Effect of deposition parameters on the properties of TiO2 thin films prepared by spray pyrolysis
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Titanium dioxide (TiO2) thin films had been deposited onto glass substrates at various substrate temperatures by spray pyrolysis technique. X-ray diffraction analysis of deposited TiO2 films exhibited nanocrystalline nature and preferentially oriented along (101) direction. Scanning electron microscopy depicted that the films were uniform and adherent to the glass substrate. The field emission scanning electron microscopy (FE-SEM) films, exhibiting almost spherical shape of nanosized particles, was observed. The size of particles of 9.2 nm was observed from high-resolution transmission electron microscopy analysis. The decreased surface roughness observed in atomic force microscopy was due to the decrease in grain size with increased substrate temperatures. All films exhibited a transmittance of about 80 % in the visible region. The direct band gap values were from 2.1 to 3.6 eV by increasing substrate temperature. The photoluminescence spectra measurements indicated that the intensity of emission peaks significantly varies with substrate temperature. Further, these TiO2 films showed effective antibacterial activity against tested pathogens. Photocatalytic activity of the TiO2 thin film was studied using an organic dye, methylene blue, under solar irradiation.
KeywordsTiO2 thin films Spray pyrolysis FE-SEM HRTEM Optical properties Antibacterial activity and photocatalytic activity
The authors thank the UGC Minor Project, New Delhi, India, for the financial support through research Grant no. 41-1398/2012(SR).
- 5.Mielke Randall E, Priester John H, Werlin Rebecca A, Gelb Jeff, Horst Allison M, Orias Eduardo, Holdena Patricia A (2013) Differential growth of and nanoscale TiO2 accumulation in Tetrahymena thermophila by direct feeding versus trophic transfer from Pseudomonas aeruginosa. Appl Environ Microbiol 79:5616–5624CrossRefGoogle Scholar
- 12.Bauer AW, Kirby WMM, Sherris JC, Turek M (1996) Antibiotic susceptibility testing by a standardized single disk method. Am J Clin Phothol 45:493–496Google Scholar
- 14.Agashe C, Takwale MG, Bhide VG, Mahamuni S, Kulkarni SK (1999) Effect of Sn incorporation on the growth mechanism of sprayed SnO2 films. J Appl Phys 70:7283Google Scholar
- 16.Malliga P, Pandiarajan J, Prithivikumaran N, Neyvasagam K (2014) Influence of film thickness on structural and optical properties of sol–gel spin coated TiO2 thin film. J Appl Phys 6:22–28Google Scholar
- 20.Sabihdl-Obaidi Saramas, Yousif Ali Ahmed (2013) Synthesis of nanostructure TiO2 thin films by pulsed laser deposition (PLD) and the effect of annealing temperature on structural and morphological properties. J Pure Appl Sci 26:3Google Scholar
- 21.Anil Kumar G, Ramana Reddy MV, Reddy Katta Narasimha (2013) Structural, optical and electrical characteristics of nanostructured ZnO thin films with various thickness deposited by RF magnetron sputtering. Struct Res J Phys Sci 1:17–23Google Scholar
- 33.Farag M, Cavas M, Yakuphanoglu F, Amanullah FM (2011) Photoluminescence and optical properties of nanostructure Ni doped ZnO thin films prepared by sol–gel spin coating technique. J Alloys Compd 509:900–7908Google Scholar
- 35.Nehru LC, Umadevi M, Sanjeeviraja C (2012) Studies on structural, optical and electrical properties of ZnO thin films prepared by spray pyrolysis method. Int J Mat Eng 2:12–17Google Scholar
- 38.Suwanboon Sumetha (2008) The properties of nanostructured ZnO Thin film via sol–gel coating. Naresoan Univ J 16:173–180Google Scholar