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Author: search.filters.author.Balavijayalakshmi, JStart date: 1993

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    EFFECTIVE APPROACH TO IMPROVE PHOTOCATALYTIC DYE DEGRADATION ABILITY OF ZNO BASED NANOPOWDER: SIMULTANEOUS CATIONIC AND ANIONIC DOPING, AND ENZYME COUPLING
    (Springer Link, 2024) Vasanthi, D S; Thirumurugan, K; Ravichandran, K; Kavitha, P; Ayyanar, M; Balavijayalakshmi, J; Suvathi, S; Shalini, R
    In this study, vermiwash derived—enzyme enriched ZnO NPs co-doped with copper and nitrogen were synthesized using soft chemical method for cost-effective and eco-friendly photocatalytic dye degradation. Undoped and copper (cationic), nitrogen (anionic) and copper + nitrogen (cationic + anionic) doped ZnO NPs were synthesized separately and compared with their vermiwash derived—enzyme enriched counterparts. Vermiwash—an aqueous liquid obtained from vermi reactor of Eudrilus eugineae earthworm—was used as a reducing agent along with NaOH for the synthesis process. The presence of four enzymes viz. phosphatase, urease, protease and amylase was confirmed through enzymes activity studies. The enzymes quantitative study clearly showed that the enzymes prevalent in the vermiwash are inherited by the vermiwash activated nanoparticles as well as by the photocatalytically treated water. The photocatalytic dye degradation efficiency of the ZnO:Cu:N:vermi nanopowder against the methylene blue dye was found to be 99% which is the best among all the other synthesized counterparts. The photocatalytic dye degradation efficiencies of the enzyme enriched samples were in the order: ZnO:vermi < ZnO:N:vermi < ZnO:Cu:vermi < ZnO:Cu:N:vermi. The same order is observed in the bare samples also: ZnO < ZnO:N < ZnO:Cu < ZnO:Cu:N. The mechanism lying behind the enhanced photocatalytic ability of the vermiwash activated ZnO:Cu:N NPs is illustrated in the paper. The results obtained from the X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and enzyme quantitative studies were correlated with the proposed dye degradation mechanism of the vermiwash activated ZnO:Cu:N nanomaterial. The synthesized nanomaterials have good reproducibility and stability. The results showed that the synthesized vermiwash activated ZnO:Cu:N NPs have great potential for the effective degradation of various toxic organic dyes.
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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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    INFLUENCE OF MANGANESE DIOXIDE NANOPARTICLES ON MOS2/PANI NANOSHEETS AND ITS ENERGY STORAGE APPLICATIONS
    (Springer Link, 2023-04-01) Kiruthika, 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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    ROLE OF GRAPHENE OXIDE/YTTRIUM OXIDE NANOCOMPOSITES AS A CATHODE MATERIAL FOR NATURAL DYE-SENSITIZED SOLAR CELL APPLICATIONS
    (Wiley, 2021) Shanmugapriya, T; Balavijayalakshmi, J
    Natural dye-sensitized solar cells (DSSCs) are becoming promising candidates for replacing synthetic dyes. Graphene oxide is prepared from natural graphite flakes by modified Hummers method. A novel graphene oxide/yttrium oxide (GO/Y2O3) nanocomposites are prepared by chemical precipitation method. The different concentration of (5:1, 5:2, and 5:3) of yttrium oxide nanoparticles exaggerated on the surface of graphene oxide nanosheets. The prepared nanocomposites are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectroscopy (EDAX), Fourier transform infrared spectroscopy (FT-IR), Raman scattering spectroscopy and ultraviolet–visible (UV–vis) absorption spectroscopy. The XRD analysis showed that the crystallite size of the GO/Y2O3 (5:1, 5:2, and 5:3) is found to be around 23, 25.2, and 26.92 nm. Field emission scanning electron microscopy (FE-SEM) revealed that the flakes like shaped yttrium oxide nanoparticles are uniformly dispersed on the surface of GO sheets. The UV–vis studies showed that the prepared Jasminoum grandiflorum L (JG) dye belongs to chlorophyll group with the absorption of 4.2 eV. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV) technique. The power conversion efficiency of prepared sandwich type DSSCs (5:3) is found to be 1.67%.
