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

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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. .
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    NITROGEN DOPED GRAPHENE OXIDE/YTTRIUM OXIDE AS A COUNTER ELECTRODE MATERIAL FOR DYE SENSITIZED SOLAR CELLS
    (SRM IST, Chennai., 2019-01-28) Shanmugapriya T; Balavijayalakshmi J
    Solar cells are based on semi-conducting components that once assembled properly can convert successfully sunlight into electricity. Dye Sensitized Solar Cells are currently the most efficient third-generation solar technology. Natural dye sensitized solar cells are becoming promising candidates for replacing synthetic dyes. 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 hummer’s method. A novel Nitrogen doped Graphene oxide/yttrium oxide (NGO / Y2O3) nanocomposites are prepared by chemical precipitation method. The structure of the prepared nanocomposites is investigated by X-Ray diffraction analysis and the morphological properties of the prepared nanocomposites are investigated by scanning electron microscopy (SEM). The presence of functional groups in the synthesized nanocomposites is studied by Fourier transform infrared spectroscopy (FT-IR). The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV). The prepared nanocomposites can be applied for dye sensitized solar cell applications.
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    ELECTROCHEMICAL INVESTIGATION OF POLYMER FUNCTIONALIZED REDUCED GRAPHENE OXIDE/ ZINC OXIDE NANOCOMPOSITES FOR THE DETECTION OF P-AMINOPHENOL
    (SRM IST, Chennai, 2019-01-01) Yuvashree S; Balavijayalakshmi J
    In this study a novel electrochemical sensor based Zinc oxide nanoparticles ensembled on polymer functionalized reduced graphene oxide nanocomposites have been used for the selective detection of p-Aminophenol [1]. The nanocomposites were synthesized using chemical reduction method. The synthesized nanocomposites were characterized using FT-IR, XRD, SEM and EDAX. The electrochemical properties of the nanocomposites were investigated using cyclic voltammetry [2]. Under optimized conditions, the fabricated electrode showed a linear range from 10µM to 500 µM with the low detection limit of 0.5 µM. Hence, the polymer functionalized reduced graphene oxide/Zinc oxide nanocomposites modified GCE showed high electrocatalytic activity towards the oxidation of p-Aminophenol. The prepared sensor can be used for real time detection in waste water [3].
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    NITROGEN DOPED GRAPHENE OXIDE / NICKEL OXIDE HYBRIDS FOR DYE SENSITIZED SOLAR CELL APPLICATIONS
    (Centre for NanoScience and Technology, Institute of Science and Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad, 2018-10-04) Shanmugapriya T; Balavijayalakshmi J
    Solar energy plays 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) are gaining considerable interest as alternatives to the semiconductor-based thin film solar cells. Natural dye sensitized solar cells are becoming promising candidates for replacing synthetic dyes. Graphene oxide exhibits impressive photoelectric properties, large surface area, high charge-carrier mobility, high conductance and fast electron transfer.These great features offer graphene oxide as most promising materials for various potential applications. Nickel Oxide are of particular interest because of its good electro-catalytic properties, low toxicity and low cost, which makes 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 are prepared by chemical precipitation method. The structural and morphological of the prepared nanocomposites areinvestigated by X-Ray diffraction analysis and 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 are suitable for dye sensitized solar cell applications.
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    A STUDY ON STRUCTURAL, SPECTRAL AND MORPHOLOGICAL ANALYSIS OF POLYMER FUNCTIONALIZED GRAPHENE OXIDE – METAL OXIDE NANOCOMPOSITES FOR REMOVAL OF DYES FROM AQUEOUS SOLUTION
    (Centre for NanoScience and Technology, Institute of Science and Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad, 2018-10-04) 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 oxides (GO) and reduced graphene oxides (rGO) are ideal platforms for constructing graphene-based nanostructures for various applications. Chitosan(CS) is a natural bio polysaccharide and the most abundant polymer. It has attracted considerable research interest due to its tremendous applications in agriculture, biopesticides etc. Manganese oxides are attractive inorganic materials owing to their low cost, high chemical stability, high electro chemical activity and eco friendly nature, which have a wide range of applications in super capacitors, heavy metal ion removal, dye removing etc. In this present work, graphene oxide is prepared from natural graphite flakes by modified hummers method and then graphene oxide /chitosan/MnO2 nanocomposites is synthesised via. chemical reduction 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 are used for dye removing application. The adsorption properties of graphene oxide /chitosan /MnO2 towards industrial dyes are investigated along with measured effect of adsorption by initial concentration, contact time and pH values. The resulting adsorption isotherm is analyzed systematically. These nanocomposites are found to be more efficient adsorbent for the removal of anionic industrial dyes.
