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

被引：54

作者：

Liang, Wen-I ^{[1
,2
]}

Zhang, Xiaowei ^{[2
,3
,4
]}

Zan, Yunlong ^{[5
]}

Pan, Ming ^{[6
]}

Czarnik, Cory ^{[6
]}

Bustillo, Karen ^{[7
]}

Xu, Jun ^{[3
,4
]}

Chu, Ying-Hao ^{[1
,8
]}

Zheng, Haimei ^{[2
,9
]}

机构：

[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Nanjing Univ, Sch Elect Sci & Engn, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[4] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[5] Shanghai Jiao Tong Univ, Sch Biomed Engn, Shanghai 200030, Peoples R China

[6] Gatan Inc, Pleasanton, CA 94588 USA

[7] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA

[8] Acad Sinica, Inst Phys, Taipei 105, Taiwan

[9] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2015年 / 137卷 / 47期

关键词：

ONE-POT SYNTHESIS; REDUCTION; GROWTH; EVOLUTION; KINETICS; AU;

D O I：

10.1021/jacs.5b10076

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页码：14850 / 14853

页数：4

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