Synthesis, characterization and spectroscopic investigations of novel nano multi-metal oxide Co3O4·CeO2·ZnO

Md Abdus Subhan; Tanzir Ahmed

doi:10.1016/j.saa.2014.03.051

Synthesis, characterization and spectroscopic investigations of novel nano multi-metal oxide Co3O4·CeO2·ZnO

Spectrochim Acta A Mol Biomol Spectrosc. 2014 Aug 14:129:377-81. doi: 10.1016/j.saa.2014.03.051. Epub 2014 Apr 3.

Authors

Md Abdus Subhan¹, Tanzir Ahmed²

Affiliations

¹ Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh. Electronic address: subhan-che@sust.edu.
² Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.

PMID: 24747863
DOI: 10.1016/j.saa.2014.03.051

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.

Keywords: Co-precipitation; Green emission; NBE emission; Nanocomposite; PL spectra.

MeSH terms

Cerium / chemistry*
Chemical Precipitation
Cobalt / chemistry*
Nanostructures / chemistry*
Nanostructures / ultrastructure
Oxides / chemistry*
Spectrum Analysis
Zinc Oxide / chemistry*

Substances

Oxides
Cerium
Cobalt
ceric oxide
Zinc Oxide
cobalt oxide