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|Title:||Size dependent dielectric properties of Co and Fe doped SnO2 nanoparticles and their nanorods by Ce co-doping|
Kotnala, R K
Verma, Kuldeep Chand
|Abstract:||Structural, microstructural and dielectric properties of transition metal doped, i.e., Co and Fe (0, 1, 3 and 5 mol% each) SnO2 and the formation of their nanorods by Ce (4 mol%) co-doping have been studied. These nanoparticles and nanorods were fabricated by a chemical route using polyvinyl alcohol as surfactant. The X-ray diffraction patterns show that all the specimens have tetragonal rutile structure without any extra phase. The transmission electron microscopy analysis shows that the average particle size lies in the range 11-30 nm and the diameter of rods in the range 5-20 nm and length 50-200 nm. It is observed that by co-doping of Ce3+, the resulting nanoparticles assembled themselves into rod like structures. The nature and concentration of dopants are found to play crucial role in tuning the morphology and electrical properties of nanostructures. The dielectric behaviour of Co and Fe doped and Ce co-doped SnO2 nanostructures has been analyzed and it is observed that the value of dielectric constant (εr) decreases rapidly in lower frequency regime, whereas it depicts a slight dispersion in the middle and higher frequency range and resonant behaviour in sufficiently higher frequency region. The frequency dependent ac conductivity shows higher resistivity of nanoparticles and explains the dispersion in dielectric behaviour.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.50(01) [January 2012]|
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