F-KCW-Department Publications

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Author: search.filters.author.Balavijayalakshmi JSubject: search.filters.subject.FT-IR

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    CARICA PAPAYA PEEL MEDIATED SYNTHESIS OF SILVER NANOPARTICLES AND ITS ANTIBACTERIAL ACTIVITY AGAINST HUMAN PATHOGENS
    (Elsevier, 2017-10-01) Balavijayalakshmi J; Ramalakshmi V
    Metallic nanoparticles are traditionally synthesized by wet chemical techniques, in which the chemicals used are quite often toxic and flammable. Ripe carica papaya peel is found to be a suitable source for green synthesis of silver nanoparticles. In the present work, a cost effective and environmental friendly technique for the green synthesis of silver nanoparticles from 1 mM silver nitrate (AgNO3) solution through the extract of ripe Carica papaya peel of various concentrations (5 ml, 10 ml, 15 ml, 20 ml, 25 ml) is described. The synthesized silver nanoparticles are characterized by using the UV–vis absorption spectroscopy, FT-IR, XRD, SEM and TEM. The formation of silver nanoparticles is confirmed by surface plasmon resonance, determined by UV–vis spectra at 400–435 nm. The shift in the absorption bands and variation in the calculated optical band gaps for the various concentrations of papaya peels extracts are also observed. The FT-IR spectra reveal that an increase in the concentration of the papaya peel extract shifts the bands to higher wavelengths. The average crystallite size for various concentrations of papaya peel extract is observed from XRD spectral analysis and is found to be around 16–20 nm, which is in good agreement with the TEM analysis. The SEM analysis shows the spherical structure of the silver nanoparticles with some agglomeration for higher concentrations of papaya peel extract. The synthesized silver nanoparticles show good antibacterial activity against human pathogens such as Escherichia coli and Staphylococcus aureus and it has many medical applications
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    IMPACT OF IRON DOPING ON STRUCTURAL AND OPTICAL PROPERTIES OF NICKEL SULPHIDE NANOPARTICLES
    (Elsevier, 2022-01-01) Balavijayalakshmi J; Sonia D
    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 nanoparticles are synthesized using chemical precipitation method. Nickel chloride and Ferric chloride are used as precursors and sodium sulphide as a stabilizing agent. The performance of the synthesized nanoparticles are analysed by varying the molarity of the iron chloride from 0.01 M to 0.05 M. The synthesized nanoparticles are characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Ultraviolet Visible spectroscopy (UV–Vis) and Photoluminescence (PL) studies. FT-IR spectral analysis shows the band at 630 cm−1 corresponds to the bending vibration of metal sulphur bond (Ni-S) and the bands observed around 585 cm−1 and 456 cm−1 are ascribed to Fe–O stretching vibrations of tetrahedral and octahedral lattice sites respectively. The XRD analysis shows the crystalline nature of nanoparticles and the average nano-crystallite size is found to be 18 nm − 26 nm. The crystallite size increases with increase in the concentration of iron. The morphology of the samples is analyzed using scanning electron microscope and is found to be spherical in shape. The optical properties are characterized using UV–Vis spectral analysis and PL study. UV–Visible absorption spectra show absorption peaks of iron doped nickel sulphide nanoparticles and the band exhibits a blue shift, indicates quantum size effect. Electrochemical studies revealed two oxidation peaks at a potential about −0.3 V and 0.7 V for pure nickel sulphide nanoparticles and in addition to it, a redox peak is observed at a potential about −0.5 V due to the doping of iron into the nickel sulphide nanoparticles. The synthesized nanoparticles may be used as high-performance electrode materials for supercapacitor applications.
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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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    INFLUENCE OF AG DOPING ON STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF ZINC OXIDE NANOPARTICLES
    (PSGR Krishnammal College for Women, Coimbatore, 2016-01-07) Devaki M; Balavijayalakshmi J
    A wide range of investigations have been focused on transition metals doped II-VI compound semiconductor ZnO, because of its direct band gap of 3.37 eV at room temperature. It has attracted intensive research effort for its unique properties and versatile applications in transparent electronics, ultraviolet (UV) light emitters, piezoelectric devices, chemical sensors and spintronics. Nano zinc oxide is non-toxic and has also been identified as a promising semiconductor material for exhibiting ferromagnetism at room temperature when doped with the transition metal elements. Transition metal doped nanostructure is an effective method to adjust the energy level surface states of ZnO. This can further be improved by varying the doping concentrations of doped materials and thereby changing its physical, especially optical properties. An attempt is made to synthesize Ag doped Zinc oxide nanoparticles by chemical precipitate method. The synthesized nanoparticles are analyzed using FT-IR, UV, XRD and SEM. These nanoparticles may be used in various optoelectronic device applications like solar cells and sensors.
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    STRUCTURAL AND MAGNETIC PROPERTIES OF MAGNESIUM FERRITE NANOPARTICLES BY CO-PRECIPITATION METHOD
    (Karunya University, Coimbatore, 2013-10-01) Balavijayalakshmi J; Greeshma; Komal S
    Spinel ferrites are commercially important materials because of their excellent magnetic and electrical properties. Nano-structured materials are now being studied intensively due to their novel physicochemical properties. Magnesium ferrites are considered as the most versatile ferrite due to its high resistivity and low eddy currents for high frequency applications. Microstructure and magnetic properties of magnesium ferrites are highly sensitive to composition, sintering conditions, grain size, impurities and the preparation methodology. It is a partially inverse spinel and its degree of inversion is sensitive to the thermal history of the sample, microstructure and preparative parameters. These nanoparticles are successfully prepared by co-precipitation method. Magnesium chloride [MgCl2. 6H2O], anhydrous Ferric chloride [Fecl3] and sodium hydroxide are used as raw materials. Magnesium ferrite sample sintered 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 sample are studied using Vibrating Sample Magnetometer.
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    EFFECT OF CO-AG DOPING ON STRUCTURAL AND OPTICAL PROPERTIES OF ZINC OXIDE NANOPARTICLES
    (PSGR Krishnammal College for women / Advances in Applied Research, 2016) Meena K; Balavijayalakshmi J
    Co-Ag co-doped Zinc oxide nanoparticles were synthesized by chemical co-precipitation method. The synthesized nanoparticles were subjected to X-ray diffraction technique and the average crystallite size was found to be around 29 - 31 nm. The crystallite size increased as the cobalt concentration increased. The optical properties were characterized by UV-Vis and PL spectral analysis. The FT-IR spectra of the samples were recorded and the characteristic absorption bands shifted to lower values as the cobalt concentration increased. The SEM analysis showed sphere shaped particles distributed uniformly. These co-doped (Co,Ag) ZnO nanoparticles may be used in optoelectronics, spintronics, as antibacterial reagents to treat diseases caused by bacteria and fungi and in waste water treatment.
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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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    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.