Facile controlled synthesis and growth mechanisms of flower-like and tubular MnO2 nanostructures by microwave-assisted hydrothermal method

Yongliang Li; Jiajun Wang; Yong Zhang; Mohammad Norouzi Banis; Jian Liu; Dongsheng Geng; Ruying Li; Xueliang Sun

doi:10.1016/j.jcis.2011.12.013

Facile controlled synthesis and growth mechanisms of flower-like and tubular MnO2 nanostructures by microwave-assisted hydrothermal method

J Colloid Interface Sci. 2012 Mar 1;369(1):123-8. doi: 10.1016/j.jcis.2011.12.013. Epub 2011 Dec 13.

Authors

Yongliang Li¹, Jiajun Wang, Yong Zhang, Mohammad Norouzi Banis, Jian Liu, Dongsheng Geng, Ruying Li, Xueliang Sun

Affiliation

¹ Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada.

PMID: 22221341
DOI: 10.1016/j.jcis.2011.12.013

Abstract

Birnessite flower-like and α-type tubular MnO(2) nanostructures were selectively synthesized through simple decomposition of KMnO(4) under hydrochloric acid condition by controlling reaction temperature using a microwave-assisted hydrothermal method. The as-prepared samples were characterized in detail by various techniques including X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform-infrared spectroscopy, and Raman scattering spectroscopy. While the growth of flower-like birnessite-MnO(2) might follow a widely accepted Ostwald ripening process, we proposed a formation mechanism of the nanotubular α-MnO(2) based on our evidence, which was assembly of nanorods through an "oriented attachment" process.