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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2017,Vol.33>> Issue(10)>> 2106-2112     doi: 10.3866/PKU.WHXB201705186         中文摘要
Investigation of the Growth Mechanism and Compositional Segregations of Monodispersed Ferrite Nanoparticles by Transmission Electron Microscopy
LIU Wei-Yan1, LI Ya-Dong1,2, LIU Tian1, GAN Lin1,2
1. Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong Province, P. R. China;
2. Electron Microscopy Laboratory, Materials and Devices Testing Center, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong Province, P. R. China
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Understanding the growth mechanism of nanocrystals is crucial for the synthesis of high-quality monodispersed nanoparticles. In contrast to the widely studied growth mechanism of metal nanocrystals, the growth mechanism of metal oxide nanoparticles is still poorly understood. Exemplified by cobalt/manganese ferrite nanoparticles prepared by thermal decomposition, we reveal the growth mechanism and associated compositional segregations of bimetallic metal oxide nanoparticles by using transmission electron microscopy combined with electron energy loss spectroscopy (EELS). We found that a two-stage heating protocol, involving a first-stage heating at a relatively lower temperature followed by a second-stage heating at a relatively higher temperature, is crucial to synthesize monodispersed ferrite nanoparticles. Controlling the reaction time of the first-stage heating can effectively decouple the nucleation stage and growth stage of ferrite nanoparticles, leading to monodispersed nanoparticles with a narrow size distribution. EELS spectrum imaging further reveals previously unreported compositional segregations in the as-prepared ferrite nanoparticles, suggesting that an Fe-rich core formed at the nucleation stage and a Co-/Mn-rich shell formed at the growth stage. Our results provide useful insight into the synthesis of high-quality monodispersed metal oxide nanoparticles as well as a correct understanding of the surface chemistry and related physiochemical properties of spinel oxide nanocrystals prepared by thermal decomposition.



Keywords: Nanocrystal growth mechanism   Ferrite nanocrystals   Surface segregation   Transmission electron microscopy   Electron energy loss spectroscopy  
Received: 2017-03-30 Accepted: 2017-05-02 Publication Date (Web): 2017-05-18
Corresponding Authors: GAN Lin Email: lgan@sz.tsinghua.edu.cn

Fund: The project was supported by the Guangdong Natural Science Foundation for Distinguished Young Scholars, China (2016A030306035) and Shenzhen Basic Research Program, China (JCYJ20160531194754308).

Cite this article: LIU Wei-Yan, LI Ya-Dong, LIU Tian, GAN Lin. Investigation of the Growth Mechanism and Compositional Segregations of Monodispersed Ferrite Nanoparticles by Transmission Electron Microscopy[J]. Acta Phys. -Chim. Sin., 2017,33 (10): 2106-2112.    doi: 10.3866/PKU.WHXB201705186

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