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Abstrakty
Pure ZnO and Ce-doped (5 at.%) ZnO aerogels were prepared by dissociation of dihydrate zinc acetate and cerium nitrate in methanol, followed by drying in supercritical conditions of the solvent. The concentration of zinc acetate solution and the atomic ratio Ce/Zn were fixed at 0.2 mol/L and 0.05 mol/L, respectively. XRD results showed a hexagonal wurtzite structure of ZnO aerogel crystallites and a formation of a separate second phase of ceria cubic phase with fluorite structure and 7.4 nm in size. The introduction of cerium in the solution had a negative effect on the aerogel crystalline quality. The crystallites size was found to be 16 nm in pure ZnO and 27 nm in Ce-doped ZnO aerogels. The grains of Ce-doped ZnO aerogel had torus shaped morphology with hollow centers, but those of pure ZnO were flattened semispheres. The calculated values of different structural parameters showed that cerium ions introduced into the ZnO lattice occupied interstitial sites and Zn ions substituted Ce ones in ceria lattice during the formation process. FT-IR and UV-Vis absorption spectra have not revealed any particularities due to the presence of cerium atoms in ZnO, indicating that Ce (5 at.%) doping of ZnO crystallites synthesized in supercritical methanol did not strongly affect the optical gap of the semiconductor. Micro-Raman studies confirmed the formation of cubic fluorite structure ceria in ZnO aerogel and showed that Raman active modes of ZnO are amplified with the presence of ceria.
Wydawca
Czasopismo
Rocznik
Tom
Strony
659--664
Opis fizyczny
Bibliogr. 21 poz., rys., tab.
Twórcy
autor
- Laboratoire de Génie de l’Environnement (LGE), Université de Béjaia, Algeria
autor
- Laboratoire de Génie de l’Environnement (LGE), Université de Béjaia, Algeria
autor
- Laboratoire de Génie de l’Environnement (LGE), Université de Béjaia, Algeria
autor
- Laboratoire de Génie de l’Environnement (LGE), Université de Béjaia, Algeria
autor
- Laboratoire de Génie de l’Environnement (LGE), Université de Béjaia, Algeria
Bibliografia
- 1. Zhao M., Wang X., Ning L., Jia J., Li X., Cao L., Sensor. Actuat. B-Phys., 156 (2011), 588.
- 2. Bouderbala M., Hamzaoui S., Adnane M., S AhraouiT., Zerdali M., Thin Solid Films, 517 (5) (2009) 1572.
- 3. Mahmoud W.E., J. Cryst. Growth,312 (2010), 3075.
- 4. Egbuchunam T., Balkose D., Dry Technol., 30 (2012), 739.
- 5. Veriansyah B., Kim J.D., Koun B., Ho M.Y., Youn-Woo S., Kim L.K., J. Supercrit. Fluid., 52, (2010), 76.
- 6. Meddouri M., Djouadi D., Chelouche A., Touam T., Chergui A., Eur. Phys. J.-Appl. Phys., 66 (1) (2014), 10402.
- 7. Djouadi D., Meddouri M., Chelouche A., Opt. Mater., 37 (2014), 567.
- 8. Shi Q., Wang C., Li S., Wang Q., Zhang B., Wang W., Zhang J., Zhu H., Nanoscale Res. Lett.,9 (2014), 9480.
- 9. Chelouche A., Touam T., Djouadi D., Aksas A., Optik, 125 (2014), 5626.
- 10. Panda N.R., Acharya B.S., Singh T.B., Gartia R.K., J. Lumin., 136 (2013), 369.
- 11. Karunakaran C., Gomathisankar P., Manikandan G., Mater. Chem. Phys., 123 (2010), 585.
- 12. FebianaDjaja N., Saleh R., Msa, 4 (2013), 145.
- 13. Barret C.S., Massalski T.B., Structures of Metals: Crystallographic Methods, Principles and Data, Pergamon Press, Oxford, 1980.
- 14. Rem F., Xin R., Ge X., Leng Y., Acta Biomater., 5 (2009), 3141.
- 15. Clinton J.C.,Colloidal Cerium Oxide Nanoparticles: Synthesis and Characterization Techniques, Ph.D Thesis, Virginia Polytechnic Institute, 2008.
- 16. Liddiard A.B., Thermodynamics and kinetics of point defects, in: Hays W. (Ed.), Crystal With Fluorite Structure, Clarendon Press, 1974.
- 17. George A., Sharma S.K., Chawla S., Malik M.M., Qureshi M.S., J. Alloy. Compd., 509 (2011), 5942.
- 18. Kumar S., Sahare P.D., Opt. Commun., 285 (24) (2012), 5210.
- 19. Reddy A.J., Kokila M.K., Nagabhushana H., Rao J.L., Shivakumara C., Nagabhushana B.M., Chakradhar R.P.S., Spectrochim. Acta A, 81, (2011), 53.
- 20. Francisco M.S.P., Mastelaro V.R., Nascente P.A.P., Florentino A.O., J. Phys. Chem. B, 105 (2001), 10515.
- 21. Xu Q.H., Xu D.M., Guan M.Y., Guo Y., Qi Q., Li G.D., Sensor. Actuat. B-Chem., 177 (2013), 1134.
Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-8d9bd207-c89d-4837-9750-26e03648ae31