F-KCW-Department Publications

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Author: search.filters.author.Shanmugapriya TSubject: search.filters.subject.XRD

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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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    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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    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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    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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    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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    ELECTROCHEMICAL INVESTIGATION OF NITROGEN DOPED GRAPENE OXIDE/ YTTRIUM OXIDE NANOCOMPOSITES
    (Sumy State University / Journal of nano and electronic physics, 2019) 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.