F-KCW-Department Publications

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    MICROWAVE ASSISTED SYNTHESIS OF MOS2/PANI/ZNO NANOCOMPOSITES AS A WORKING ELECTRODE FOR ENERGY STORAGE APPLICATIONS
    (Asian Journal of Chemistry, 2021) Balavijayalakshmi J; Krithika S
    Transition metal dichalcogenide and polyaniline doped zinc oxide nanocomposites influence the transition probabilities and electronic structure. In present study, the various concentrations of MoS2/PANI/ZnO nanocomposites are synthesized by microwave assisted method. These nanocomposites are characterized by using XRD, FESEM, HRTEM and FT-IR. The XRD results revealed an average crystallite size of synthesized nanocomposites, which was found to be 19-24 nm. The electrochemical properties of the nanocomposites are studied through the CV, EIS and GCD for the application of supercapacitor as an active electrode material. The MoS2/PANI/ZnO nanocomposites exhibited a specific capacitance of 577 F g-1 and also retained 90% of its initial specific capacitance even after 5000 cycles. Hence MoS2/PANI/ZnO nanocomposites have potential application for energy storage applications.
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    EFFICIENCY STUDIES OF GALINSOGA PARVIFLORA PIGMENTS AS A SENSITIZER IN PT FREE GRAPHENE OXIDE/NICKEL OXIDE COUNTER ELECTRODE: DYE SENSITIZED SOLAR CELL APPLICATIONS
    (SpringerLink, 2021) Shanmugapriya T; Balavijayalakshmi J
    An easily available Galinsoga Parviflora (GP) natural dye has been used as natural sensitizers for dye sensitized solar cell (DSSC). Graphene oxide (GO) is one of the most efficient materials for solar cells, supercapacitor and sensing applications because of its unique properties. It is prepared from natural graphite flakes by modified Hummer’s method. Graphene oxide/nickel oxide (GO/NiO) nanocomposites are prepared by chemical precipitation method. The different concentrations of nickel oxide nanoparticles (5:1, 5:2 and 5:3) are embellished on the GO surface. The synthesis of these nanocomposites are confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM). The XRD results confirmed that the nickel oxide nanoparticles are coated on the graphene oxide surface and the crystallite size of GO/NiO (5:1, 5:2 and 5:3) nanocomposites are found to be around 19 nm, 21.3 nm and 23 nm respectively. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV) technique. The power conversion efficiency is measured using a light source simulated with an intensity of 100 mW/cm2. The conversion efficiency of prepared sandwich type dye sensitized solar cell (5:1, 5:2 and 5:3) is 0.9%, 1.3% and 1.65% respectively.
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    INFLUENCE OF MANGANESE DIOXIDE NANOPARTICLES ON MOS2/PANI NANOSHEETS AND ITS ENERGY STORAGE APPLICATIONS
    (Springer Link, 2023-04-01) Krithika S; Balavijayalakshmi J
    A novel microwave assisted method is adopted to synthesize MoS2/PANI/MnO2(M/P/M) nanocomposites using various concentration (M/P/M-1, M/P/M-2, M/P/M-3, M/P/M-4 and M/P/M-5) of manganese sulphate monohydrate for the design of supercapacitors. The homogeneity, functional groups and phase purity present in the synthesized M/P/M nanocomposites are determined by X-ray diffraction pattern (XRD), Field Emission Scanning Electron Microscope (FESEM), High Resolution Transmission Electron Microscope (HR-TEM) Fourier Transform Infrared Spectroscopy (FT-IR), Selected Area Electron Diffraction (SAED) analysis. XRD results revealed that the crystallite size of the M/P/M nanocompositesas 19–21 nm.HR-TEM images exhibited that the synthesized MoS2/PANI/MnO2 nanocomposites are nanosheet stacked with the spherical shaped particles. The electrochemical behaviour of the M/P/M nanocomposites are studied in aqueous-based electrolytes to determine its superior performances. M/P/M -2 revealed a maximum specific capacitance of 619 F/g in 3 M KOH at 0.5 mA cm− 2 and retained 93.84% of its initial specific capacitance even after 5000 cycles. As a result, M/P/M nanocomposites represent an exciting potential for high-performance electrochemical energy storage devices.
