高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

纳米结构MnO2的水热合成、晶型及形貌演化

李英品, 周晓荃, 周慧静, 沈铸睿, 陈铁红   

  1. 南开大学化学学院, 材料化学系, 天津 300071
  • 收稿日期:2007-01-22 修回日期:1900-01-01 出版日期:2007-07-10 发布日期:2007-07-10
  • 通讯作者: 陈铁红

Hydrothermal Preparation of Nanostructured MnO2 and Morphological and Crystalline Evolution

LI Ying-Pin, ZHOU Xiao-Quan, ZHOU Hui-Jing, SHEN Zhu-Rui, CHEN Tie-Hong*   

  1. Department of Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2007-01-22 Revised:1900-01-01 Online:2007-07-10 Published:2007-07-10
  • Contact: CHEN Tie-Hong

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摘要：

以水热合成方法制备了具有不同微观形貌的纳米结构MnO2, 并以X射线衍射(XRD), 扫描电镜(SEM)和X射线光电子能谱(XPS)等方法对其进行了表征. 跟踪考察了二氧化锰的晶型及微观形貌随水热反应时间的演变过程, 在Ostwald ripening机理作用下, MnO2晶型转化过程为γ-MnO2, α-MnO2和β-MnO2, 同时形貌由微米球转变为海胆结构、空心海胆结构和纳米线.

关键词: 二氧化锰, 水热合成, 晶型, 核壳结构, 纳米线

Abstract:

Manganese dioxides with various morphologies were prepared with a common hydrothermal method without any templates or additives. The morphological evolution was accompanied with the conversion of the polymorphic forms, gradually from γ-type to β-type. Meanwhile, MnO2 microspheres, urchinlike nanostructures and nanowires were successfully synthesized. The products were characterized via X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscope. The process can be explained with Ostwald-Ripening mechanism.

Key words: MnO2, Hydrothermal preparation, Crystal type, Core-shell structure, Nanowires

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