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    CHARACTERISATION AND EVALUATION OF ANTIBACTERIAL EFFECT OF SILVER NANOPARTICLES
    (PSG College of Technology, Coimbatore, 2015-08-07) Sharmila C; Chandarshekar B; Ranjith R
    Silver nanoparticles have attracted much attention in recent years. At low concentration these silver nanoparticles are non-toxic in nature and have a broad spectrum of antibacterial actions. Many methods are being investigated for the efficient production of silver nanoparticles among which green synthesis process using plant extract showed more successive rate. Employing plants towards the synthesis of nanoparticles are more advantageous because these plants can act as capping and reducing agent and hence increase the rate of reduction and stabilization of nanoparticles. In this present study silver nanoparticles were synthesized by silver nitrate solution dissolved in distilled water with guava leaves as reducing agent. The biosynthesized nanoparticles were characterized with different characterization techniques. The presence of silver nanoparticles was confirmed by UV-VIS, XRD, FTIR and SEM spectroscopic techniques. Antibacterial activity study was also carried out for the biosynthesized silver nanoparticles.
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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.
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    SYNTHESIS AND CHARACTERIZATION OF CUPRIC CHLORIDE DOPED ZINC SULPHIDE NANOPARTICLES
    (SRM University, Kattankulathur, Chennai, 2015-02-04) Balavijayalakshmi J; Manju S; Lavanya S
    In recent years, the research on semiconductor nanoparticles has stimulated much interest because of their unique optical and electrical properties. The nanosized semiconductor crystallites could produce optical properties which are different from bulk materials. Among the semiconductor nanoparticles, Zinc Sulphide is an important II–VI semiconductor material researched extensively because of its wide range of applications in electroluminescence devices, phosphors, light emitting displays and optical sensors. Semiconductor nanoparticles doped with transition metal ions have attracted much attention because of their luminescent properties. Hence an attempt is made to synthesize cupric chloride doped zinc sulphide nanoparticles. The synthesized nanoparticles are subjected to X-ray diffraction to calculate the average nano-crystalline size using Debye – Scherrer formula. The optical properties of the samples are studied using UV-Vis Spectroscopy. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). FT-IR spectroscopy is used to determine the chemical bonding in the synthesized sample.