XRD, XPS, optical, and Raman investigations of structural changes of nanoCo-doped ZnO
Heiba, zein Elabidin; Arda, L.;
Abstract
The mixed oxides Zn1-xCoxO (ZCO) (0.0 ≤ x ≤ 3.0) were prepared as nanopolycrystalline powders and thin films by a simple sol-gel process and dip coating method. Structural and microstructural analysis was carried out applying X-ray diffraction (XRD) and Rietveld method. Analysis showed that for x < 0.12, Co2+ replaces Zn2+ substitutionally yielding ZCO single phase, while for x ≥ 0.15 two phases are identified; ZCO and Co3O4. Replacing Zn+2 by Co+2 affects the lattice parameters in opposite ways, the parameter c decreases while a increases with an overall decrease in the ratio c/a of the wurtzite ZCO, which deviates the lattice gradually from the hexagonal structure as Co+2 increases. The IR analysis shows red shift entirely dependent on Co concentration. With increased concentration of cobalt the E2high Raman mode exhibits a redshift attributed to the phonon softening caused by the ab-plane lattice expansion, while the E2low mode shows a blueshift due to the reduced mass effect caused by cation replacement. © 2012 Elsevier B.V. All rights reserved.
Other data
Title | XRD, XPS, optical, and Raman investigations of structural changes of nanoCo-doped ZnO | Authors | Heiba, zein Elabidin ; Arda, L. | Keywords | Crystal structure;Sol-gel chemistry;X-ray diffraction;ZnCoO nanomaterial | Issue Date | 29-Aug-2012 | Journal | Journal of Molecular Structure | Volume | 1022 | Start page | 167 | End page | 171 | ISSN | 00222860 | DOI | 10.1016/j.molstruc.2012.04.091 | Scopus ID | 2-s2.0-84864249992 |
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