Influence of Film Thickness on Structural and Optical Properties of Sol – Gel Spin Coated TiO2 Thin Film

Abstract

Titanium dioxide thin films have been prepared from the solution of TTIP (Titanium Tetra Isopropoxide), Acetic acid and Ethanol on the glass substrates by sol-gel spin coating technique. In the present work, the TiO 2 thin films have been analyzed for different coating cycles which were annealed at 450° C for one hour. The annealed films were characterized by X-Ray diffraction (XRD) method, UV-Visible & Photoluminescence (PL) spectroscopy, Field Effect Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray Analysis (EDAX).The XRD results show that the crystallite size increases from 6.3 nm to 35.5 nm with increase in number of coating cycles. The transmittance of the film and the optical band gap are found to decrease with increase in number of coating cycles. The room temperature PL spectra of TiO 2 thin films show blue and green emissions at 485 nm and 530 nm with excitation at 410 nm. The surface morphology shows rough surface with irregular particles. The stoichiometric ratio of the film was confirmed by EDAX analysis. The results of structural and optical characteristic study suggest that the sol-gel spin coated nanocrystalline TiO 2 thin films can have high potential application in photo catalytic activities.

Estudio de la actividad antimicrobiana de películas delgadas de dióxido de titanio modificado con plata

“…Muchos semiconductores sometidos a radiación UV y UVvis se han utilizado para la degradación de compuestos orgánicos e inorgánicos contaminantes y la inactivación de bacterias y virus en diferentes tipos de ambientes (Dizaj, et al, 2014). Uno de los semiconductores más estudiados es el dióxido de titanio (TiO 2 ), material inocuo que presenta una elevada resistencia a la fotocorrosión, es estable en soluciones acuosas, no es costoso, abunda en la naturaleza y posee una buena actividad fotocatalítica bajo irradiación ultravioleta (Malliga, et al, 2014).…”

Highly oriented and physical properties of sprayed anatase Sn-doped TiO2 thin films with an enhanced antibacterial activity

“…The crystallite size (D) is calculated from Scherer's formula (Malliga et al 2014). From Table 1, the crystallite sizes decrease with increase in Sn content which is attributed to the stress produced by the ionic difference of Sn 4?…”

“…Various TCO materials are ZnO, CdO, SnO, SnO 2 and TiO 2 . Among these materials, TiO 2 plays a most promising role in several areas of research because of its high efficient photocatalytic activity, high refractive index, resistance to photo corrosion, chemical stability, low cost and non-toxicity (Malliga et al 2014). Performance of TiO 2 thin films as a photocatalyst for solar cells or gas sensor depends not only on its energy band structure but also on its crystal structure, crystallite size and morphology (Mechiakh et al 2011).…”

Effect of Sn doping on the structural, optical and electrical properties of TiO2 films prepared by spray pyrolysis

“…With this incorporation of Sn atoms, the growth of crystals is forced to be hindered [15]. The strain (e) and dislocation density (d) are determined by using following relations [18] …”

“…At the higher concentration, the anatase peak became weak, which may be due to excess of Sn into TiO 2 which may lead to the phase transformation such as SnO 2 , rutile phase [17]. The crystallite size D is calculated using Scherrers formula [18].…”