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Studies on Structural and Optical Properties of Zno and Mn-doped ZnO Nanopowders


Affiliations
1 Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India
 

Well-crystalline ZnO nanoparticles (NPs) were synthesized in large-quantity via sol-gel process using the mixtures of zinc acetate and citric acid. The detailed structural properties were examined using x-ray diffraction pattern (XRD) and scanning electron microscope (SEM) which revealed that the synthesized nanoparticles are well-crystalline and possessing wurtzite hexagonal phase. Crystalline size, lattice parameters, unit cell volume and atomic packing fraction were determined from the obtained XRD data. The presence of functional groups in the samples was observed from FTIR spectra. The optical properties were studied by using UV visible spectroscopy. The nanoparticles are almost spherical shape with the average diameters of 15±10 nm.We also tried to study the effect on the structural and optical properties of Mn doped ZnO nanoparticles. The absorption edge shifts towards lower energy upto 0.1 at% doping concentration and shifts to higher energy when the Mn doping concentration increases upto 0.2 at % due to Burstein-Moss effect.

Keywords

ZnO, Doped ZnO, Sol Gel, Burstein-moss Effect
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  • Studies on Structural and Optical Properties of Zno and Mn-doped ZnO Nanopowders

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Authors

Arun S. Menon
Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India
Nandakumar Kalarikkal
Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India
Sabu Thomas
Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India

Abstract


Well-crystalline ZnO nanoparticles (NPs) were synthesized in large-quantity via sol-gel process using the mixtures of zinc acetate and citric acid. The detailed structural properties were examined using x-ray diffraction pattern (XRD) and scanning electron microscope (SEM) which revealed that the synthesized nanoparticles are well-crystalline and possessing wurtzite hexagonal phase. Crystalline size, lattice parameters, unit cell volume and atomic packing fraction were determined from the obtained XRD data. The presence of functional groups in the samples was observed from FTIR spectra. The optical properties were studied by using UV visible spectroscopy. The nanoparticles are almost spherical shape with the average diameters of 15±10 nm.We also tried to study the effect on the structural and optical properties of Mn doped ZnO nanoparticles. The absorption edge shifts towards lower energy upto 0.1 at% doping concentration and shifts to higher energy when the Mn doping concentration increases upto 0.2 at % due to Burstein-Moss effect.

Keywords


ZnO, Doped ZnO, Sol Gel, Burstein-moss Effect

References