Browsing by Author "Selleswari D"

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DESIGN OF CUO/SNO2 HETEROJUNCTION PHOTOCATALYST WITH ENHANCED UV LIGHT-DRIVEN PHOTOCATALYTIC ACTIVITY ON CONGO-RED AND MALACHITE GREEN DYES
(Springer Berlin Heidelberg, 2019-06-01) Selleswari D; Meena P; Mangalaraj D
In this work, CuO–SnO2 composite thin films were prepared by spray pyrolysis method using copper acetate and tin chloride dihydrate as raw materials. The structural, morphological and optical properties of the prepared nanocomposite were systematically investigated by X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV–Vis absorption spectra analysis. The calculated grain size was in the range from 27 to 54 nm. SEM images reveal a spherical shaped morphology with an average diameter of around 10–15 nm. EDX analysis confirms the composition of the deposited thin films. The band gap of the composite thin films obtained from the optical absorption spectra is observed to be in the range from 2.98 to 3.67 eV. The photocatalytic activity of the nanocomposite was investigated using congo-red (CR) and malachite green (MG) under UV light irradiation. The results showed that the CuO–SnO2 composite exhibits superior photocatalytic performance towards CR such as high degradation efficiency (97%) and long term stability (only 3% loss) after a seven cycles test. This enhanced photocatalytic activity can be attributed to the low recombination probability of photo-induced carriers due to the efficient charge transfer in the nanocomposites. The improved photocatalytic mechanism of CuO–SnO2 composite is also discussed in brief.
EFFECT OF SURFACTANT ON STRUCTURAL, MORPHOLOGICAL, OPTICAL AND ELECTRICAL PROPERTIES OF CUO NANOPARTICLES AND ITS P-N JUNCTION DIODE APPLICATION
(Technical Research Organisation India (Troindia), 2017) Selleswari D; Meena P; Mangalaraj D; Jeevitha G
The copper oxide (CuO) nanoparticles (NPs) were prepared simply by Hydrothermal process using various concentration of the surfactant of cetyltrimethyl ammonium bromide (CTAB –0.05 and 0.1 M) and their by structural, optical, dc electrical and diode properties have been analyzed. From the XRD analysis, the crystallite size of the CTAB assisted CuO NPs was reduced. The CTAB caused an increase in the optical absorbance and band gap of the NPs. The morphological changes in the sponge, plate like structure under the strong influence of the surfactant were observed from SEM analysis. The FT-IR spectrum confirmed that the presence of Cu and O elements. The dc electrical analysis revealed that conductivity increased while using CTAB. The electrical parameters of ideality factor (n), barrier height (ФB), series resistance (Rs) and interface properties for the n-Si/p-CuO diodes have been analyzed by the I-V method.
EFFECT OF SURFACTANT ON STRUCTURAL, MORPHOLOGICAL, OPTICAL AND ELECTRICAL PROPERTIES OF CUO NANOPARTICLES FOR APPLICATION IN P-N JUNCTION DIODE
(Bannari Amman Institute of Technology, Sathyamangalam, 2017-08-17) Selleswari D; Meena P; Mangalaraj D; Jeevitha G
Copper oxide nanomaterials have kindled the interest of researchers in view of their potential applications in electronic devices. In the present work, Copper oxide (CuO) nanoparticles were prepared through the simple hydrothermal method using two different concentrations (0.1 and 0.5 M) of the surfactant (CTAB) and their structural, optical, electrical and diode properties have been analyzed. From the XRD analysis, it was observed that the surfactant reduced the crystallite size of the CuO nanoparticles. It also caused an increase in the optical band gap and absorbance. The SEM analysis showed the strong influence of the surfactant on the structure of the nanoparticles. The presence of Cu and O elements was confirmed from the FT-IR spectrum. The study of the electrical properties revealed that the conductivity increased on using CTAB. The electrical parameters such as ideality factor (n), barrier height (ФB) and series resistance (Rs), and interface properties for the p-Si/CuO/Ag diodes have been analyzed by the I-V method.
ROLE OF CTAB ON STRUCTURAL AND OPTICAL PROPERTIES OF NANOSTRUCTURED CUO FOR SOLAR CELL APPLICATIONS
(Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 2016-12-16) Selleswari D; Meena P; Mangalaraj D; Sivakumar N; Jeevitha G
different technological applications of metal oxide thin films are mostly ruled by their properties [1]. Among the different metal oxides,thin films of CuO (Cuprous oxide) have attracted much attention as promising materials for many industrial applications [2-4]. CuO, which has a monoclinic crystal structure, is an important p-type semiconductor with an optical band gap ranging from 1.2 to 1.6 eV and a high absorption coefficient. It is effectively employed in catalysts, gas sensors, solar cells, lithium ion batteries, and superconductors. The structural morphology and particle size play important roles in determining the physicochemical properties of CuO. The present study deals with the preparation of pure and CTAB coated CuO nanomaterials by using the hydrothermal route and the study of their structural, physical, and optical properties. The XRD patterns of both pure and CTAB coated CuO nanomaterials are found to exhibit a well crystallized monoclinic structure. The SEM image gives direct information about the size and typical morphologies of the pure and CTAB coated CuO. The optical band gap values of the pure and CTAB CuO nanoparticles are estimated from the UV studies. Fourier transform infrared (FTIR) spectra confirm the chemical structure and also help to identify the major functional groups existing in the pure and CTAB CuO particles. The CuO samples prepared with CTAB show a better performance compared to the pure CuO samples.
SYNTHESIS AND CHARACTERIZATION OF CUO - SNO2 COMPOSITE THIN FILMS BY SPRAY PYROLYSIS METHOD
(PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) Selleswari D; Meena P; Mangalaraj D
Copper acetate and Tin dihydrate were used as a precursor to prepare CuO-SnO2 thin films. Composite films of different ratios were prepared by spray pyrolysis method. The prepared films were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray analysis (EDX) and Optical absorption spectroscopy. The grain size was calculated from different peaks is 27 to 54 nm shows nano structured thin films. EDX analysis confirms the composition of deposited thin film. The band gap of the composite thin films obtained from the optical absorption spectra is to be in the range of 2.98 to 3.67 eV