title: Synthesis, characterization and spectroscopic investigations of novel nano multi-metal oxide Co3O4·CeO2·ZnO.
abstract: A novel multi-metal nanocomposite, Co3O4·CeO2·ZnO has been prepared by co-precipitation of their carbonates from aqueous solutions of the metal nitrates following calcining and annealing 5h at 450°C and 10h at 950°C. Co3O4·CeO2·ZnO has been characterized by XRD, SEM, EDS, IR and PL spectra. The crystallite size of the as-synthesized sample varies in the range of 9-33nm and those of the annealed sample in the range of 19-42nm. Emissions of Co3O4·CeO2·ZnO were observed in UV and visible region at different excitations. Excitation wavelength dependent PL behavior of Co3O4·CeO2·ZnO has been observed in acetone. This PL property is contrary to the well-known Kasha's rule of excitation wavelength dependence of emission spectrum.
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh. Electronic address: subhan-che@sust.edu.
authors.forename: Md Abdus
authors.initials: MA
authors.lastname: Subhan
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: Tanzir
authors.initials: T
authors.lastname: Ahmed
mesh_terms: D002563:Cerium / Q000737:chemistry*; D011232:Chemical Precipitation; D003035:Cobalt / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D013057:Spectrum Analysis; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D010087:Oxides; D002563:Cerium; D003035:Cobalt; C030583:ceric oxide; D015034:Zinc Oxide; C060728:cobalt oxide
keywords: Co-precipitation; Green emission; NBE emission; Nanocomposite; PL spectra