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Articles by K. Jeyadheepan
Total Records ( 5 ) for K. Jeyadheepan
  V. Manoj , M. Karthika , V.S.R. Praveen Kumar , S. Boomadevi , K. Jeyadheepan , R.K. Karn , R. John Bosco Balaguru and S.K. Pandiyan
  A new approach has been proposed to synthesis pure ZnO nanoparticles from zinc nitrate hexa-hydrate precursor and sodium carboxymethyl cellulose capping agent. The resulting nanoparticles were characterized by X-ray Diffraction (XRD), Fourier Transform Infra-red (FTIR) spectroscopy, photoluminescence spectroscopy and Field Emission Scanning Electron Microscopy (FESEM). The XRD results showed that particle size is in the range of few nanometers with hexagonal wurtzite structure. Photoluminescence and FESEM results suggested that the adopted method can be successfully utilized for the preparation of size controlled nanocrystalline ZnO powder.
  C. Ravi Dhas , Dinu Alexander , A. Jennifer Christy , K. Jeyadheepan , A. Moses Ezhil Raj and C. Sanjeevi Raja
  The biomedical, chemical, drug and food industries have great demand of an alcohol sensor with high sensitivity and selectivity which can operate at low temperature. In this study, CuO thin films were deposited on well cleaned glass substrates by spray pyrolysis technique for 0.1, 0.2 and 0.3 molar concentrations of copper chloride precursor solutions and at a substrate temperature of 300°C and at an air pressure of 0.4 kg cm-2. X-ray diffraction patterns of the prepared films revealed the formation of CuO thin films having monoclinic structure with a grain size ranging from 35 to 54 nm. The microstrain and dislocation densities are found to decrease with increase in molar concentration. The surface morphology and the elemental composition of the deposited samples were analyzed using SEM and EDAX. The change in resistivity of the films was studied with respect to the change in temperature using two probe method. From Laser Raman spectral studies, the characteristic Raman peaks of the prepared samples were observed. The ethanol gas sensing properties of the prepared films were studied for 100 and 200 ppm ethanol vapour.
  M. Karthika , V. Manoj , S. Boomadevi , K. Jeyadheepan , R.K. Karn , R. John Bosco Balaguru and S.K. Pandiyan
  Nano crystalline zinc oxide (ZnO) films were fabricated by dip coating of ZnO hydrogel. Zinc nitrate hexahydrate and sodium carboxymethyl cellulose were used to prepare the hydrogel. The dip coated samples were annealed at 400°C to obtain the high quality thin films. The films were characterized by X-Ray Diffraction (XRD) which indicated that the films are single phase with the wurtzite structure. Surface morphology of the nanoparticles were studied by Field Emission Secondary Electron Microscopy (FESEM) and optical properties were studied by photo luminescence spectroscopy. Further, gas sensing behaviour were checked for the coated films for ammonia and acetaldehyde vapours at room temperature.
  P. Karthick , Divya Vijayanarayanan , S. Suja , M. Sridharan and K. Jeyadheepan
  Transparent and conductive fluorine doped tin oxide thin films (FTO) were deposited on to thoroughly cleaned glass substrates by nebulized spray pyrolysis technique using di-hydrated tin (II) chloride (SnCl2.2H2O) and ammonium fluoride (NH4F) as the source of tin (Sn) and fluorine (F), respectively. The fluorine concentration was varied from 0.005-0.04 M in the steps of 0.05. The substrate temperature was constantly maintained at 350°C for all depositions. The influence of dopant concentration on the optoelectronic properties of FTO thin films was investigated using X-Ray Diffraction (XRD) analysis, Scanning Electron Micrographs (SEM), Energy Dispersive Analysis of X-rays (EDAX) spectra, optical analysis and electrical measurements.
  M. Krishna Kumar , P. Deepak Raj , Albert Serra Torrent , K. Jeyadheepan and M. Sridharan
  Zinc oxide (ZnO) films were deposited onto glass substrates using reactive direct current magnetron sputtering technique by varying the substrate bias voltage (floating potential and -50 V) and retaining other parameters, viz., deposition time, substrate temperature, argon and oxygen flow, etc., as constant. The deposited ZnO films were doped with aluminium (Al) using thermal evaporation technique and subsequently annealed at 150°C for 2 h in ambient air. Pure and Al doped films were then investigated by X-ray diffraction (XRD), UV-Visible spectroscopy, Field-Emission Scanning Electron Microscopy (FE-SEM) and four probe method for their structural, optical, morphological and electrical properties, respectively. The films were polycrystalline in nature with hexagonal wurtzite structure. Increase in the grain size value was observed for the films deposited at -50 V substrate bias voltage as well as for the films doped with Al which in turn reduced the band gap value of the films. The band gap values of the films varied between 3.34 and 3.00 eV with respect to substrate bias voltage and Al doping. The variations in the properties of the films were correlated to the change in the micro-structural parameters due to the change in the ion energy variation influenced by the variation of substrate bias voltages.
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