zdroj: Journal of the American Chemical Society [J Am Chem Soc] 2015 Dec 02; Vol. 137 (47), pp. 14850-3. Date of Electronic Publication: 2015 Nov 19.
DOI: 10.1021/jacs.5b10076
Abstrakt: We report an in situ study of Fe3Pt-Fe2O3 core-shell nanoparticle growth using liquid cell transmission electron microscopy. By controlling the Fe-to-Pt ratio in the precursor solution, we achieved the growth of nanoparticles with the formation of an iron-platinum alloy core followed by an iron oxide shell in the electron beam-induced reactions. There was no substantial change in the growth kinetics of the iron oxide shell after the Fe-Pt alloy core stopped growing. The core growth was arrested by depletion of the Pt precursor. Heteroepitaxy of Fe3Pt [101] (core)||α-Fe2O3 [111] (shell) was observed in most of the nanoparticles, while a polycrystalline iron oxide shell is developed eventually for strain relaxation. Our studies suggest that Pt atoms catalyze the reduction of Fe ions to form the Fe3Pt alloy core, and when Pt is depleted, a direct precipitation of iron oxide results in the core-shell nanostructure formation.
Databáze: MEDLINE
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