F-KCW-Department Publications

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    BIOSYNTHETIC GREENER MOVE TOWARDS NANOSIZED SILVER BY DIOSPYROS MONTANA LEAF EXTRACT AND THEIR ANTIMICROBIAL AND ANTIOXIDANT ACTIVITIES
    (Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP), 2020-01-05) Kanchana, P; Arunadevi, N; Hemapriya, V; Shanmuga Sundari, S; Prabha Devi, B
    Synthesis of nanomaterials by eco-friendly method is being exploited by chemists because of several advantages over other conventional techniques. The current investigation reports the green approach for Diospyros Montana(DM) silver nanosized particles which has high antimicrobial and antioxidant activities. The synthesized nanosized particles were investigated by several techniques such as IR, Ultra violet, X-Ray Diffraction, Transmission Electron Microscope and AFM studies. Crystalline size of the silver nanoparticle is in the range of 47.05 nm which was clear from the powder X-rd studies. The silver nanoparticls prepared were tested for their antimicrobial potential against E.coli, B.subtilis, C.albicans and A.flavus species and was found to reveal excellent activity because of its volume ratio and high surface.The DPPH assy was used to find scavenging activity of free radicals. In this work we report the silver nanoparticles by aqueous Diospyros Montana leaf extract and its potential for free radical scavenging.
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    CARICA PAPAYA PEEL MEDIATED SYNTHESIS OF SILVER NANOPARTICLES AND ITS ANTIBACTERIAL ACTIVITY AGAINST HUMAN PATHOGENS
    (Elsevier, 2017-10-01) Balavijayalakshmi J; Ramalakshmi V
    Metallic nanoparticles are traditionally synthesized by wet chemical techniques, in which the chemicals used are quite often toxic and flammable. Ripe carica papaya peel is found to be a suitable source for green synthesis of silver nanoparticles. In the present work, a cost effective and environmental friendly technique for the green synthesis of silver nanoparticles from 1 mM silver nitrate (AgNO3) solution through the extract of ripe Carica papaya peel of various concentrations (5 ml, 10 ml, 15 ml, 20 ml, 25 ml) is described. The synthesized silver nanoparticles are characterized by using the UV–vis absorption spectroscopy, FT-IR, XRD, SEM and TEM. The formation of silver nanoparticles is confirmed by surface plasmon resonance, determined by UV–vis spectra at 400–435 nm. The shift in the absorption bands and variation in the calculated optical band gaps for the various concentrations of papaya peels extracts are also observed. The FT-IR spectra reveal that an increase in the concentration of the papaya peel extract shifts the bands to higher wavelengths. The average crystallite size for various concentrations of papaya peel extract is observed from XRD spectral analysis and is found to be around 16–20 nm, which is in good agreement with the TEM analysis. The SEM analysis shows the spherical structure of the silver nanoparticles with some agglomeration for higher concentrations of papaya peel extract. The synthesized silver nanoparticles show good antibacterial activity against human pathogens such as Escherichia coli and Staphylococcus aureus and it has many medical applications
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    IMPACT OF IRON DOPING ON STRUCTURAL AND OPTICAL PROPERTIES OF NICKEL SULPHIDE NANOPARTICLES
    (Elsevier, 2022-01-01) Balavijayalakshmi J; Sonia D
    Transition metal sulphides exhibit excellent optical, photo electrical and thermoelectric properties. These materials have attracted much attention because of its applications in the field of electroluminescence devices, light emitting displays, cathode material for rechargeable lithium battery, magnetic devices, dye degradation and optical sensors. In the present work, iron doped Nickel sulphide nanoparticles are synthesized using chemical precipitation method. Nickel chloride and Ferric chloride are used as precursors and sodium sulphide as a stabilizing agent. The performance of the synthesized nanoparticles are analysed by varying the molarity of the iron chloride from 0.01 M to 0.05 M. The synthesized nanoparticles are characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Ultraviolet Visible spectroscopy (UV–Vis) and Photoluminescence (PL) studies. FT-IR spectral analysis shows the band at 630 cm−1 corresponds to the bending vibration of metal sulphur bond (Ni-S) and the bands observed around 585 cm−1 and 456 cm−1 are ascribed to Fe–O stretching vibrations of tetrahedral and octahedral lattice sites respectively. The XRD analysis shows the crystalline nature of nanoparticles and the average nano-crystallite size is found to be 18 nm − 26 nm. The crystallite size increases with increase in the concentration of iron. The morphology of the samples is analyzed using scanning electron microscope and is found to be spherical in shape. The optical properties are characterized using UV–Vis spectral analysis and PL study. UV–Visible absorption spectra show absorption peaks of iron doped nickel sulphide nanoparticles and the band exhibits a blue shift, indicates quantum size effect. Electrochemical studies revealed two oxidation peaks at a potential about −0.3 V and 0.7 V for pure nickel sulphide nanoparticles and in addition to it, a redox peak is observed at a potential about −0.5 V due to the doping of iron into the nickel sulphide nanoparticles. The synthesized nanoparticles may be used as high-performance electrode materials for supercapacitor applications.
