%0 Journal Article
%T Influence of Cobalt Doping on the Physical Properties of Zn0.9Cd0.1S Nanoparticles
%A Singhal Sonal
%A Chawla Amit Kumar
%A Gupta Hari Om
%A Chandra Ramesh
%J Nanoscale Research Letters
%D 2009
%I Springer
%X Zn0.9Cd0.1S nanoparticles doped with 0.005¨C0.24 M cobalt have been prepared by co-precipitation technique in ice bath at 280 K. For the cobalt concentration >0.18 M, XRD pattern shows unidentified phases along with Zn0.9Cd0.1S sphalerite phase. For low cobalt concentration (¡Ü0.05 M) particle size, d XRDis ~3.5 nm, while for high cobalt concentration (>0.05 M) particle size decreases abruptly (~2 nm) as detected by XRD. However, TEM analysis shows the similar particle size (~3.5 nm) irrespective of the cobalt concentration. Local strain in the alloyed nanoparticles with cobalt concentration of 0.18 M increases ~46% in comparison to that of 0.05 M. Direct to indirect energy band-gap transition is obtained when cobalt concentration goes beyond 0.05 M. A red shift in energy band gap is also observed for both the cases. Nanoparticles with low cobalt concentrations were found to have paramagnetic nature with no antiferromagnetic coupling. A negative Curie¨CWeiss temperature of  75 K with antiferromagnetic coupling was obtained for the high cobalt concentration.
%K Cobalt doping
%K Paramagnetism
%K Quantum confinement
%U http://dx.doi.org/10.1007/s11671-009-9483-7