Enhanced visible-light photocatalytic activity of strontium-doped zinc oxide nanoparticles

Yousefi, R. and Jamali-Sheini, F. and Cheraghizade, M. and Khosravi-Gandomani, S. and Sáaedi, A. and Huang, N.M. and Basirun, Wan Jefrey and Azarang, M. (2015) Enhanced visible-light photocatalytic activity of strontium-doped zinc oxide nanoparticles. Materials Science in Semiconductor Processing, 32. pp. 152-159. ISSN 1369-8001, DOI https://doi.org/10.1016/j.mssp.2015.01.013.

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Official URL: http://dx.doi.org/10.1016/j.mssp.2015.01.013


Strontium-doped zinc oxide nanoparticles (Zn1-xSrxO NPs; x=0, 0.02, 0.04, and 0.06) were synthesized by a sol-gel method. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images showed NPs with nearly spherical shapes, with sizes from 27 to 41 nm for high Sr concentration and undoped ZnO NPs, respectively. X-ray diffraction (XRD) patterns, selected area electron diffraction (SAED) patterns, and Raman spectra indicated that the undoped and Sr-doped ZnO NPs were crystallized in a hexagonal wurtzite structure. However, the Raman results revealed a decrease in the crystalline quality with an increase in the Sr concentration in the ZnO structure. Evidence of dopant incorporation is demonstrated by X-ray photoelectron spectroscopy (XPS) of the Sr-doped ZnO NPs. From the results of optical characterizations, the band-gap values of the Zn0.98Sr0.02O and Zn0.96Sr0.04O NPs decreased, while the band-gap value of the Zn0.94Sr0.06O NPs increased in comparison to the band-gap value of the undoped ZnO NPs. Finally, the obtained NPs were used as a photocatalyst to remove methylene blue (MB). Observations showed that the efficiency of the photocatalyst activity of the ZnO NPs was significantly increased by increasing the Sr, but until an optimum concentration.

Item Type: Article
Funders: University of Malaya: UMRG Program grant No. RP007C/13AFR and RP005B/13AET
Uncontrolled Keywords: Sol–gel process; Nanocomposites; Sr-doped ZnO NPs; Photocatalyst
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 21 Sep 2018 01:18
Last Modified: 31 Jan 2019 07:31
URI: http://eprints.um.edu.my/id/eprint/19342

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