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Fabrication and properties of Co doped ZnO spherical assemblies

DSpace at IIT Bombay

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Title Fabrication and properties of Co doped ZnO spherical assemblies
 
Creator BARICK, KC
ASLAM, M
BAHADUR, D
 
Subject Nanocrystals
Transition metal doped ZnO
Oriented attachment
Defect
Clustered assembly
ROOM-TEMPERATURE FERROMAGNETISM
THIN-FILMS
NANOCRYSTALS
DEFECTS
SEMICONDUCTOR
MAGNETISM
NANORODS
ARRAYS
BULK
 
Description Spherical assemblies of Co doped ZnO comprised of numerous nanocrystals of size 10-15 nm were prepared by refluxing their acetate precursors in diethylene glycol medium. The detailed structural analysis by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM) reveal that Co ions are successfully incorporated into the hexagonal wurtzite ZnO nanostructure and do not appear as precipitates or secondary phases. These Co ions are uniformly distributed in the ZnO host lattice and exist in +2 oxidation state. Further, HRTEM analysis also confirmed the oriented attachment of nanocrystals as well as their defects structure. Raman spectra clearly indicate the incorporation of Co2+ ions into ZnO nanostructures at Zn2+ site (appearance of an additional Raman mode at 527 cm (1)) and the resulted defects and lattice disorder in host lattice (shifting, broadening and weakening of 2E(2) (low) and E-2 (high) phonon modes). These Co doped ZnO samples exhibit ferromagnetic like behavior at room temperature, presumably due to the presence of defects in host ZnO lattice. (C) 2013 Elsevier B. V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:03:56Z
2014-12-28T17:03:56Z
2014
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 587282-286
0925-8388
1873-4669
http://dx.doi.org/10.1016/j.jallcom.2013.10.206
http://dspace.library.iitb.ac.in/jspui/handle/100/16955
 
Language English