Synthesis and detection the oxidization of Co cores of Co@SiO2 core-shell nanoparticles by in situ XRD and EXAFS
Zhang, KH; Zhao, ZY; Wu ZH(吴忠华); Wu, ZH; Zhou, Y
刊名NANOSCALE RESEARCH LETTERS
2015
卷号10页码:37
关键词Core-shell nanoparticles Co@SiO2 In situ XRD/XAFS Synchrotron radiation techniques
学科分类Science & Technology - Other Topics; Materials Science; Physics
DOI10.1186/s11671-015-0756-z
文章类型Article
英文摘要In this paper, the Co@SiO2 core-shell nanoparticles were prepared by the sol-gel method. The oxidization of Co core nanoparticles was studied by the synchrotron radiation-based techniques including in situ X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) up to 800A degrees C in air and N-2 protection conditions, respectively. It was found that the oxidization of Co cores is undergoing three steps regardless of being in air or in N-2 protection condition. In the first step ranging from room temperature to 200A degrees C, the Co cores were dominated by Co-0 state as well as small amount of Co2+ ions. When temperature was above 300A degrees C, the interface between Co cores and SiO2 shells was gradually oxidized into Co2+, and the CoO layer was observed. As the temperature increasing to 800A degrees C, the Co cores were oxidized to Co3O4 or Co3O4/CoO. Nevertheless, the oxidization kinetics of Co cores is different for the Co@SiO2 in air and N-2 gas conditions. Generally, the O-2 in the air could get through the SiO2 shells easily onto the Co core surface and induce the oxidization of the Co cores due to the mesoporous nature of the SiO2 shells. However, in N-2 gas condition, the O atoms can only be from the SiO2 shells, so the diffusion effect of O atoms in the interface between Co core and SiO2 shell plays a key role.
类目[WOS]Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
收录类别SCI ; EI
WOS记录号WOS:000349356800001
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228101
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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Zhang, KH,Zhao, ZY,Wu ZH,et al. Synthesis and detection the oxidization of Co cores of Co@SiO2 core-shell nanoparticles by in situ XRD and EXAFS[J]. NANOSCALE RESEARCH LETTERS,2015,10:37.
APA Zhang, KH,Zhao, ZY,吴忠华,Wu, ZH,&Zhou, Y.(2015).Synthesis and detection the oxidization of Co cores of Co@SiO2 core-shell nanoparticles by in situ XRD and EXAFS.NANOSCALE RESEARCH LETTERS,10,37.
MLA Zhang, KH,et al."Synthesis and detection the oxidization of Co cores of Co@SiO2 core-shell nanoparticles by in situ XRD and EXAFS".NANOSCALE RESEARCH LETTERS 10(2015):37.
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