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    PREPARATION AND PROPERTIES OF QUATERNARY SEMICONDUCTOR CU2NISNS4 (CNTS)) NANOPARTICLES FOR POTENTIAL SOLAR ABSORBER MATERIALS
    (SRM Institute of Science and Technology, 2019-01-28) Deepika R; Meena P
    Phase pure Cu2ZnSnS4 (CZTS) and its related quaternary chalcogenides are promising material for photovoltaic applications. The incorporation of transition metal cations into any semiconductor systems may led to very interesting physical and chemical properties which make them suitable for applications in optoelectronic devices. In this study, a novel synthesis of Cu2NiSnS4 (CNTS) quaternary nanoparticles by the facile Chemical Route Method. The structural, morphological, optical and electrical characteristics of the synthesized nanoparticles have been analyzed. The results obtained confirm the formation of phase pure CNTS nanoparticles. The average size of the synthesized nanoparticles is estimated to be around 30nm. The obtained optical band gap of the CNTS nanoparticles are in good agreement with the optimum value required for an absorber material in photovoltaic solar energy-conversions. This study shows the viability of synthesizing nanoparticles with elements which are abundantly available by using an environmentally-friendly and low cost process which is potential for energy- conversion applications.
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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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    STRUCTURAL AND MORPHOLOGICAL INVESTIGATION ON ALUMINIUM DOPED COPPER OXIDE NANOPARTICLES
    (BIT, Sathyamangalam, 2017-08-17) Vidhya Priya P; Balavijayalakshmi J
    The oxides of transition metals are an important class of semiconductors which have a wide range of applications because of its unique properties. Among these, copper oxide nanoparticles are of special interest because of its narrow band gap. Also, Aluminium is the most preferred dopant element because of its small ionic radius and low material cost. Hence in this present work, a novel idea of doping aluminium in copper oxide nanoparticles are carried out using hydrothermal method. The optical and structural properties of aluminium doped copper oxide nanoparticles are studied using UV-Vis and X-ray diffraction analysis. The FT-IR spectral analysis confirms the presence of functional groups in the prepared samples. XRD analysis shows that the synthesized nanoparticles are well crystalline in nature. The morphology of the samples are studied using scanning electron microscope. These nanoparticles may be tested for solar cell applications.
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    IMPACT OF AL DOPING ON THE STRUCTURAL, AND MAGNETIC PROPERTIES OF MAGNESIUM-COBALT MIXED FERRITE NANOPARTICLES
    (Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 2016-12-15) Kalaiarasi S; Balavijayalakshmi J
    Magnesium ferrites have wide range of applications in water purification, ferrofluids, bio-molecule separation, colour imaging, and gas sensing applications. The chemical, structural, and magnetic properties of these magnesium ferrite nanoparticles can be enhanced by their composition and micro structures. Hence in the present work, an attempt is made to synthesize Aluminium doped magnesium-cobalt mixed ferrite nanoparticles (Mg0.4Co0.4Al0.2Fe2O4) by co-precipitation method. Magnesium chloride, Cobaltous chloride, Aluminium Chloride and sodium hydroxide are used as raw materials. The synthesized nanoparticles are annealed at 600○C and are subjected to X-ray diffraction technique to calculate the average nano-crystalline size using Debye – Scherrer formula. The FT-IR spectrum of the sample is recorded and the characteristic absorption bands are observed. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). The magnetic measurements are made using Vibrating sample magnetometer (VSM). These materials can be tested for gas sensing applications.
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    INVESTIGATION ON THE STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF IRON DOPED NICKEL SULPHIDE NANOPARTICLES
    (Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 2016-12-15) Nandhini R; Balavijayalakshmi J
    Semiconductor nanoparticles doped with transition metal ions have attracted much attention because of its applications in the field of electroluminescence devices, phosphors, light emitting displays 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 optical properties are characterized using UV-Vis spectral analysis and PL study. 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 are analyzed using scanning electron microscope. The synthesized nanoparticles may be used for waste water treatment.
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    INVESTIGATION ON THE HYDROTHERMAL SYNTHESIS OF PURE AND ALUMINIUM DOPED COPPER OXIDE NANOPARTICLES
    (Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 2016-12-15) Balavijayalakshmi J; Vidhya Priya P
    The oxides of transition metals are an important class of semiconductors and have a wide attention due to their unique properties. Among these, copper oxide nanoparticles are of special interest because of its narrow band gap and have immense potential applications in the field of solar energy. These copper oxide nanoparticles and Aluminium doped copper oxide nanopartciles are synthesized using hydrothermal method. The optical and structural properties of pure and aluminium doped copper oxide nanoparticles are studied using UV-Vis, PL and X-ray diffraction analysis. The FT-IR spectral analysis confirms the presence of the functional groups in the prepared samples. XRD analysis shows that the synthesized nanoparticles are well crystalline in nature. The morphology of the samples are studied using scanning electron microscope.
