Abstract
Nano crystalline titania thin film was prepared by sol–gel dip coating method and its acetaldehyde gas sensing characteristics has been discussed. Sodium carboxymethyl cellulose was used as an additive in order to improve the adhesiveness of titania nanoparticles on a glass substrate. The dip coated film was annealed at 450 °C and characterized by XRD, FE-SEM and TEM. The result of XRD revealed that TiO2 exhibits crystalline anatase phase. Crystallite size of titania was estimated using Scherrer’s formula and it was found to be 31 nm. Spherical morphology of titania nano particles was observed using FE-SEM and TEM. The room temperature gas sensing characteristics of acetaldehyde was studied using chemiresistive method. Gas sensing parameters such as response, selectivity, lowest detection limit towards acetaldehyde were discussed in detail.
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