標題: In Situ Study of Fe3Pt-Fe2O3 Core-Shell Nanoparticle Formation
作者: Liang, Wen-I
Zhang, Xiaowei
Zan, Yunlong
Pan, Ming
Czarnik, Cory
Bustillo, Karen
Xu, Jun
Chu, Ying-Hao
Zheng, Haimei
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 2-Dec-2015
摘要: We report an in situ study of Fe3Pt-Fe2O3 coreshell 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 ironplatinum 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 FePt alloy core stopped growing. The core growth was arrested by depletion of the Pt precursor. Heteroepitaxy of Fe3Pt [101] (core)||alpha-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.
URI: http://dx.doi.org/10.1021/jacs.5610076
http://hdl.handle.net/11536/129340
ISSN: 0002-7863
DOI: 10.1021/jacs.5610076
期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume: 137
Issue: 47
起始頁: 14850
結束頁: 14853
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