Size Dependence of Magnetic and Optical Properties of Co_3O_4 Nanoparticles

• Authors: A. Sarfraz , S. Hasanain
• Languages of publication: EN

Abstracts

EN

The effect of particle size on the magnetic and optical properties of cobalt oxide Co_3O_4 has been investigated. Single phase Co_3O_4 nanoparticles were synthesized by co-precipitation route and their structure was confirmed through X-ray diffraction analysis. The average crystallite sizes of the nanoparticles as determined from the X-ray diffraction were found to lie in the range of 13 to 59 nm. At room temperature these particles show paramagnetic response and the DC magnetic moment of the samples showed an increasing trend with increasing particle size. Both the antiferromagnetic Néel temperature T_{N} and the low temperature moment depict finite size effects in the AC susceptibility measurements. The optical absorption studies show that there are two direct band gaps in Co_3O_4, the main energy band gap and a sub-band located inside the main energy gap. The values of these energy band gaps for the 45 nm particles were determined to be 3.15 and 1.76 eV, respectively. The direct band gap in these particles clearly shows a blue shift with decreasing size attributable to the quantum confinement effect.

Keywords

EN

81.05.Gc; 61.05.cp; 75.75.-c; 78.66.-w

Discipline

• 78.66.-w: Optical properties of specific thin films(for optical properties of low-dimensional, mesoscopic, and nanoscale materials, see 78.67.-n; for optical properties of surfaces, see 78.68.+m)
• 81.05.Gc: Amorphous semiconductors
• 75.75.-c: Magnetic properties of nanostructures
• 61.05.cp: X-ray diffraction

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 1
• Pages: 139-144

Dates

published

2014-01

received

2013-03-28

(unknown)

2013-10-10

Contributors

author

A. Sarfraz

• Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan

author

S. Hasanain

• Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan

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Identifiers

DOI

10.12693/APhysPolA.125.139