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    IMPACT OF ANNEALING ON STRUCTURAL AND MAGNETIC PROPERTIES OF MANGANESE DOPED MAGNESIUM-COBALT MIXED FERRITE NANOPARTICLES
    (Jammal Mohamed College, Trichy, 2016-02-29) Balavijayalakshmi J; Annie Josph C
    Manganese doped magnesium-cobalt mixed ferrite nanoparticles (Mg0.4Co0.4Mn0.2Fe2O4) are synthesized by co-precipitation method and are annealed at 130○C, 600○C and 900○C. The synthesized nanoparticles are characterized using X-ray diffraction (XRD) analysis, FT-IR spectral analysis, Scanning Electron Microscopy (SEM) analysis and Vibrating Sample Magnetometer (VSM) analysis. The crystallite size is found to be 17 nm and 19.6 nm for the samples annealed at 600○C and 900○C respectively. The crystallite size and lattice constant increases as the samples are annealed at higher temperatures. FT-IR analysis confirms the characteristic absorption bands at 590 cm-1 and 546 cm-1 for tetrahedral sites and 416 cm-1for octahedral sites. SEM analysis shows uniformly distributed elliptical shaped nanoparticles. The saturation magnetization, remanent magnetization and coercivity increases due to the inclusion of manganese and as the annealing temperature increases. These samples can be used for gas sensing applications.
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    EFFECT OF MN DOPING ON STRUCTURAL, MAGNETIC AND MORPHOLOGICAL PROPERTIES OF MAGNESIUM-COBALT MIXED FERRITE NANOPARTICLES
    (PSG College of Technology, Coimbatore, 2015-12-30) Balavijayalakshmi J; Annie Josphine C
    Nano structured magnetic materials have wide areas of applications in water purification, high density data storage, ferrofluids, bio-molecule separation, colour imaging, medical diagnosis, drug delivery and so forth. Among the ferro spinels, Magnesium ferrite belongs to a class of compounds having the general formula MgFe2O4 crystallizing with the spinel structure. It is a typical spinel in which the cation distribution in the crystal lattice site is very much sensitive to heat treatment due to high diffusibility of Mg2+ ions. The physical and chemical properties of ferrites are dependent upon factors such as annealing temperature, annealing time, rate of heating and rate of cooling, etc. In case of cobalt ferrite, the incorporation of cobalt ions results in an increase in coercivity, which is due to the coupling of the spins of cobalt and iron ions. Also, manganese ferrite is considered versatile and of higher significance owing to its high saturation magnetization and low power loss at high frequencies. In the present work, an attempt is made to synthesize manganese doped magnesium-cobalt mixed ferrite nanoparticles (Mg0.4Co0.4Mn0.2Fe2O4) by co-precipitation method. Magnesium chloride, Cobaltous chloride, Manganese Chloride and sodium hydroxide are used as raw materials. The synthesized nanoparticles are annealed at 600○C and are subjected to X-ray diffraction technique to calculate the average nano-crystalline size using Debye – Scherrer formula. The FT-IR spectrum of the sample is recorded and the characteristic absorption bands are observed. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). The magnetic measurements are made using Vibrating sample magnetometer (VSM). These materials can be tested for gas sensing applications.
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    IMPACT OF CO-AG DOPING ON STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF ZINC OXIDE NANOPARTICLES
    (PSG College of Technology, Coimbatore, 2015-12-30) Balavijayalakshmi J; Meena K
    Zinc oxide nanoparticles have attracted great attention in recent years because of its unique properties and versatile applications in transparent electronics, ultraviolet (UV) light emitters, piezoelectric devices, chemical sensors and spintronics. ZnO has high chemical stability and low toxicity, which is widely used as an active ingredient for dermatological applications in creams, lotions and ointments on an account of its antibacterial properties. Doped ZnO shows maximum effect against pathogenic organisms as compared to ZnO, there by using nanoparticles as an antimicrobial agent. In the present investigation, an attempt is made to synthesize Co-Ag co-doped Zinc oxide nanoparticles by chemical co-precipitation method. Zinc Chloride, Cobaltous chloride, Silver nitrate and sodium hydroxide is used as raw materials. The synthesized nanoparticles are subjected to X-ray diffraction technique to calculate the average nano-crystalline size using Debye – Scherrer formula and are found to be around 25 nm. The optical properties are characterized by UV-Vis spectral analysis. The FT-IR spectrum of the sample is recorded and the characteristic absorption bands are observed. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). These co-doped (Co, Ag) ZnO nanoparticles may be used as antibacterial reagents to treat diseases caused by bacteria and fungi.