One-Pot Synthesis of Highly Crystallined -MnO2 Nanodisks Assembled from Nanoparticles: Morphology Evolutions and Phase Transitions

J. Phys. Chem. C, 112 (2), 365 -369, 2008. 10.1021/jp0743875 S1932-7447(07)04387-7
Web Release Date: December 19, 2007

One-Pot Synthesis of Highly Crystallined -MnO₂ Nanodisks Assembled from Nanoparticles: Morphology Evolutions and Phase Transitions

Ning Wang, Xia Cao, Lin He, Wei Zhang, Lin Guo,* Chinping Chen,* Rongming Wang, and Shihe Yang*

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China, Department of Physics, Peking University, Beijing 100871, China, School of Science, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China, and Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Received: June 6, 2007

In Final Form: September 13, 2007

Abstract:

Manganese oxides are important materials in many applications. We describe, for the first time, the facile one-pot synthesis of highly crystallined -MnO₂ nanodisks assembled from nanoparticles through a novel wet chemical route. Morphology evolutions, magnetic properties, and phase transitions are also studied by transmission electron microscopy, scanning electron microscopy and thermal gravimetric analysis. A mechanism for the formation of the -MnO₂ nanodisks as well as their inner structure is proposed based on controlled experiments. The key to the successful preparation of this novel MnO₂ nanostructure has been a synergic control of a surfactant, polyvinylpyrrolidone, and a solvent, dimethyl sulfoxide, capable of stabilizing the microreactors and promoting the assembly of manganese nanoparticles.

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