Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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The Sn-doped silver oxide (Ag 2 O) thin film deposited on well-cleaned microscopic glass plates by Jet Nebulizer Technique was reported in this work. The coated thin film was annealed at 200 and 400 °C temperatures, respectively. The XRD investigation on the thin film at three different temperatures have been carried out and their results showed that, the maximum peak intensity of (200) plane was observed at 400 °C than rest of the two samples. In addition to that, it was also found that, the annealing process has certainly improved the crystallization of the film particularly at 400 °C. The SEM and TEM results confirmed that the particle size in the range of 30–50 nm. The peaks corresponding to the Ag and O in EDAX spectrum ensure the film is purely made up of nano-Ag 2 O and the presence of Sn was also confirmed by its respective peak. Additionally, vibrational analysis and Raman spectroscopy was carried out in this work to confirm the modes of vibration of the NPs. Sensitivity analyses was carried out to test the sensing capacity of the powder. © 2017, Shiraz University.

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School of Advanced Sciences

Chennai Campus

Physics

Iranian Journal of Science and Technology, Transaction A: Science

Investigations of Doping of Sn with Ag 2 O as a Thin Film on Glass Plate for Morphological Studies

The ZnO, TiO2, and ZnO-10 wt% of TiO2 and TiO2-10 wt% ZnO nanoparticles are synthesized by solution combustion synthesis at 200 C. The crystal structure of the four samples are analyzed by X-ray diffractometer (XRD). XRD results suggest that the crystal properties of the doped samples improved without any effect on the parent lattice. The morphological and optical properties of the TiO2-doped ZnO sample are characterized by scanning electron microscopy and UV-Vis spectroscopy. The IR and Raman laser observations indicate that the compounds consist of Ti- O and Zn-O bonds, suggesting that the prepared compounds are indeed pure. An upward shift, which is most likely due to the doping material, is observed in the absorption studies. This article discusses the structural, optical, and morphological properties that are changed with the doping concentrations. © 2018 American Scientific Publishers

Journal of Bionanoscience

Comparative Study of ZnO, TiO2, ZnO-Doped TiO2 and TiO2-Doped ZnO Nanocomposites and Their Biological Applications

NiO/CuO/ZnO combined semiconductor metal oxide structures based ternary nanocomposites were synthesized in 2:1:1,1:2:1 and 1:1:2 molar ratios using a simple and combined co-precipitation - hydrothermal method without utilizing any fuels, capping agents or surfactants. The structural, bonding, band gaps and morphological behaviour of the synthesized ternary nanocomposites were investigated using x-ray diffraction, Fourier transform infrared spectroscopy, UV-Diffuse reflectance spectroscopy and atomic force microscopic measurements. The dielectric properties recorded for these combined semiconductor metal oxide structures are valid with Maxwell-Wagner (M-W) model which is based on the dielectric nature in conducting grains layered with poorly conducting grain boundaries. The higher values of dielectric constant were observed for the ternary nanocomposite ratio 1:2:1 and the reduction in the values of dielectric constant of other ternary nanocomposite ratios (1:1:2 and 2:1:1) at lower frequencies is due to the fact the grain boundaries are preferably occupied by more Cu2+ ions than N i 2 + and Zn2+ ions. This kind of attempt in investigating the physical insights of combined semiconductor metal oxide structures is needed for the development of novel semiconducting devices. © 2018IOP Publishing Ltd.

Materials Research Express

Structural, morphological and dielectric investigations on NiO/CuO/ZnO combined semiconductor metal oxide structures based ternary nanocomposites

Nanomaterials of CeO2 with A. vera were synthesized by using simple chemical method. Grapes drops are used as an oxidizing agent. Structural and morphological studies of nanomaterials of cerium oxide (CeO2), were studied for combustion method of preparation. The precursor solution was initialized by a hydrothermal reaction. Cerium hydroxyl carbonate precursors which involves cerium (III) nitrate Ce(NO3)3. 6 H2O with (1.0 M) of seashell powder, 3% A. vera, extracts, grapes and pomegranate drops and this complex solution was used to produce the CeO2 powder particles. We have prepared another sample with 5% of Aloe vera extract and found that 3% Aloe vera extract has lesser grain size and enhanced band gap values, so the article explained the sample analysis of combination with 3% extract of Aloe vera. The product has the rod pattern which was the unusual features appear to originate from the unique crystal chemistry aspects. From the optical absorption spectrum, it has been shown that the CeO2 rods have 3.847 eV of direct band gap energy. The minimum inhibitory concentration (MIC) values of the synthesized compounds exhibited activity towards various microbial pathogens such as B. subtilis (15 μg/mL), S. aureus (50 μg/mL), S. epidermidis (20 μg/mL), E. faecalis (25 μg/mL) and towards E. coli (100 μg/mL), K. pneumoniae (50 μg/mL) and P. aeruginosa (75 μg/mL) respectively. The tests on bacterial activities confirmed that the CeO2 rods are suitable hand for the biological applications. The seashell structure and the phytochemical contents of A. vera might enhance its bacterial activities. © 2017 Elsevier B.V.