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    INVESTIGATION OF STRUCTURAL, MORPHOLOGICAL AND ELECTROCHEMICAL PROPERTIES OF MOS2/PANI/SNO2 NANOCOMPOSITES FOR ENERGY STORAGE APPLICATIONS
    (Elsevier, 2023-02) Krithika S; Balavijayalakshmi J
    A novel approach has been used in the present work to synthesize the ternary nanocomposites with high specific capacitance by decorating tin(IV)oxide nanoparticles on the surface of MoS2/PANI (MP) nanosheets using microwave assisted method. The performance of the electrode material is analysed by varying the molarity of SnO2 in a range of 0.02 M to 0.1 M with 0.02 M increment. The structural, morphological, functional and chemical composition of the synthesized ternary nanocomposites are characterized. The X-ray Diffraction pattern (XRD) revealed that the formation of tetragonal rutile phase of tin(IV)oxide. Field Emission scanning Electron microscopy (FESEM) analysis exhibited that the nanosphere tin(IV)oxide nanoparticles are adorned on the MP nanosheets. The electrodes made with MoS2/PANI/SnO2 ternary nanocomposites exhibited good specific capacitance and cyclic stability as compared with the MPnanosheets. Hence in the present study MoS2/PANI/SnO2 (MPS) ternary nanocomposites shows thehighest 799.5Ag−1 specific capacitance at current density of 0.5 Ag−1. This also exhibits good cyclic retention of 96.63 %over 5000 charging discharging cycles.
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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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    SYNTHESIS AND FABRICATION OF NANOSTRUCTURED MOS2/PANI NANOCOMPOSITES BY MICROWAVE ASSISTED METHOD FOR ELECTROCHEMICAL APPLICATIONS
    (Elsevier, 2022-01-01) Krithika S; Balavijayalakshmi J
    Transition metal dichalcogenides (TMDCs) are two dimensional nanomaterials made up of a monolayer of transition metal atoms sandwiched (X-M-X) between two layers of chalcogen atoms in a hexagonal lattice. Molybdenum di sulfide (MoS2) have attracted much attention among the TMDCs family and is a suitable electrode material for supercapacitors. It has remarkable physical and chemical properties such as large surface area, sheet like structure, superior capability and lower rates of cyclic induced degradation. However, MoS2 suffers from lower electronic conductivity that limits its energy storage. Hence the conducting polymer, polyaniline is doped with the MoS2 to overcome the deficiencies and to enhance the electrochemical performance. A novel microwave assisted method is implemented to synthesize MoS2/PANI nanocomposites for the strategy of supercapacitors. The microwave assisted processing of MoS2/PANI nanocomposites provides several advantages than the conventional heating method such as tuning the physiochemical properties as reduction of impurity, mono dispersivity in the morphology that results in enhancing the electrochemical performance. The phase purity, homogeneity, and functional groups present in the MoS2/PANI nanocomposites are synthesized and characterized by X-ray diffraction (XRD), Field Emission Scanning Electron microscope (FESEM), High Resolution Transmission Electron Microscope (HR-TEM), Fourier Transform infrared spectroscopy (FT-IR), UV–Visible (UV–Vis) absorption spectroscopy and Raman spectroscopy. The optimized MoS2 /PANI nanosheets exhibits a high specific capacitance of 348 F/g at 0.5 A/g and MoS2/PANI nanocomposites retains 89.21% of its initial specific capacitance even after 2000 cycles. Hence the strategy of microwave assisted synthesis of MoS2/PANI nanocomposites improve the electrochemical performance of two dimensional MoS2 based electrode materials for energy storage.
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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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    SYNTHESIS AND CHARACTERIZATION OF PURE AND AL DOPED CU2S NANOPARTICLES
    (Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 2016-12-16) Yamuna K; Meena P; Balavijayalakshmi J
    Structural and Optical properties of undoped and Al doped Cu2S nanoparticles prepared by Hydrothermal method are studied. The nanoparticles of the obtained pure and Al doped(1%, 3%, 5%, 7% and 9% of Al concentration) Cu2S have been characterized by the XRD, SEM-EDOX and FTIR techniques. The XRD analysis reveals that all the obtained samples exhibit polycrystalline nature. Increasing the degree of crystallinity improves the physical properties of the nanoparticles. The photovoltaic studies show that the obtained nanoparticles have high photocurrent density.
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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.