Shape-selective synthesis, magnetic properties, and catalytic activity of single crystalline beta-MnO2 nanoparticles

Jana, Subhra, Basu, Soumen, Pande, Surojit, Ghosh, Sujit Kumar and Pal, Tarasankar (2007) Shape-selective synthesis, magnetic properties, and catalytic activity of single crystalline beta-MnO2 nanoparticles. Journal of Physical Chemistry C, 111 44: 16272-16277. doi:10.1021/jp074803l


Author Jana, Subhra
Basu, Soumen
Pande, Surojit
Ghosh, Sujit Kumar
Pal, Tarasankar
Title Shape-selective synthesis, magnetic properties, and catalytic activity of single crystalline beta-MnO2 nanoparticles
Formatted title
Shape-selective synthesis, magnetic properties, and catalytic activity of single crystalline β-MnO2 nanoparticles
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
Publication date 2007-11-08
Sub-type Article (original research)
DOI 10.1021/jp074803l
Volume 111
Issue 44
Start page 16272
End page 16277
Total pages 6
Place of publication Washington DC, U.S.A.
Publisher American Chemical Society
Language eng
Subject 1007 Nanotechnology
0306 Physical Chemistry (incl. Structural)
Abstract The shape-controlled synthesis of exclusively single crystalline β-MnO2, nanospheres on one hand and nanorods on the other, has been achieved through air oxidation of MnCl2 in variable SDBS micellar templates under alkaline condition at room temperature. Raman measurement and TEM unequivocally confirm the changes in the structural aspects of the particles from sphere to rod. Field-dependent magnetization measurement indicates superparamagnetic nature of MnO2 rods and spheres having a blocking temperature of 4 and 40 K, respectively. These observations together with other physical parameters explicitly confirm the changes in the structural aspects of the particles with the changes in surfactant concentration. Thus, nanorods of high aspect ratio (25) were obtained exclusively leaving aside the embryonic spherical particles (5 ± 2 nm) at lower surfactant concentration. This Article also focuses for the first time on the change in magnetic properties and cyclic voltammograms when we enroute nanospheres to nanorods. The catalytic activity of spherical and rod shaped particles has also been demonstrated.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sat, 16 Jan 2010, 00:34:42 EST by Ms Lynette Adams on behalf of Aust Institute for Bioengineering & Nanotechnology