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    MICROWAVE ASSISTED SYNTHESIS OF MOS2/PANI/ZNO NANOCOMPOSITES AS A WORKING ELECTRODE FOR ENERGY STORAGE APPLICATIONS
    (Asian Journal of Chemistry, 2021-06-26) 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
    (Springer Link, 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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    IMPACT OF MOLYBDENUM ON STRUCTURAL AND MORPHOLOGICAL PROPERTIES OF MANGANESE FERRITE NANOPARTICLES BY HYDROTHERMAL METHOD
    (Elsevier, 2020) Kaveri, N; Balavijayalakshmi, J
    The study of transition metal ferrites have vast applications from microwave to radio-wave frequencies and are 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.
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    ELECTROCHEMICAL INVESTIGATION OF NITROGEN DOPED GRAPHENE OXIDE/YTTRIUM OXIDE NANOCOMPOSITES
    (Journal of Nano- and Electronic Physics, 2019-10-25) Shanmugapriya, T; Balavijayalakshmi, J
    Graphene oxide is one of the most promising materials for electronic devices because of its unique properties. It is prepared from natural graphite flakes by modified Hummers method. A novel nitrogen doped graphene oxide/yttrium oxide (NGO/Y2O3) nanocomposites are prepared by chemical precipitation method. The X-ray diffraction analysis shows that the crystallite size of the NGO/Y2O3 is found to be around 23 nm, and scanning electron microscopy (SEM) reveals that the nanoparticles are uniformly dispersed on the surface of NGO sheets. FTIR spectra are employed to investigate the bonding interaction in GO and NGO/Y2O3 nanocomposites. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV) technique. The reduction peak current of NGO/Y2O3 is enhanced and reduction peak potential is increased which shows high current response in NGO/Y2O3 nanocomposites compared to Y2O3 nanocomposites. This suggests that the prepared nanocomposites have excellent electrochemical behavior and can be applied for supercapactior and solar cell applications.
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    POLYMER FUNCTIONALIZED CARBON/METAL NANOHYBRIDS AS A VERSATILE ELECTROCHEMICAL SENSOR FOR THE DETECTION OF P-AMINOPHENOL
    (IOP Publishing Ltd, 2019-04) Yuvashree, S; Balavijayalakshmi, J
    A novel electrochemical sensor to determine p-Aminophenol is fabricated using silver nanoparticles decorated reduced graphene oxide- chitosan nanocomposites. The RGO/CS/Ag nanocomposites are synthesized by chemical reduction method. The structural, spectral, morphological and elemental studies of the synthesized nanocomposites are characterized by x-ray powder diffraction (XRD), Fourier transform infrared spectrum (FTIR), Scanning electron microscopy (SEM) and Energy Dispersive x-ray Analysis (EDAX). The electrochemical investigations indicate that the Glassy carbon electrode modified nanocomposites possessed an excellent performance towards the detection of p-Aminophenol. Under the optimized conditions, the detection limit of p-Aminophenol obtained in this work is 10 μM and a wide linear range of detection is found to be 10 μM to 600 μM. Thus the proposed sensor can be applied in environment for the determination of p-Aminophenol.
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    INFLUENCE OF GOLD NANOPARTICLE CONCENTRATION ON POLYMER FUNCTIONALIZED REDUCED GRAPHENE NANOSHEETS AND ITS ELECTROCHEMICAL SENSING PERFORMANCE
    (IOP Publishing Ltd, 2019-04) Ramalakshmi, V; Balavijayalakshmi, J
    The different concentrations (0.002 M, 0.004 M, 0.006 M, 0.008 M and 0.01 M) of gold nanoparticles encapsulated β-cyclodextrin functionalized reduced graphene oxide nanocomposites (rGONS/β-CD/Au) synthesized via wet chemical method is reported. The synthesized rGONS/β-CD/Au nanocomposites are investigated using FTIR, XRD, SEM, EDS and TEM analysis. The FTIR spectra reveal that the blue shift in the bands may be due to the intermolecular interaction between reduced graphene oxide and cyclodextrin. From XRD analysis the average crystallite size is found to be around 10 nm, which is in good agreement with TEM analysis. The SEM analysis shows the spherical structure of the gold nanoparticles. The glassy carbon electrode (GCE) modified with the synthesized rGONS/β-CD/Au nanocomposites of 0.006 M concentration is employed for the sensitive detection of different nitrophenols such as ortho-nitrophenol (o-NP), para-nitrophenol (p-NP) and meta-nitrophenol (m-NP) by using electrochemical techniques and the result displays a wide detection range for all the nitrophenol isomers.