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Influence of Cobalt Doping on the Physical Properties of Zn0.9Cd0.1S Nanoparticles

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...

Abstract

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.

Item Type:Article
Uncontrolled Keywords:Cobalt doping - Paramagnetism - Quantum confinement
Subjects:Physical Science > Nanophysics
Physical Science > Nanoelectronics
Physical Science > Nanomagnetics
ID Code:8161
Deposited By:Lesley Tobin
Deposited On:12 Feb 2010 14:28
Last Modified:12 Feb 2010 14:28

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