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LINHUA XU1,2,3,* , FENGLIN XIAN1,2, YULIN CHEN1, JUHONG MIAO1, JING SU1, SHIXIN PEI1, FANG GU1, LIMING QIAN1
- School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
- Optics and Photonic Technology Laboratory, Nanjing University of Information Science & Technology, Nanjing 210044, China
- Jiangsu Research Center for Ocean Survey Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
In this work, Sr-doped ZnO thin films are prepared by sol-gel technique and annealed at various temperatures. The crystal structure of the samples is analyzed by X-ray diffraction (XRD); surface and sectional morphologies are observed by scanning electron microscopy (SEM). The XRD patterns show that all the films crystallize in a wurtzite phase and have a preferential orientation along the c-axis. The SEM morphology images reveal that all the Sr-doped ZnO thin films have a porous structure and the pore size changes with the rise of annealing temperature. When the annealing temperature is 500 ℃, the porosity in the films is highest. The photocatalytic tests of these samples show that all th e porous ZnO thin films exhibit better photocatalytic performance than pure ZnO thin films; and the sample annealed at 500 ℃ exhibits the highest photocatalytic activity, which should be attributed to the higher porosity and stronger light absorption..
Porous ZnO thin films; Annealing temperature; Sol-gel method; Photocatalytic activity.
Submitted at: Nov. 23, 2015
Accepted at: Feb. 10, 2017
LINHUA XU, FENGLIN XIAN, YULIN CHEN, JUHONG MIAO, JING SU, SHIXIN PEI, FANG GU, LIMING QIAN, Tunable nanoporosity in Sr-doped ZnO thin films by thermal annealing treatment and its effect on photocatalytic activity, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 1-2, pp. 96-101 (2017)
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