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MoO2微米空心球的水热合成及合成机理研究
郭成花 , 张贵军 , 沈铸睿 , 孙平川 , 袁忠勇 , 金庆华 , 李宝会 , 丁大同 , 陈铁红
南开大学物理学院,化学学院,天津300071
摘要:
在阳离子表面活性剂的作用下,以钼酸铵为钼源,乙醇作为还 原剂合成了微米级MoO2空心球. 采用X射线粉末衍射、热重-差热、 扫描电子显微镜、透射电镜和X射线光电子能谱对合成的样品进行了 表征,并对MoO2空心球可能的形成机理进行了讨论. 在MoO2空心球 的形成过程中,发现了样品从"大块-实心球-空心球"的形貌转化过 程,空心球的形成机理可用微米尺度的Kirkendall效应解释.
关键词:  MoO2,微米空心球,阳离子表面活性剂
DOI:10.1360/cjcp2006.19(6).543.6
分类号:
基金项目:
Hydrothermal Synthesis and Formation Mechanism of Micrometer-sized MoO2 Hollow Spheres
Cheng-hua Guo, Gui-jun Zhang, Zhu-rui Shen, Ping-chuan Sun, Zhong-yong Yuan, Qing-hua Jin*, Bao-hui Li, Da-tong Ding, Tie-hong Chen*
College of Chemistry and College of Physics, Nankai University, Tianjin 300071, China
Abstract:
Micrometer-sized MoO2 hollow spheres were synthesized hydrothermally with ammonium heptamolybdate tetrahydrate as molybdenum source, Cetyltrimethylammonium bromide as structure-directing agent and C2H5OH as reducing agent, respectively. The products were investigated by X-ray diffraction, thermo- gravimetry and differential thermal analysis, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. A morphology transition of "blocks-solid spheres-hollow spheres" during the growth process was observed and the possible mechanism for the formation of MoO2 samples was proposed to be through a microscale Kirkendall effect.
Key words:  MoO2, Micrometer-sized hollow spheres, Cationic surfactants