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    BIOSYNTHETIC GREENER MOVE TOWARDS NANOSIZED SILVER BY DIOSPYROS MONTANA LEAF EXTRACT AND THEIR ANTIMICROBIAL AND ANTIOXIDANT ACTIVITIES
    (Blue Eyes Intelligence Engineering & Sciences Publication, 2020-01-04) Kanchana P; Arunadevi N; Hemapriya V; Shanmuga Sundari S; Prabha Devi B
    Synthesis of nanomaterials by eco-friendly method is being exploited by chemists because of several advantages over other conventional techniques. The current investigation reports the green approach for Diospyros Montana(DM) silver nanosized particles which has high antimicrobial and antioxidant activities. The synthesized nanosized particles were investigated by several techniques such as IR, Ultra violet, X-Ray Diffraction, Transmission Electron Microscope and AFM studies. Crystalline size of the silver nanoparticle is in the range of 47.05 nm which was clear from the powder X-rd studies. The silver nanoparticls prepared were tested for their antimicrobial potential against E.coli, B.subtilis, C.albicans and A.flavus species and was found to reveal excellent activity because of its volume ratio and high surface.The DPPH assy was used to find scavenging activity of free radicals. In this work we report the silver nanoparticles by aqueous Diospyros Montana leaf extract and its potential for free radical scavenging.
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    COMPARISON OF THEORETICAL AND EXPERIMENTAL STUDIES OF 2-OXO-4-PHENYL QUINOLINE
    (Chemical Science Review and Letters, 2016) D, Mageswari; G, Selvi
    2-oxo-4-phenyl-quinoline were synthesized from ethyl benzoyl acetate. The compounds were characterized by IR, 1H NMR, 13C NMR spectra and Single-crystal X-ray diffraction studies. The theoretical studies were predicted by utilizing DFT/B3LYP and HF with 6-31G (d, p) as basis set in Gaussian 09. Natural Bond Orbital (NBO) analysis is also used to explain the molecular stability. NMR chemical shifts are calculated by using GIAO shielding tensors. The experimental results of XRD, IR, 1H NMR and 13C NMR are in very good agreement with the theoretical studies. In addition, molecular electrostatic potential (MEP) and frontier molecular orbital analysis, Fukui and local softness indices were investigated using theoretical calculations. Based on the theoretical and experimental results, the reactions conditions and the reactivity towards the electrophilic & nucleophilic attacks were predicted.
