Microstructure, electronic structure and optical properties of combustion synthesized Co doped ZnO nanoparticles
作者： N. Srinatha , K.G.M. Nair , Basavaraj Angadi
DOI: 10.1016/J.PHYSB.2015.06.009
关键词:
摘要: Abstract We report on the microstructure, electronic structure and optical properties of nanocrystalline Zn1−xCoxO (x=0, 0.01, 0.03, 0.05 0.07) particles prepared by solution combustion technique using L -Valine as fuel. The detailed structural micro-structural studies were carried out XRD, HRTEM TEM-SAED respectively, which confirms formation single phased, nano-sized particles. was determined through NEXAFS atomic multiplet calculations/simulations performed for various symmetries valence states ‘Co’ to determine valance state, symmetry crystal field splitting. correlations between experimental spectra simulations, that, present is in 2+ state substituted at ‘Zn’ site tetrahedral with splitting, 10Dq =−0.6 eV. induced defect as-synthesized materials examined diffuse reflectance Photoluminescence spectroscopy, respectively. Red-shift band gap energy (Eg) observed samples due Co (0.58 A) substitution Zn (0.60 A) host ZnO. Also, PL spectra, a prominent pre-edge peak corresponds ultraviolet (UV) emission around 360–370 nm concentration along near edge (NBE) wide ZnO all show blue region.
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