Abstract. Present work deals with the preparation of TiO2 thin films of different thicknesses by PVD technique using an electron beam and to characterize the films for oxygen gas detection. The films were characterized using optical transmission measurements, XRD and atomic force microscopy. From the spectral data, the extinction, absorption coefficient and refractive index of the films are evaluated and reported. The optical band gap energy varies between 3 and 3.68 eV. The XRD pattern confirms the formation of polycrystalline anatase structure of Titanium with preferred orientation of (110) plane. The AFM images indicate the presence of coarse and fine grains with uniform as well as smooth surfaces over the entire range of the analyzed surface. Response characteristics of TiO 2 thin films for oxygen gas detection are studied, which indicate a low response time of 120 seconds and high sensitivity of 16 at the operating temperature 450 ~
Nanocomposites are novel materials which are yet to be explored and utilised in many applications. Nanocomposites can be tailored by the volume fraction of the matrix, fibre, and also by the size and shape of the nanomaterial in the composite. Preparing nanocomposite with a desired shape and size still remains a challenge. In the present work, SnO-Fe2O3 nanocomposite was prepared using sol gel route with Ferric chloride and Tin chloride as precursors. The prepared nanocomposite was characterised by X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The crystallite size obtained was approximately 60 nm, with a band gap of 3.55 eV. The band gap of the composite could further be tuned with nanosize.
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