Chem. J. Chinese Universities

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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

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

CLC Number: 

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