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    GREEN SYNTHESIS OF SILVER NANOPARTICLES (AG NPS) USING GOMPHRENA GLOBOSA (GLOBE AMARANTH) LEAF EXTRACT, CHARACTERIZATION, AND ANTIBACTERIAL ACTIVITY
    (Amrita Vishwa Vidyapeetham, Coimbatore, 2019-12-15) Tamilarasi P; Meena P
    Among the various methods explored for the synthesis of silver nanoparticles (Ag NPs), the green synthesis method has received great attention as a cost effective and environmental friendly method as it avoids toxicity. In the present work, silver nanoparticles were synthesized using silver nitrate as the precursor and an aqueous extract of fresh leaves of Gomphrena globosa (Globe amaranth) as the reducing and stabilizing agent. The active phytochemicals present in the leaves cause quick reduction of silver ions (Ag+) to metallic silver nanoparticles (Ag0). The formation of Ag nanoparticles was initially confirmed by visual observation through the color change of the mixture. The silver nanoparticles obtained were characterized using UV-visible absorption spectroscopy, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDAX), High-resolution transmission electron microscopy (HR-TEM), and Selected area electron diffraction (SAED) analysis. The synthesized silver nanoparticles show excellent antibacterial activity against three gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis, Micrococcusluteus) and three gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae).
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    IMPACT OF ALUMINIUM ON STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF COPPER OXIDE NANOPARTICLES
    (Royal Book publishers / PSGR Krishnammal College for Women, Coimbatore., 2018-01-03) Vidhya Priya P; Balavijayalakshmi J
    Metal-oxide-semiconductors have been widely used for the optoelectronic applications like smart windows, solar cells, light emitting diodes and flat panel displays. Among all the metal oxides, copper oxide nanomaterials have a great attention due to its unique properties. It is mostly used in recent research works because of its low cost, rich availability and used in latent applications like antibacterial activities. Aluminium nanoparticles are a good conductor and it enhances the conductivity. Hence an attempt is made to synthesize CuO and Al doped CuO nanoparticles by hydrothermal method. The prepared samples are characterized by XRD, FT-IR, SEM, UV-Vis and PL analysis.The crystallite structures of CuO and Al doped CuO nanoparticles are identified by XRD analysis. The Fourier transform Infrared spectroscopy is used to determine the functional groups present in the prepared nanoparticles. UV-Vis Spectral analysis is performed to determine the band gap energy of the synthesized nanoparticles. PL spectral studies are used to study the optical properties of the nanoparticles. The morphology of the samples is determined by using scanning electron microscopy analysis. The impact of aluminium on structural, optical and morphological properties is investigated. The antibacterial activities of prepared CuO and Al doped CuO nanoparticles are probed.