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Growth of width-controlled nanowires MnO2 from mesoporous carbon and investigation of their properties

Published online by Cambridge University Press:  03 March 2011

Shenmin Zhu ,
Xiaolin Wang ,
Wei Huang ,
Deyue Yan ,
Honghua Wang  and
Di Zhang
Shenmin Zhu*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
Xiaolin Wang
Affiliation:
Spintronic and Electronic Materials Group, Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522, Australia
Wei Huang
Affiliation:
Coll. Chem. & Chem. Eng., State Key Lab Met Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
Deyue Yan
Affiliation:
Coll. Chem. & Chem. Eng., State Key Lab Met Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
Honghua Wang
Affiliation:
Coll. Chem. & Chem. Eng., State Key Lab Met Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
Di Zhang
Affiliation:
Coll. Chem. & Chem. Eng., State Key Lab Met Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: smzhu@sjtu.edu.cn
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Abstract

One-dimensional α-MnO2 nanowires with a controlled width of 10–20 nm have been developed by means of ultrasonic waves from mesoporous carbon using KMnO4 as the precursor. The formation mechanism has been proposed based on the results. A peak around 100 K was detected in the temperature-dependence of magnetization curve, indicating the ferromagnetic state in nanocomposite mesoporous carbon-MnO2, which is in agreement with the transition temperature found from the magnetization versus applied magnetic field curve. The magnetization versus temperature curve of the obtained MnO2 nanowires showed a magnetic transition at about 50 K, illustrating that a parasitic ferromagnetic component is composed on the antiferromagnetic structure of MnO2. The advantage of the method reported here is that phase-controlled synthesis of α-MnO2 nanowires was implemented regardless of pH, temperature, and types of ions in the reaction system. A major advantage of this approach is the efficient, fast, and reproducible control of width and the facile strategy to synthesize nanowires MnO2, in addition to the high purity of the resultant material.

Keywords

MicrostructureNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 11 , November 2006 , pp. 2847 - 2854
Copyright
Copyright © Materials Research Society 2006

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