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This paper reports the influence of annealing temperature on crystalline size, film roughness, surface morphology and photoluminescence properties of ZnO thin films prepared by dip and spin coating techniques. Thin films were annealed at 400 C and 500 C for one hour each and their structural properties were studied using XRD, AFM and SEM. The coatings were characterized for photoluminescence using UV-visible Spectrometer. The films produced by both the methods conformed to hexagonal wurtzite structure. The grain size of dip coated films annealed at 400 C and 500 C were 291 and 312 nm and for spin coated films were 140 nm and 172 nm respectively. The surface roughness values of the dip coated films corresponding to the two temperatures were 17.31nm and 23.52 nm and those for spin coated films were 16.74 and 21.43 nm respectively. Annealing temperature significantly influenced crystallinity and surface roughness of the thin films in both methods of coating.

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In this work, we demonstrate the microwave assisted solution combustion synthesis of aliovalent cations substituted Zn0.94M0.06-xLixO (M: Fe3+, Al3+, Cr3+) nanoparticles. The structural features, photoluminscent and photocatalytic properties were characterized...

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ZnO/CuO nanocomposite was synthesized by solution combustion method using three organic fuels - EDTA, Citric Acid and Oxalic Acid with Zinc Nitrate Hexahydrate and Copper Nitrate Trihydrate as precursors. ZnO/CuO nanocomposite was characterised for PXRD, SEM and EDAX to analyse the Structural, Morphological properties and Elemental composition. Crystallite size of 13.82 nm was found for the ZnO/CuO nanocomposites prepared from Oxalic Acid (OA). Further, ZnO/CuO nanocomposites synthesised from three different metal nitrate weight ratios (25:75, 45:55 and 65:35) using OA as fuel and Antibacterial studies was carried out on E.coli by disc diffusion method. PXRD results confirm that the nanocomposites prepared were in nano domain with the average crystallite size was found to be in the range of 13–21 nm. SEM micrographs of ZnO/CuO nanocomposites showed hexagonal ZnO and spherical CuO particles and the particle size was found to be in the range of 30–60 nm. EDAX results confirmed the presence of four elements namely C, O, Cu and Zn. Antibacterial studies showed that the inhibition zone of the nanocomposite was maximum (24 mm for 20 μL) for the sample having high concentration of ZnO nanoparticles and it depends on the crystallite size of the ZnO/CuO nanocomposite.

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