We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Na to tailor the band gap and morphology of ZnO nanograins.
- Authors
Krithiga, R.; Sankar, S.; Subhashree, G.
- Abstract
Sodium doped and undoped zinc oxide compounds are synthesized using sol-gel auto combustion method. The doping has five different concentrations of sodium in zinc oxide. They are characterized for phase and crystal structure using X-ray diffractrometer. It is confirmed that the doping of the impurity atoms show lattice changes. The average particle size of samples are found to be in the range between 32 and 62 nm. Williamson-Hall plots show strain induced in crystallites. Scanning electron microscope micrographs show the morphology of the Na doped samples as nano pebbles, nano platelets and nano rods having considerable width and length; while small thickness. Fourier transform infra-red spectrophotometer and FT Raman studies show the persistent peaks corresponding to characteristic Zn-O bonds. Ultraviolet-visible-near infra-red spectrophotometer studies reveal the decrease in absorbance and red shift in band gap with increasing Na content. The fluorescence spectral analysis of the samples demystifies the existence of oxygen deficient sites. The varying of oxygen vacancy helps band gap tailoring while enhancing Na doping in ZnO.
- Subjects
ZINC oxide; SODIUM; ENERGY bands; CRYSTAL morphology; DOPED semiconductors; SOL-gel processes; COMBUSTION; CRYSTAL structure
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 1, p103
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1556-9