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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/10055

Title: Defects in three-dimensional spherical assemblies of Ni-doped ZnO nanocrystals
Authors: BARICK, KC
ASLAM, M
WU, JS
DRAVID, VP
BAHADUR, D
Keywords: thin-films
temperature ferromagnetism
room-temperature
zinc-oxide
nanoparticles
aggregation
Issue Date: 2009
Publisher: MATERIALS RESEARCH SOC
Citation: JOURNAL OF MATERIALS RESEARCH, 24(12), 3543-3550
Abstract: Three-dimensional spherical assemblies of Ni-doped ZnO nanocrystals have been prepared by the solution phase synthesis process. It has been observed that transition metal ions (Zn, Ni) are uniformly distributed in the sample and exist in the +2 oxidation state. Detailed investigation of structural defects formed during the formation of spherical assemblies by oriented attachment of nanocrystals was carried out by high-resolution transmission electron microscope (HRTEM), Raman and photoluminescence (PL) spectroscopy. HRTEM analysis revealed the existence of various crystal defects, such as stacking faults, dislocations, etc. The incorporation of W, into ZnO structure strongly influences the vibrational and optical properties of the sample due to the increment of defect densities. Compared to the optical phonons of ZnO, an additional mode observed at 538 cm(-1) in Raman spectra of Ni-doped ZnO could be associated with the incorporation of Ni(2+) in Zn(2+) site. The increase in PL intensity of green emission with Ni(2+) doping indicates the formation of a higher concentration of oxygen vacancy in doped nanostructures.
URI: http://dx.doi.org/10.1557/JMR.2009.0446
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10055
http://hdl.handle.net/10054/10055
ISSN: 0884-2914
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