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    PREPARATION AND CHARACTERIZATION POLY (VINYLIDENE FLUORIDE-TRIFLUOROETHYLENE) COPOLYMER THIN FILMS FOR ORGANIC FERROELECTRIC FIELD EFFECT THIN FILM TRANSISTORS
    (Kongunadu Arts and Science College, 2015-06-06) Chandar Shekar B; Sulana Sundari; Sunnitha S; Sharmila C
    Polyvinylidene fluoride (PVDF) and Trifluoroethylene ((TrFE) are potential polymers which are used in acoustic transducers and electromechanical actuators because of their inherent piezoelectric response, as heat sensors because of their inherent pyroelectric response and as dielectric layer in organic thin film transistors. In the present study thin films of copolymer Poly(vinylidene fluoride-trifluoroethylene) were prepared by spin coating method for two different concentrations 2% to 8% and for various spin speeds from 2000 RPM to 5000 RPM. A P-type Si wafer was used as a substrate to deposit P(VDF-TrFE) thin films. 2- butanone was used as a solvent to prepare P(VDF-TrFE) solution. To study the annealing effect, the films were annealed for three different temperatures 50° C, 100° C and 175° C. Ellipsometry was used to measure the thickness of the films. The identification of the films prepared was done by using FTIR spectrophotometer. The structure of the films was studied by using small angle XRD. The morphology of the coated surface was investigated using SEM. It is observed that the thickness of the film coated depends on concentration, spin speed and annealing temperature. The XRD spectrum indicated the amorphous nature with crystallites of very low dimension. SEM micrographs also conforms the predominantly amorphous nature of the film surface. The observed smooth surface with amorphous structure indicated that these films could be used as dielectric layer in organic ferroelectric field effect thin film transistors
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    STUDIES ON SYNTHESIS AND CHARACTERIZATION OF CUSNANOPARTICLES
    (PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) Deepika R; Meena P; Mythili A.R
    Copper sulfide nanoparticles which are promising materials with potential applications in solar energy conversion, catalysis, sensing etc., have attracted the interest of researchers in view of their non-toxic nature. In the present study, CuS nanoparticles have been synthesized by the facile Chemical Route method which has received much attention due to the simple operation, low cost, faster reaction rate, high yield, environmental safety, and low energy consumption. The synthesized nanoparticles have been characterized by X-Ray diffraction (XRD), Scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDAX) and UV-VIS spectrophotometry.
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    PREPARATION AND CHARACTERIZATION OF ENVIRONMENTALLY SAFE TIN SULFIDE(SNS) NANOPARTICLES
    (PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) Deepika R; Meena P; JosephineVincy P
    Nanoparticles of tinsulfide (SnS), are environmentally safe materials which are important as they are employed in optoelectronic devices.The band gap of SnS which is a binary semiconductor compound is about 1.3 eV, which is close to the optimum value required for the efficient sunlight absorption. SnS layers are used to enhance the efficiency of solar cells. In the present study,SnS nanoparticles have been synthesised by chemical route method. Structural, morphological and optical properties have been investigated with the help of X-ray diffraction technique (XRD), scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDAX) and ultra-violet visible (UV) analysis.
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    EFFECT OF SURFACTANT ON STRUCTURAL, MORPHOLOGICAL, OPTICAL AND ELECTRICAL PROPERTIES OF CUO NANOPARTICLES FOR APPLICATION IN P-N JUNCTION DIODE
    (Bannari Amman Institute of Technology, Sathyamangalam, 2017-08-17) Selleswari D; Meena P; Mangalaraj D; Jeevitha G
    Copper oxide nanomaterials have kindled the interest of researchers in view of their potential applications in electronic devices. In the present work, Copper oxide (CuO) nanoparticles were prepared through the simple hydrothermal method using two different concentrations (0.1 and 0.5 M) of the surfactant (CTAB) and their structural, optical, electrical and diode properties have been analyzed. From the XRD analysis, it was observed that the surfactant reduced the crystallite size of the CuO nanoparticles. It also caused an increase in the optical band gap and absorbance. The SEM analysis showed the strong influence of the surfactant on the structure of the nanoparticles. The presence of Cu and O elements was confirmed from the FT-IR spectrum. The study of the electrical properties revealed that the conductivity increased on using CTAB. The electrical parameters such as ideality factor (n), barrier height (ФB) and series resistance (Rs), and interface properties for the p-Si/CuO/Ag diodes have been analyzed by the I-V method.
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    GROWTH AND CHARACTERISATION OF PURE AND GLYCINE DOPED AMMONIUM DIHYDROGEN PHOSPHATE (ADP)
    (GRD Centre for Materials Research,PSG College of Technology Coimbatore, 2016-02-26) Deepika R; Meena P
    Pure and Doped(with Glycine) Ammonium Dihydrogen Phosphate (ADP) crystals were grown by slow evaporation method at room temperature. The grown crystals were subjected to powder X–ray diffraction studies to study their structural characteristics. The addition of amino acid is found to improve the quality of the crystal and yields highly transparent crystals with well-defined features. Fourier transform infrared (FTIR) spectral analysis was performed to identify the presence of various functional groups in the crystals. The UV–Visible–NIR spectral analysis was carried out to confirm the improvement in the transparency of the ADP crystal on the addition of Glycine.