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    METAL OXIDE EMBELLISHED ON POLYMER FUNCTIONALIZED REDUCED GRAPHENE OXIDE FOR ELECTROCHEMICAL DETECTION OF HYDROGEN PEROXIDE
    (International and Interuniversity Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi University, Kottayam, Kerala, 2018-05-11) Yuvashree S; Balavijayalakshmi J
    In this study, copper oxide nanoparticles decorated reduced graphene oxide-chitosan nanocomposites are prepared for reliable detection of hydrogen peroxide (H2O2). The RGO-CS-CuO nanocomposites are synthesized by chemical reduction method. The morphological and chemical structures of the nanocomposites are systemically evaluated by Fourier Transform Infrared Spectral Analysis (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman analysis. A potential application of RGO-CS-CuO nanocomposites-modified electrode as a biosensor to monitor H2O2 has been investigated. The electrochemical properties of the biosensor are investigated by cyclic voltammetry (CV). After optimizing all the experimental parameters, the RGO-CS-CuO nanocomposites on modified GCE showed a good performance towards the electrocatalytic reduction of H2O2. This method is simple, cost effective, sensitive and also can be used for the determination of H2O2 in real water sample.
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    SYNTHESIS AND CHARACTERIZATION OF GRAPHENE OXIDE BASED METAL NANOCOMPOSITES
    (Royal Book publishers / PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) Yuvashree S; Balavijayalakshmi J; Sharvasri S
    Graphene, a monolayer of carbon atoms packed into a dense honeycomb crystal structure has attracted considerable attention and numerous investigations because of its unique nanostructure and its extraordinary properties. 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. In this present work, metal nanoparticles are decorated onto the graphene surface which helps to increase the conductivity of nanocomposites and enhances the properties of the material. Thus graphene based metal nanocomposites are prepared by chemical reduction method. 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). XRD reveals that the product is well crystallized. Thus the prepared nanocomposites can be applied for biomedical applications.
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    A FACILE SYNTHESIS AND INVESTIGATION ON METAL OXIDE NANOPARTICLES EMBELLISHED GRAPHENE OXIDE NANOCOMPOSITES
    (Royal Book publishers / PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) Ramalakshmi V; Balavijayalakshmi J; Roshini P
    Graphene is a flat monolayer of carbon atoms with sp2-hybridized two-dimensional carbon structure. Graphene’s fascinating high conductivity, superior electron mobility, extremely high specific surface area and easy functionalization make graphene a good substrate to yield graphene-based nanocomposites. Metal oxides nanomaterials have considerable attention due to their unique properties that can be used for designing advanced nanodevices. Thus, in the present study metal oxide nanoparticles embellished graphene oxide nanosheets (GNs) is synthesized and characterized. The graphene oxide nanosheets are produced by modified Hummer’s method. The metal oxide nanoparticles are loaded on the synthesized graphene oxide nanosheets via chemical reduction method. The metal oxide nanoparticles embellished graphene oxide nanosheets are characterized using Fourier transform infrared spectroscopy (FT-IR), X-Ray diffraction analysis and Field emission scanning electron microscopy (FE-SEM). The structural properties of the synthesized nanocomposites are characterized using X-Ray diffraction analysis and the result confirms that the synthesized nanocomposites are well crystalline. The morphology of synthesized nanocomposites is analyzed using field emission scanning electron microscopy analysis.
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    INFLUENCE OF IRON ON THE STRUCTURAL AND OPTICAL PROPERTIES OF NICKEL SULPHIDE NANOPARTICLES
    (Royal Book publishers / PSGR Krishnammal College for Women, Coimbatore., 2018-01-03) Sonia D; Balavijayalakshmi J
    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 nanopartciles are synthesized using chemical precipitation method. Nickel chloride and Ferric chloride are used as precursors and sodium sulphide as a stabilizing agent. The synthesized nanoparticles are characterized using FT-IR, XRD, SEM, UV-Vis, and PL studies. The presence of function groups are confirmed from FT-IR spectral analysis. The XRD analysis shows the crystalline nature of nanoparticles and the average nano-crystalline size is calculated using Debye – Scherrer formula. The morphology of the samples is analyzed using scanning electron microscope. The optical properties are characterized using UV-Vis spectral analysis and PL study. The synthesized nanoparticles may be used as a catalyst for degradation of organic dyes.
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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.