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Shinde S.K.,Shivaji University | Dubal D.P.,Shivaji University | Ghodake G.S.,Dongguk University | Lee D.S.,Kyungpook National University | And 3 more authors.
Materials Letters | Year: 2014

Cd1-XFeXSe thin films were electrodeposited onto fluorine doped tin oxide coated conducting glass (FTO) and stainless steel (SS) substrates at various bath compositions with X=0.1 to 0.5 in an aqueous electrolytic bath containing CdSO4, FeSO4 and SeO 2. The effects of different compositions on physico-chemical properties of Cd1-XFeXSe thin films have been systematically investigated. The X-ray diffraction (XRD) analysis reveals the polycrystalline in nature of Cd1-XFeXS thin films. Field emission scanning electron microscopy (FE-SEM) micrographs shows the variation in the nanostructure with varying compositions. The Cd1-XFeXSe thin films exhibited the water contact angles in hydrophilic range. Optical absorption measurements are used to estimate the band gap value of Cd1-XFeXSe thin films deposited at various bath compositions. The dramatic changes in surface morphology, as a consequence of different composition of Fe in CdSe matrix, significantly alter the conversion efficiency of Cd1-XFe XSe films. © 2014 Elsevier B.V. All rights reserved.

Thombare J.V.,Shivaji University | Rath M.C.,Radiation and Photochemistry Division | Han S.H.,Hanyang University | Fulari V.J.,Shivaji University
Journal of Semiconductors | Year: 2013

Polypyrrole (PPy) thin films were deposited on stainless steel and ITO coated glass substrate at a constant deposition potential of 0.8 V versus saturated calomel electrode (SCE) by using the electrochemical polymerization method. The PPy thin films were deposited at room temperature at various monomer concentrations ranging from 0.1 M to 0.3 M pyrrole. The structural and optical properties of the polypyrrole thin films were investigated using an X-ray diffractometer (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), and ultraviolet - visible (UV - vis) spectroscopy. The XRD results show that polypyrrole thin films have a semi crystalline structure. Higher monomer concentration results in a slight increase of crystallinity. The polypyrrole thin films deposited at higher monomer concentration exhibit high visible absorbance. The refractive indexes of the polypyrrole thin films are found to be in the range of 1 to 1.3 and vary with monomer concentration as well as wavelength. The extinction coefficient decreases slightly with monomer concentration. The electrochemically synthesized polypyrrole thin film shows optical band gap energy of 2.14 eV. © 2013 Chinese Institute of Electronics.

Lohar G.M.,Shivaji University | Jadhav S.T.,Shivaji University | Takale M.V.,Shivaji University | Patil R.A.,National Dong Hwa University | And 3 more authors.
Journal of Colloid and Interface Science | Year: 2015

The Fe2+ doped ZnSe nanorods are synthesized using simple potentiostatic mode of electrodeposition on the ITO substrate. In order to study the doping effect of Fe2+ in ZnSe, varied the doing percent such as 0.5%, 1%, 1.5%. These films are characterized for structural, compositional, morphological, optical and electrochemical properties using the X-ray diffraction study (XRD), X-ray photoelectron spectroscopy, field emission scanning electron microscopy, UV-vis spectroscopy and electrochemical spectroscopy. Along with these Raman spectroscopy and photoluminescence spectroscopy have been studied for understanding the characteristics vibrations of ZnSe and luminescence of ZnSe nanorods. FE-SEM shows the nanorods like morphology. Photoelectrochemical cell performance studied using the J-V measurement and it shows the maximum efficiency at 1% Fe2+ doped ZnSe nanorods. The observed maximum efficiency of Fe2+ doped ZnSe nanorods is 0.32%. © 2015.

Thombare J.V.,Shivaji University | Rath M.C.,Radiation and Photochemistry Division | Han S.H.,Hanyang University | Fulari V.J.,Shivaji University
Journal of Semiconductors | Year: 2013

The optical properties of polypyrrole (Ppy) thin films upon 2 MeV electron beam irradiation changes with different doses. The induced changes in the optical properties for Ppy thin films were studied in the visible range 300 to 800 nm at room temperature. The optical band gap of the pristine Ppy was found to be 2.19 eV and it decreases up to 1.97 eV for a 50 kGy dose of 2 MeV electron beam. The refractive index dispersion of the samples obeys the single oscillator model. The obtained results suggest that electron beam irradiation changes the optical parameters of Ppy thin films. © 2013 Chinese Institute of Electronics.

Chougale U.M.,Shivaji University | Han S.H.,Hanyang University | Rath M.C.,Radiation and Photochemistry Division | Fular V.J.,Shivaji University
Materials Physics and Mechanics | Year: 2013

Herein we report electrochemical synthesis of the silver selenide (Ag 2Se) thin films using simple and economical electrodeposition method in potentiostatic mode at room temperature (~ 27 °C). Growth of rhombohedral Ag2Se nanocrystals having size 63 to 75 nm were observed in (201) direction. Band gap energy of Ag2Se decreased from 1.3 eV to 1.1 eV and contact angle increases from 58° to 74° with increase in bath concentration from 3 to 5 mM. A possible mechanism for the growth and stress of compact granular Ag2Se nanocrystals is discussed with DEHI technique. Compared with previous methods, present method shows simple and easiest way to synthesize nanosized Ag2Se particles in one step. © 2013, Institute of Problems of Mechanical Engineering.

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