K. , Jayanthi and Chawla, Santa and Joshi, Amish G. and Khan, Zahid H. and Kotnala, R. K. (2010) Fabrication of Luminescent, Magnetic Hollow Core Nanospheres and Nanotubes of Cr-Doped ZnO by Inclusive Coprecipitation Method. Journal of Physical Chemistry C, 114 (43). pp. 18429-18434. ISSN 1932-7455

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Abstract

Incorporation of Cr into ZnO lattice as a dopant in hollow core nanostructures has been achieved by coprecipitation in highly alkaline medium near room temperature. Energy dispersive spectroscopy and X-ray diffraction studies confirm the presence of Cr in the ZnO lattice and X-ray photoelectron spectroscopy (XPS)identified the dopant state to be Cr3+. Room temperature ferromagnetism in ZnO:Cr3+ along with structural investigations suggest an intrinsic nature of ferromagnetism in hollow core nanospheres. Unpaired spin in Cr3+ in zinc substitutional sites could create spin ordering and long-range ferromagnetic coupling. Higher Cr3+ concentration leads to the formation of hollow parallelepipeds and superparamagnetism. Photoluminescence studies reveal a sharp blue emission explicitly arising due to Cr doping. Such blue emitting magnetic nanocapsules can have immense potential as biocarriers and also in spintronics.

Item Type:	Article
Additional Information:	Copyright for this article belongs to American Chemical Society.
Subjects:	Chemistry Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	19 Apr 2012 06:20
Last Modified:	19 Apr 2012 06:20
URI:	http://npl.csircentral.net/id/eprint/157

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