Synthesis and optical study of heat-treated ZnO nanopowder for optoelectronic applications

UV emitting ZnO nanopowder was chemically synthesized and subsequently subjected to heat treatment in oxygen atmosphere for potential optoelectronic properties. Characterization including Raman spectroscopy, photoluminescence, SEM, FT-IR and XRD were performed to see the effect of high temperature h...

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Bibliographic Details
Published in:Bulletin of materials science 2015-12, Vol.38 (7), p.1851-1858
Main Authors: KHAN, TAJ MUHAMMAD, BIBI, TAYYABA, HUSSAIN, BABAR
Format: Article
Language:English
Subjects:
Biomedical materials
Chemistry and Materials Science
Crystal defects
Crystal structure
Crystallites
Emission spectra
Engineering
Fourier transforms
Heat treating
Heat treatment
High temperature effects
Infrared spectroscopy
Lasers
Lattice vacancies
Materials Science
Morphology
Nitrates
Optical properties
Optoelectronics
Oxygen
Phonons
Photoluminescence
Physical properties
Radiation
Raman spectroscopy
Spectrum analysis
Temperature
Ultraviolet emission
Zinc oxide
Zinc oxides
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Summary:UV emitting ZnO nanopowder was chemically synthesized and subsequently subjected to heat treatment in oxygen atmosphere for potential optoelectronic properties. Characterization including Raman spectroscopy, photoluminescence, SEM, FT-IR and XRD were performed to see the effect of high temperature heat treatment and subsequently oxygen defects on the physical properties of ZnO powder. Chemically prepared product was highly pure polycrystalline w-ZnO with random crystallites orientation. Study showed a magnificent absorption of oxygen by the product as manifested by the decreased intensity of deep-level green emission and E 1 (LO) phonon mode. The phonon modes appeared at 276 and 970 cm −1 and which have been assigned to ZnO by the previous researchers under relaxed Raman selection rule were no longer found with heat treatment. UV emission was enhanced and the ratio of UV to green emission ( I UV /I green ) was correlated with the crystal structure and oxygen vacancies before and after heat treatment. FT-IR study established strong Zn-O bending and stretching bands at 356 and 498 cm −1 . SEM analysis demonstrated fine crystallites distribution in ZnO nanopowder with almost spherical morphologies. Reasonably, a more spherical and ordered morphologies with large grains were found with heat treatment. The investigated findings manifested improved structural and optical properties for various optoelectronic and biomedical applications of technological importance.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-015-1103-9