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Evolution of ZnO nanoparticles and nanorods: aspect ratio dependent optoelectronic properties

Published online by Cambridge University Press:  23 December 2010

U. Das  and
D. Mohanta
U. Das
Affiliation:
Nanoscience Laboratory, Department of Physics, Tezpur University, P.O. Napaam, Tezpur 784028, Assam, India
D. Mohanta*
Affiliation:
Nanoscience Laboratory, Department of Physics, Tezpur University, P.O. Napaam, Tezpur 784028, Assam, India
*
best@tezu.ernet.in
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Abstract

Zinc oxide (ZnO) nanorods, with different aspect ratios, were synthesised at room temperature via an inexpensive physico-chemical route. The source material was a mixture of zinc acetate dihydrate [ Zn (CH3 COO)2 $\cdot$ 2H2O] , cetyl-trimethyl ammonium bromide [ C19H42BrN] , and sodium hydroxide [NaOH]. The length of the nanorods, as a result of restricted directional growth, was controlled by means of varying the molar ratios of the reactants. As revealed by X-ray diffraction measurements, the as-grown ZnO nanorods exhibited wurtzite crystalline phase, with preferred crystallographic orientation along (101) plane. The visual evidence of the formation of ZnO nanorods was confirmed by transmission electron microscopy studies. The photoluminescence spectra of the ZnO systems show two prominent peaks: a sharp peak located at ~375 nm (UV band) and a broad band peaking at ~480 nm (green band). The UV-to-green PL intensity ratio was found to be improved with enhanced aspect ratio. The aspect ratio dependent tunable optical responses would provide better insight to understand the radiative and non-radiative processes in elongated nanosystems.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 1 , January 2011 , 10602
Copyright
© EDP Sciences, 2010

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