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Chandramohan, S.
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- 2024Parafilm Enabled Rapid and Scalable Delamination/Integration of Graphene for High‐Performance Capacitive Touch Sensorcitations
- 2009High-energy heavy-ion induced physical and surface-chemical modifications in polycrystalline cadmium sulfide thin filmscitations
- 2008Influence of porous morphology on optical dispersion properties of template free mesoporous titanium dioxide (TiO2) filmscitations
- 2007Effect of 80 MeV oxygen ion beam irradiation on the properties of CdTe thin filmscitations
- 2007Swift heavy ion beam irradiation induced modifications in structural, morphological and optical properties of CdS thin filmscitations
- 2006Structural properties of CdTe thin films on different substrates
- 2006Structural and photoluminescence properties of swift heavy ion irradiated CdS thin filmscitations
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article
Influence of porous morphology on optical dispersion properties of template free mesoporous titanium dioxide (TiO2) films
Abstract
<p>This paper focuses the influence of porous morphology on the microstructure and optical properties of TiO<sub>2</sub>films prepared by different sol concentration and calcination temperatures. Mesoporous TiO<sub>2</sub>thin films were prepared on the glass substrates by sol-gel dip coating technique using titanium (IV) isopropoxide. Porous morphology of the films can be regulated by chemical kinetics and is studied by scanning electron microscopy. The optical dispersion parameters such as refractive index (n), oscillator energy (E<sub>d</sub>), and particle co-ordination number (N<sub>c</sub>) of the mesoporous TiO<sub>2</sub>films were studied using Swanepoel and Wemple-DiDomenico single oscillator models. The higher precursor concentration (0.06 M), films exhibit high porosity and refractive index, which are modified under calcination treatment. Calcinated films of low metal precursor concentration (0.03 M) possess higher particle co-ordination number (N<sub>c</sub>=5.05) than that of 0.06 M films (N<sub>c</sub>= 4.90) due to calcination at 400 °C. The lattice dielectric constant (E<sub>∞</sub>) of mesoporous TiO<sub>2 </sub>films was determined by using Spintzer model. Urbach energy of the mesoporous films has been estimated for both concentration and the analysis revealed the strong dependence of Urbach energy on porous morphology. The influence of porous morphology on the optical dispersion properties also has been explained briefly in this paper.</p>