Singhal, Sonal and Chawla, Amit Kumar and Gupta, Hari Om and Chandra, Ramesh (2009) Influence of Cobalt Doping on the Physical Properties of Zn0.9Cd0.1S Nanoparticles. Nanoscale Research Letters, 5 (2). pp. 323-331.
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Official URL: http://www.springerlink.com/content/86r7117n3q7277...
Zn0.9Cd0.1S nanoparticles doped with 0.005–0.24 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 (≤0.05 M) particle size, d XRD is ~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–Weiss temperature of −75 K with antiferromagnetic coupling was obtained for the high cobalt concentration.
|Uncontrolled Keywords:||Cobalt doping - Paramagnetism - Quantum confinement|
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nanoelectronics
Physical Science > Nanomagnetics
|Deposited By:||Lesley Tobin|
|Deposited On:||12 Feb 2010 14:28|
|Last Modified:||12 Feb 2010 14:28|
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