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

Content Provider	Semantic Scholar
Author	Yousefi, Ramin Jamali-Sheini, Farid Cheraghizade, Mohsen Khosravi-Gandomani, Sara Sáaedi, Abdolhossein Huang, Nay Ming Basirun, Wan Jefrey Azarang, Majid
Copyright Year	2015
Abstract	Strontium-doped zinc oxide nanoparticles (Zn1 xSrxO NPs; x1⁄40, 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. & 2015 Elsevier Ltd. All rights reserved.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://umexpert.um.edu.my/file/publication/00004063_122836.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article