F-KCW-Department Publications

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Author: search.filters.author.Balavijayalakshmi JSubject: search.filters.subject.XRD

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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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    EFFECT OF CALCINATION ON STRUCTURAL AND OPTICAL PROPERTIES OF YTTRIUM OXIDE NANOPARTICLES
    (Bharathiar University, 2020-03-05) Uma B; Balavijayalakshmi J; Shanmugapriya T
    Yttrium oxide has a good electron conducting capacity and easy to mold into different shapes. A novel Yttrium oxide(Y2O3) nanoparticles are synthesized by simple chemical precipitation method. The prepared nanocomposites are characterized by X-Ray diffraction (XRD), Field emission Scanning electron microscopy (FESEM), High Resolution Transmission Electron Microscopy(HRTEM), Energy-dispersive X-ray spectroscopy(EDAX), Fourier-transform infrared spectroscopy (FT-IR), Raman Scattering Spectroscopy and UV-visible (UV-vis) absorption spectroscopy.The X-Ray diffraction analysis showed that the crystallite size of the prepared nanocomposites is found to be 22 nm. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry(CV) technique. The synthesized nanoparticles can be applied for solar cell applications, electrochemical investigation and supercapacitor applications.
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    SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES SYNTHESIZED BY ALMOND EXTRACTS
    (Bharathiar University, 2020-03-05) Shalini B; Balavijayalakshmi J; Shanmugapriya T
    A novel green source is opted to synthesize silver nanoparticles using almond peel extract. Almond is rich in bio reduction and the silver nanoparticles are prepared by chemical precipitation method. The synthesized silver nanoparticles (AgNP) are characterized by UV-Visible Spectroscopy (UV –Vis), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction(XRD), Field emission scanning electron microscopy (FESEM) and Energy Dispersive X-ray (EDX). The observed peaks in XRD pattern corresponds to (111). (200), (220) and (311) planes, which confirms the formation of AgNPs. FT-IR measurement is carried out to identify possible biomolecules responsible for efficient stabilization of silver nanoparticles. The synthesized silver nanoparticles have antibacterial property that shows the effective inhibitory activity against water borne pathogens.
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    PREPARATION AND CHARACTERIZATION OF CARBON DOTS BY HYDROTHERMAL METHOD
    (Bharathiar University, 2020-03-05) Preethi M; Balavijayalakshmi J; Shanmugapriya T
    A simple, rapid and cost-effective approach is developed to synthesize fluorescent carbon dots (CDs) using the leaves of Moringa Oleifera as a carbon source for the first time by Hydrothermal treatment. Moringa Oleifera leaves are rich in iron, protein, magnesium, riboflavin, vitamins such as A, B6, and C. The chemical composition and morphological feature of the prepared CDs are characterized by using various spectroscopic methods such as UV-Visible Spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) andEnergy Dispersive X-ray (EDX). The observed peak in XRD pattern corresponds to (002) plane. FT-IR spectroscopy analysis confirms the presence of functional groups with respective binding energies (hydroxyl and carboxyl groups) on the surface of CDs. The prepared CDs are amorphous in nature. These CDs have received special attention due to their distinct characteristics that are advantageous for optical sensing of metal ions and bioimaging applications.
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    STRUCTURAL AND MORPHOLOGICAL ANALYSIS OF POLYMER FUNCTIONALIZED GRAPHENE OXIDE – METAL OXIDE NANOCOPOSITES
    (Sri Ramakrishna Engineering College, Coimbatore., 2018-07-18) Reeshma P; Balavijayalakshmi J
    Graphene is a two dimensional honeycomb arrangement of carbon atom that revolutionize our world in the field of technology. Graphene and its derivatives, such as graphene oxide (GO) and reduced graphene oxide (rGO), are ideal platforms for constructing graphene-based nanostructures for various applications. A new type of graphene oxide /chitosan /MnO2 Nanocomposites are prepared. In this present work, graphene oxide is prepared from natural graphite flakes by modified hummers method, then graphene oxide /chitosan/MnO2 Nanocomposites is synthesised via. chemical co–precipitation method from the mixture of solution of GO, Chitosan and KMnO4. The structural and morphological properties of the prepared nanocomposites are investigated by X-Ray diffraction analysis and Field emission scanning electron microscopy (FE-SEM). The presence of functional groups in the synthesized nanocomposites are studied by Fourier transform infrared spectroscopy(FT-IR).Energy dispersive X-Ray Analysis (EDAX) is used to identify elemental composition of materials. The prepared nanocomposites may be employed for removal of heavy metal ions from waste water.
