Sol concentration effect on ZnO nanofibers photocatalytic activity synthesized by sol-gel dip coating method

被引:16
作者
Toubane, M. [1 ,2 ]
Tala-Ighil, R. [2 ,3 ]
Bensouici, F. [1 ,2 ]
Bououdina, M. [4 ]
Souier, M. [5 ]
Liu, S. [6 ]
Cai, W. [6 ]
Iratni, A. [2 ]
机构
[1] Mhammed Bougara Univ, Dept Phys, Fac Sci, Boumerdes 35000, Algeria
[2] Mhammed Bougara Univ, URMPE Unit, Boumerdes 35000, Algeria
[3] Mhammed Bougara Univ, Inst Elect & Elect Engn, Boumerdes 35000, Algeria
[4] Univ Bahrain, Coll Sci, Dept Phys, POB 32038, Sakheer, Bahrain
[5] Sultan Qaboos Univ, Coll Sci, Dept Phys, POB 36, Muscat, Oman
[6] Chinese Acad Sci, Inst Solid State Phys, Ctr Environm & Energy Nanomat, Anhui Key Lab Nanomat & Nanotechnol,Key Lab Mat P, Hefei 230031, Peoples R China
关键词
dip coating; sol concentration; FESEM; AFM; photocatalysis; ZnO nanofibers; POWER SPECTRAL DENSITY; THIN-FILMS; OPTICAL-PROPERTIES; SPRAY-PYROLYSIS; VISIBLE-LIGHT; PHOTODEGRADATION KINETICS; ANNEALING TEMPERATURE; TITANIUM-DIOXIDE; DEGRADATION; TIO2;
D O I
10.1088/2053-1591/aa61cf
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
ZnO thin films were deposited onto glass substrate by sol-gel dip coating method. The initial sol concentrations were varied from 0.2 to 0.5 M. Zinc acetate dihydrate, ethanol and Diethanolamine (DEA) were used as staring material, solvent and stabilizer respectively. The evolution of structural, optical properties and methylene blue (MB) photodegradation of the as-deposited films on sol concentration was investigated. Rietveld refinements of x-ray patterns reveal that all the as-prepared thin films have a Zincite-type structure with grain orientation along to c-axis. The strongest sol concentration is favorable for the highest crystallization quality. However, the high preferred orientation factor (POF) occurs for 0.3 M sol concentration. The field emission scanning electron microscopy observations reveals nanofibrous morphology with different lengths. The nanofibers density increases with increasing sols concentrations until forming a flower-like morphology. The EDS analysis confirms the high purity of the as-deposited ZnO films. It is found that all films present good transparency greater than 95% in the visible range; the optical band gap is slightly reduced with the increase in sol concentration. The photocatalytic degradation is enhanced by 90% with the sol concentration. The K-app rate reaction increased with increasing sol concentration. The films stability is found to slightly decrease after the third cycle, especially for 0.5 M sol concentration.
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页数:17
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