| || Synthesis of Cobalt Oxide Nanoparticles/Fibres in Alcoholic Medium using gamma-ray Technique
Author : Athawale, Anjali A.;Majumdar, Megha;Singh, Hema;Navinkiran, K.
Source : Defence Science Journal ; Vol:60(5) ; 2010 ; pp 507-513
Subject : 53 Applied Physics;Defence Science Journal
Keywords : Oxides;X-ray diffraction;X-ray photoelectron spectroscopy;XPS;optical properties;gamma irradiation technique;magnetic nanoparticles;UV-visible spectroscopy;spectroscopy;cobalt-oxide nanoparticles;nanoparticle synthesis
Abstract : Nanoparticles of cobalt oxides were synthesised by steady state g irradiation technique using various alcoholic salt solutions of cobalt ions with aniline acting as a stabiliser. Preliminary results were investigated using UV-vis and Fourier transform infra red analysis. The X-ray diffractograms revealed major peaks at 2q values of ~ 36.4°, 39.1°, 44.2°, and 65.7° corresponding to the Co3O4 phase and one peak at ~30.7° (100 per cent intensity) for Co2O3 phase. Lower alcohols yielded particles while fibres were formed in higher alcohols as observed from transmission electron microscopic analysis. Iso-propanol was observed to yield cobalt oxide nanoparticles with highest stability, conversion yield and homogeneity in size. The average measured diameter and length of these fibres were ~29 nm and 130 nm respectively. Energy dispersive spectroscopy supports the formation of cobalt oxide. The X-ray photoelectron spectroscopic results for iso-propanol sample show a peak at 781.6 eV confirming the formation of Co3O4.