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    PREPARATION AND CHARACTERIZATION OF NITROGEN DOPED GRAPHENE OXIDE / NICKEL OXIDE HYBRIDS
    (Sri Ramakrishna Engineering College, Coimbatore, 2018-07-18) Shanmugapriya T; Balavijayalakshmi J
    Graphene oxide is one of the most promising material for implementation in the next generation electronic devices because of its unique properties.A new series of Nitrogen doped graphene oxide /Nickel oxide nanocomposites are prepared. Graphene oxide is prepared from natural graphite flakes by modified hummersmethod.Nitrogen doped graphene oxide are synthesised by one step hydrothermal process.Nitrogen doped graphene oxide /Nickel oxidenano composites are prepared by chemical precipitation method.The structure of the prepared nanocomposites are investigated by X-Ray diffraction analysis and morphological properties of the prepared nanocomposites are investigated by Field emission scanning electron microscopy (FE-SEM). The presence of functional groups in the synthesized nanocomposites are studied by Fourier transform infrared spectroscopy(FT-IR).The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry(CV). The prepared nanocomposites may be applied forsensing,dye sensitized solar cell and supercapacitor applications.
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    INFLUENCE OF AG DOPING ON STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF ZINC OXIDE NANOPARTICLES
    (PSGR Krishnammal College for Women, Coimbatore, 2016-01-07) Devaki M; Balavijayalakshmi J
    A wide range of investigations have been focused on transition metals doped II-VI compound semiconductor ZnO, because of its direct band gap of 3.37 eV at room temperature. It has attracted intensive research effort for its unique properties and versatile applications in transparent electronics, ultraviolet (UV) light emitters, piezoelectric devices, chemical sensors and spintronics. Nano zinc oxide is non-toxic and has also been identified as a promising semiconductor material for exhibiting ferromagnetism at room temperature when doped with the transition metal elements. Transition metal doped nanostructure is an effective method to adjust the energy level surface states of ZnO. This can further be improved by varying the doping concentrations of doped materials and thereby changing its physical, especially optical properties. An attempt is made to synthesize Ag doped Zinc oxide nanoparticles by chemical precipitate method. The synthesized nanoparticles are analyzed using FT-IR, UV, XRD and SEM. These nanoparticles may be used in various optoelectronic device applications like solar cells and sensors.
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    PREPARATION AND CHARACTERIZATION OF NITROGEN DOPED GRAPHENE OXIDE / NICKEL OXIDE NANOCOMPOSITES FOR DYE SENSITIZED SOLAR CELL APPLICATIONS
    (PSGR Krishnammal College for women / Advances in applied Research, 2019) Shanmugapriya T; Balavijayalakshmi J
    Solar energy has become a vital type of renewable energy because of its environmental friendliness and the potential for high power conversion efficiency in solar energy harvesting devices. Dye-sensitized solar cells (DSSCs) have gained considerable interest as alternatives to the semiconductor-based thin film solar cells. Natural dye sensitized solar cells have become promising candidates for the replacement of synthetic dyes. Graphene oxide exhibited impressive photoelectric properties, large surface area, high charge-carrier mobility, high conductance and fast electron transfer. Thus graphene oxide was considered as the most promising material for various potential applications. Nickel oxides have been of particular interest because of its good electro-catalytic properties, low toxicity and low cost, which made them suitable for photo-anode in dye sensitized solar cells. In the present work, a hybrid material consisting of nickel oxide nanoparticles anchored onto the nitrogen doped graphene oxide sheets was prepared by chemical precipitation method. The structural and morphological studies of the prepared nanocomposites were investigated by X-Ray diffraction analysis and electron microscopy (FE-SEM). The presence of functional groups in the synthesized nanocomposites was studied by Fourier transform infrared spectroscopy (FT-IR). The electrochemical activity of the prepared nanocomposites was investigated by cyclic voltammetry (CV). The prepared nanocomposites were suitable for dye sensitized solar cell applications.
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    IMPACT OF MOLYBDENUM ON STRUCTURAL AND MORPHOLOGICAL PROPERTIES OF MANGANESE FERRITE NANOPARTICLES BY HYDROTHERMAL METHOD
    (Amrita Vishwa Vidyapeetham, Coimbatore, 2019-12-15) Kaveri N; Balavijayalakshmi J
    The study of transition metal ferrites has vast applications from microwave to radio-wave frequencies and is of great importance from both fundamental as well as in research aspect. Based on their magnetic properties, transition metal ferrites are found to have low magnetic anisotropies and are magnetically categorized as soft. Manganese ferrites are a group of soft spinel ferrite materials with high magnetic permeability, high electrical resistance and low loss. The doping of molybdenum improves its resistivity, strength and toughness. Due to their excellent electrical and magnetic properties, spinel ferrites are technologically important ceramic materials. As transition takes place from micron to nano regime, these materials are found to be with excellent chemical stability, moderate saturation magnetization and low eddy currents especially in spinel ferrites. In this present work, nanocrystalline ferrites of x varies as 0.4, 0.6 and 0.8 are synthesized by hydrothermal method. The prepared nanocrystalline ferrites are characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Energy Dispersive X-Ray Analysis (EDX) and Scanning Electron Microscopy (SEM) for analyzing its structural, functional groups and morphological structures. XRD analysis reveals that the resultant ferrite nanoparticles are found to have cubic structure. FT-IR spectral analysis shows two main broad metal-oxygen bands and confirms the presence of spinel ferrites. EDX analysis confirms the quantitative presence of elements without impurities. This study aims to fabricate the ferrites with better physical and magnetic properties that are useful in a variety of applications such as magnetic sensors, heavy metal removal and transducers. .