Spontaneous organisation of ZnS nanoparticles into monocrystalline nanorods with highly enhanced dopant-related emission

Manzoor, K and Aditya, V and Vadera, SR and Kumar, N and Kutty, TRN (2005) Spontaneous organisation of ZnS nanoparticles into monocrystalline nanorods with highly enhanced dopant-related emission. In: Journal of Physics and Chemistry of Solids, 66 (7). pp. 1164-1170.

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Abstract

A natural self-assembly process of semiconductor nanoparticles leading to the formation of doped, monocrystalline nanorods with highly enhanced dopant-related luminescence properties is reported. similar to 4 nm sized, polycrystalline ZnS nanoparticles of zinc-blende (cubic)structure, doped with $Cu^{+}-Al^{3+}$ or $Mn^{2+}$ have been aggregated in the aqueous solution and grown into nanorods of length similar to 400 nm and aspect ratio similar to 12. Transmission electron microscopic (TEM)images indicate crystal growth mechanisms involving both Ostwald-ripening and particle-to-particle oriented-attachment.Sulphur-sulphur catenation is proposed for the covalent-linkage between the attached particles. The nanorods exhibit self-assembly mediated quenching of the lattice defect-related emission accompanied by multifold enhancement in the dopant-related emission. This study demonstrates that the collective behavior of an ensemble of bare nanoparticles, under natural conditions, can lead to the formation of functionalized (doped) nanorods with enhanced luminescence properties.

Item Type:	Journal Article
Publication:	Journal of Physics and Chemistry of Solids
Publisher:	Elsevier Science
Additional Information:	Copyright for this article belongs to Elsevier Science.
Keywords:	A. Semiconductor;A. Nanostructures;B. Crystal growth;D. Luminescence
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	28 Sep 2005
Last Modified:	01 Mar 2012 09:54
URI:	http://eprints.iisc.ac.in/id/eprint/3736

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