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现场研究Fe3Pt-Fe2O3核心外纳米粒子形成

Wen-I Liang^1,2, Xiaowei Zhang^2,3, Yunlong Zan⁴

¹Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 300, Taiwan.

Journal of the American Chemical Society

|November 15, 2015

概括

我们使用电子显微镜观察铁合金核心和铁氧化物外的纳米粒子生长. 前体的枯竭阻止了核心的生长,导致氧化铁的形成.

科学领域:

材料科学
纳米技术
物理化学

背景情况:

核心外纳米粒子为各种应用提供独特的特性.
了解双金属和金属氧化物纳米结构的现场生长机制对于受控合成至关重要.

研究的目的:

研究铁合金核心-氧化铁外纳米粒子的现场生长动态.
阐明前体比和电子束诱导反应在纳米粒子形成中的作用.
确定核心外结构中的表关系和应变放松机制.

主要方法:

在现场使用液体细胞传导电子显微镜 (LC-TEM).
在前体溶液中控制铁与比率的变化.
在电子束照射下分析纳米粒子生长动力学和结构演变.

主要成果:

已成功合成Fe3Pt-Fe2O3核心外纳米粒子.
核心增长受到前体耗尽的限制.
观察到异质皮质生长 (Fe3Pt [101] Variable α-Fe2O3 [111]),随后形成多晶外以缓解应变.
被确定为铁合金核心形成的催化剂.

结论:

这项研究揭示了Fe3Pt-Fe2O3核心纳米粒子形成的详细机制.
在合金核心形成中的催化作用及其耗尽驱动的外生长是关键发现.
观察到的异质和随后的应变放松为核心纳米结构的结构发展提供了洞察力.

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