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Articles by B.G. Jeyaprakash
Total Records ( 11 ) for B.G. Jeyaprakash
  T. Karthikeyan , B.G. Jeyaprakash and John Bosco Balaguru Rayappan
  Today, there is an increasing demand for sensors that includes home-security, military, industrial and clinical diagnosis. In the past, Fiber Optic based Sensor (FOS) has made profound impact due to its simple, room temperature detection and large range of detection species. In the present work, a simple optical fiber for sensing ethanol vapour was developed using borosilicate glass rod as core and Successive Ionic Layer Adsorption and Reaction (SILAR) deposited zinc oxide (ZnO) thin film as cladding materials. Structural studies carried out using X-ray Diffraction (XRD) method indicates, the ZnO film was polycrystalline hexagonal structure in nature with preferential orientation along (002) plane. Grain size obtained through line broadening technique was found to be 25 nm. The two ends of the fabricated fiber were connected to a diode laser source of 850 nm and optical power meter of 0.01 dBm accuracy as detector. The transmitted light intensity of the fabricated fiber found to changes in ethanol vapour atmosphere. The response and recovery time towards ethanol at room temperature as a function of cladding thickness and length were analysed and reported.
  C.H.S.S. Pavan Kumar , R. John Bosco Balaguru and B.G. Jeyaprakash
  Cerium oxide is a multi-application material due to its wide band gap (3.6 eV) and lattice parameter matching similar to silicon. Its high dielectric constant, ionic conductivity and ferromagnetic nature makes to utilize as insulating layer in transistors, solid oxide fuel cells and spintronic application, respectively. In the present study, thin films of cerium oxide and Mn doped cerium oxide films have been prepared on glass substrates by homemade spray pyrolysis unit. X-ray diffraction pattern analysis shows peak broadening upon doping and indicates a decrease in grain size. The influence of Mn doping on electrical properties was also analyzed and reported.
  Usha Nandini Devi , John Bosco Balaguru Rayappan and B.G. Jeyaprakash
  Nanostructured ceria/polyaniline core shell particles were synthesized via polymerization of aniline monomers with the cerium oxide nanoparticles. Cerium oxide nanoparticles were prepared by hydroxide-medicated treatment and the shell was formed by polymerization of aniline hydrochloride with ammonium peroxydisulphate. Structural and optical characteristics of the prepared nanocomposites were studied separately for cerium oxide, polyaniline and core-shell ceria-polyaniline. The UV-Vis absorption spectra of the CeO2-PANI confirmed the formation of the core-shell nanostructure. The optical properties of nanocomposites obtained from this method were analyzed as a function of preparation condition and the same has been reported.
  M.S. Inpasalini , R. Gayathri Devi , D. Balamurugan , B.G. Jeyaprakash and John Bosco Balaguru Rayappan
  In the present study, thin film heterojunction based on n-CdO/p-NiO was fabricated on glass substrate by home built spray pyrolysis technique under optimized condition. Cadmium acetate dihydrate and Nickel chloride were used as precursors. Structural, surface morphology, optical and photovoltaic properties were analyzed and reported.
  M. Vigneshwaran , R. Chandiramouli , B.G. Jeyaprakash and D. Balamurugan
  Cadmium oxide is the very crucial material in the field of solar cells, optoelectronic devices, flat panel displays due to its high transparency and narrow band gap. In this study, Mg doped CdO thin films were prepared using the home made spray pyrolysis unit and its structural and electrical properties were studied. The XRD results show that the grain size decreases upon increasing the dopant concentration from its broadened peak. Atomic Force Microscopy (AFM) analysis indicates that the roughness of the surface decreases upon increasing Mg concentration. The activation energy, I-V characteristics were studied using Four probe method. The results were analyzed for three different concentration of Mg doped CdO films and are reported.
  D. Mahesh Reddy , B.G. Jeyaprakash and R. John Bosco Balaguru
  Recently nanostructured based metal oxide thin films were preferred for thermoelectric applications due to its lower thermal conductivity than in bulk form. Cadmium oxide in bulk form has lower thermal conductivity and much work on thermoelectric studies in thin film is not reported. Hence in the present study, undoped, Zn and Mn doped CdO thin films were prepared on glass substrate using homemade spray pyrolysis technique and its structural, electrical, surface morphology and thermoelectric properties were analyzed and reported.
