Effect of neodymium doping on structure, electrical and optical properties of nanocrystalline ZnO

In this paper, we report effect of Nd doping on structure, electrical and optical properties of nanocrystalline ZnO prepared through a modified ceramic route. The X-ray diffraction and transmission electron microscopy studies reveal that annealed samples are single phase, pure nanocrystalline ZnO. T...

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Bibliographic Details
Published in:Materials characterization 2012-08, Vol.70 (Complete), p.1-7
Main Authors: Roy, B., Chakrabarty, S., Mondal, O., Pal, M., Dutta, A.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ANNEALING
CERAMICS
CONCENTRATION RATIO
Cross-disciplinary physics: materials science
rheology
CRYSTALS
Direct current
DOPED MATERIALS
Doping
ELECTRIC CONDUCTIVITY
Electrical conductivity
Electrical measurement
ENERGY GAP
Exact sciences and technology
MATERIALS SCIENCE
Nanocrystalline Nd-doped ZnO
Nanocrystals
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
NEODYMIUM
Optical band gap
OPTICAL PROPERTIES
PARTICLE SIZE
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Solidification
TEMPERATURE DEPENDENCE
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION
Zinc oxide
ZINC OXIDES
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Summary:In this paper, we report effect of Nd doping on structure, electrical and optical properties of nanocrystalline ZnO prepared through a modified ceramic route. The X-ray diffraction and transmission electron microscopy studies reveal that annealed samples are single phase, pure nanocrystalline ZnO. The optical band gap for different compositions, estimated from ultraviolet–visible spectroscopy study, shows a little increasing tendency while doped with Nd for the samples annealed at lower temperature. The dc electrical conductivity of the samples decreases with the increase in Nd concentration. The ac electrical measurements prove the hopping conduction as the dominant mechanism. The results are being explained on the basis of band structural change due to Nd doping in the host lattice and by Correlated Barrier Hopping model. ► Particle size increases when it is doped (from XRD). ► XRD peak shifted to lower angle when doped. ► The dc conductivity decreases with the increase of Nd dopant concentrations. ► The temperature dependent ac conductivity follows the universal power law.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2012.04.015