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Author: search.filters.author.Balavijayalakshmi JSubject: search.filters.subject.Debye – Scherrer

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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.
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    EFFECTS OF ANNEALING ON STRUCTURAL AND MAGNETIC PROPERTIES OF COBALT DOPED MAGNESIUM FERRITE NANOPARTICLES
    (PSG IAS, Coimbatore, 2015-08-07) Balavijayalakshmi J; Sudha T
    Nano-structured materials are now being studied intensively due to their novel physicochemical properties. Applications of gas sensors have been growing at a consistent pace in the recent years. The mixed-metal oxide gas sensors offer advantages over other gas sensors devices due to their simple implementation, low cost and good reliability for real time control systems. To search for new good gas-sensing materials and the new properties of conventional materials has become an active research field. Among different ferrites, magnesium ferrite enjoys a special attention because of its vast applications in high density recording media, heterogeneous catalysis, adsorption, sensors and magnetic technologies. Also the technological importance of cobalt ferrite has motivated several studies on the synthesis as well as the physical properties of this material. Hence an attempt is made to synthesize cobalt doped magnesium ferrite nanoparticles by co-precipitation method. Magnesium chloride [MgCl2. 6H2O], Cobaltous Chloride [CoCl2.6H2O], anhydrous Ferric Chloride [FeCl3] along with sodium hydroxide [NaOH] is used as raw materials. Magnesium-Cobalt ferrite sample annealed at 130○C, 600○C and 900○C are subjected to X-ray diffraction to calculate the average nano-crystalline size using Debye – Scherrer formula. The FT-IR spectra of the samples are recorded to ensure the presence of the metallic compounds. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). The magnetic properties of the cobalt doped magnesium ferrite nano particles are studied using Vibrating Sample Magnetometer (VSM). These samples can be tested for gas sensing applications.
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    INVESTIGATION ON STRUCTURAL AND MAGNETIC PROPERTIES OF COBALT DOPED MAGNESIUM FERRITE NANOPARTICLES
    (SRM University, Kattankulathur, Chennai, 2015-02-04) Balavijayalakshmi J; Sudha T; Karthika K
    Nanosized spinel ferrites have attracted considerable attention for their interesting structural, magnetic and electrical properties. The physical and chemical properties of nanomaterials have been enhanced because of their surface-to-volume ratio. To search for new good gas-sensing materials and the new properties of conventional materials has become an active research field. Magnesium ferrite is a most versatile ferrite, due to its high resistivity and low eddy currents. Also the technological importance of cobalt ferrite has motivated several studies on the synthesis as well as the physical properties of this material. Hence an attempt is made to synthesize cobalt doped magnesium ferrite nanoparticles (Mg0.6Co0.4Fe2O4) by co-precipitation method. Magnesium chloride [MgCl2. 6H2O], Cobaltous Chloride [CoCl2.6H2O], anhydrous Ferric Chloride [FeCl3] along with sodium hydroxide [NaOH] is used as raw materials. Magnesium-Cobalt ferrite sample annealed at 600○C are subjected to X-ray diffraction to calculate the average nano-crystalline size using Debye – Scherrer formula. The FT-IR spectra of the sample are recorded to ensure the presence of the metallic compounds. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). The magnetic properties of the cobalt doped magnesium ferrite nano particles are studied using Vibrating Sample Magnetometer (VSM).
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    SYNTHESIS AND CHARACTERIZATION OF CUPRIC CHLORIDE DOPED ZINC SULPHIDE NANOPARTICLES
    (SRM University, Kattankulathur, Chennai, 2015-02-04) Balavijayalakshmi J; Manju S; Lavanya S
    In recent years, the research on semiconductor nanoparticles has stimulated much interest because of their unique optical and electrical properties. The nanosized semiconductor crystallites could produce optical properties which are different from bulk materials. Among the semiconductor nanoparticles, Zinc Sulphide is an important II–VI semiconductor material researched extensively because of its wide range of applications in electroluminescence devices, phosphors, light emitting displays and optical sensors. Semiconductor nanoparticles doped with transition metal ions have attracted much attention because of their luminescent properties. Hence an attempt is made to synthesize cupric chloride doped zinc sulphide nanoparticles. The synthesized nanoparticles are subjected to X-ray diffraction to calculate the average nano-crystalline size using Debye – Scherrer formula. The optical properties of the samples are studied using UV-Vis Spectroscopy. The morphological analysis of the sample is studied using Scanning Electron Microscope (SEM). FT-IR spectroscopy is used to determine the chemical bonding in the synthesized sample.