  S. Affreen , D. Balamurugan and B.G. Jeyaprakash
  Thin film of spinel ferrite has wide range of application such as magnetic sensor, reading head for magnetic recording media, switch mode power supplies, deflection yoke rings and spintronics devices. These wide applications are due to its high permeability, large resistivity, relatively high magnetization and low coercivity. In the present study spinel ZnFe2O4 with good adhesion on glass substrate have been prepared using home built spray pyrolysis unit from mixed zinc and iron nitrates of 1:2 M aqueous solutions. Photograph of the prepared film shows that as film thickness increases, the color of the film changes from golden yellow to red-brown and is due to increase in grain size. X-ray line broadening technique was adopted to obtain grain size and microstrain. It was observed that the surface morphology and optical transmittance strongly depends on film thickness. Band gap of the film varies from 2.08 to 2.70 eV as film thickness decreases. The effect of film thickness on crystalline nature, surface morphology and optical properties were analyzed and reported.
  D. Balamurugan , B.G. Jeyaprakash and R. Chandiramouli
  ZnS thin films on glass substrate have been prepared by home built spray pyrolysis technique at 220, 250 and 280°C. Aqueous solution of 50 mL containing zinc acetate dihydrate and thiourea salts of 1:1 M is sprayed as fine mist at a pressure of 2 kg cm-2 with flow rate of 3 mL min-1 on preheated glass substrate. Film obtained at 220°C found to be amorphous and polycrystalline at 250 and 280°C with preferential orientation along (111) plane. X-ray line broadening technique is utilized to determine the grain size and microstrain of the ZnS film. Compositional studies indicate the presence of oxygen for the film prepared at 250°C. The effect of substrate temperature on crystalline structure, surface morphology and composition were analyzed and reported.
  S. Amutha , R. Chandiramouli and B.G. Jeyaprakash
  A great deal of research efforts was directed towards investigating the physical properties of thin film in order to improve the performance of device and for finding new applications. In this study, undoped cadmium oxide and manganese doped cadmium oxide (CdO) film were prepared using home built spray pyrolysis technique. Structural properties of undoped and Mn (manganese) doped CdO films shows polycrystalline FCC (Face Centered Cubic) crystal in nature with preferential orientation along (111) plane. X-ray peak line broadening technique was adopted to estimate grain size and strain. Film resistivity was obtained using linear four probe method. From the resistivity verses temperature plot, activation energy was estimated. It was observed that the activation energy decreases as Mn concentration in the precursor solution increases. The effect of Mn level on microstructural parameters like grain size and microstrain as well as activation energy were analyzed and reported.
  Aishwarya Viswanath , N. Nirmmala Devi , B.G. Jeyaprakash and R. Chandiramouli
  A highly transparent and conducting metal oxide (TCO) film is a compromise between low resistivity and high transmittance. In the present study, fluorine doped cadmium oxide thin films (F:CdO) as TCO film were prepared with low sheet resistance (4 Ω cm-2) and high optical transmittance (85%). F:CdO films were deposited using spray pyrolysis method with precursor concentration of 0.1 M Cadmium acetate doped with 0.002, 0.004 and 0.006 M concentration of ammonium fluoride. Substrate temperature was fixed at 250°C with precursor solution flow rate of 3 mL min-1. The structural, morphological, optical and electrical characterization of F:CdO were investigated using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-visible spectrometer and four probe method, respectively. The structural studies confirms the polycrystalline nature of film with preferential orientation along (111) plane. Morphological studies show the presence of closely packed spherical grains. The band gap obtained by optical studies was found to vary between 2.5-2.8 eV for increasing fluorine concentration. The transparence of the film is found to be high in the range of 85%. Variation of electrical and optical parameters as a function of fluorine concentration were analyzed and reported.
  A.K. Govindaraj , J.B.B. Rayappan and B.G. Jeyaprakash
  Fabrication of ZnO thin film on glass substrate was patterned using spray pyrolysis technique by spraying 0.05 M of zinc acetate aqueous solution as a fine mist at 250°C and again, Polymethyl methacrylate (PMMA) thin film coating on ZnO thin films was coated using spin coating by dissolving PMMA in 20 mL metacresol. The structural, morphological and optical studies were carried out using XRD, FE-SEM and UV-Vis spectrophotometer, respectively. These explain the effect of PMMA on the surface.
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