2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Preparation and Characterization of Manganese Oxide Nanowhiskers

J. Yun, C. Du, N. Browning and N. Pan
Kyungnam University, KR

HREM, hybrid nanostructure, soft chemistry template synthesis, defects

Manganese oxide is used for catalyst in organic chemistry, electrode for lithium ion batteries, and magnetic materials. When manganese oxide is in a form of powder, wire, or whisker and in nanometer sizes, it would show higher activity and efficiency. In this study, we prepared nano-size whiskers of manganese oxide by the soft chemistry templating synthesis method, and characterized them by electron microscopy and spectroscopy. Nano-size whiskers were prepared from manganese chloride solution with an addition of directing agent polymers. It was noted that nano-size whiskers grew from the surface of nano-size particles of hausmannite, Mn3O4. The structure and chemistry of whiskers were analyzed by using transmission electron microscopy, electron energy loss spectroscopy, and energy dispersive x-ray spectrometry. It was found that most nanowhiskers had nano-size domains of short-range ordered point-type defects. Atomic ratio of oxygen to manganese varied in a range of 0.7-1.6 showing that manganese oxide nanowhiskers with various chemistry were grown from hausmannite nanoparticles.

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