Sumanta Sahoo

Publications (14) View all

• Article: In Situ Synthesis of Graphene/Amine-Modified Graphene, Polypyrrole Composites in Presence of SrTiO3 for Supercapacitor Applications

  Debasis Ghosh, Soumen Giri, Sumanta Sahoo, C. K. Das
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  ABSTRACT: Composites based on both unmodified and amine-modified graphene were successfully prepared via in situ oxidative polymeri-zation of pyrrole in presence of SrTiO3. To characterize the graphene/amine-modified graphene-polypyrrole-SrTiO3 composite electrodes, cyclic voltammetry test for measuring specific capaci-tance, cyclic charge discharge test and an ac impedance test were executed. The composite with unmodified graphene showed better specific capacitance but a little lower cyclability compared to that of modified graphene composite. The presence of SrTiO3 ensures the better thermal stability of the composites compared to that of simple graphene–polypyrrole composite
  Polymer-Plastics Technology and Engineering 02/2013; 52(3):213-215. · 1.28 Impact Factor
• Article: Graphene/Polypyrrole nanofiber nanocomposite as electrode material for electrochemical supercapacitor

  Sumanta Sahoo, Saptarshi Dhibar, Goutam Hatui, Pallab Bhattacharya, Chapal Kumar Das
  Polymer 02/2013; 54:1033-1042. · 3.44 Impact Factor
• Article: Microwave absorption behaviour of MWCNT basednanocomposites in X-band region

  P. Bhattacharya, S. Sahoo, C. K. Das
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  ABSTRACT: Multiwall carbon nanotube (MWCNT) based nanocomposites were prepared by atwo-step process. Firstly, titanium dioxide (TiO2) coated MWCNT was prepared via sol-gel technique. In the second step the acidmodified MWCNTs were dispersed in the thermoplastic polyurethane matrix by solution blending process. Characterizations of the nanocomposites were done by X-ray diffraction analysis, X-ray photoelectron spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy and Energy-dispersive X-rayspectroscopy. Microwave absorption studies of the nanocomposites were carried out in X-band region. The microwave absorption result was discussed with the help of complex permittivity and permeability of the prepared radar absorbing material (RAM). The result showed superior microwave absorption property of the composite containing both TiO2 coated MWCNT and magnetite (Fe3O4). This result is due to the effective absorption of both electrical and magnetic components of the microwave. RAM-MW, RAM-Ti, RAM-Ti@MW and RAMTi@ MW/Feshowed the maximum reflection loss of –16.03 dB at 10.99 GHz, –8.4 dB at 12.4 GHz, –36.44 dB at 12.05 GHz and –42.53 dB at 10.98 GHz respectively. Incorporation of MWCNT enhanced the thermal stability of the composite which has been confirmed by thermogravimetric analysis.
  eXPRESS Polymer Letters 01/2013; 7(3):212-223. · 1.77 Impact Factor
• Article: Facile synthesis of polypyrrole nanofiber and its enhanced electrochemical performances in different electrolytes

  S Sahoo, S Dhibar, CK Das
  eXPRESS Polymer Letters 07/2012; 6(12):965-974. · 1.77 Impact Factor
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  Article: Synthesis and Electrochemical Characterization of Modified Graphene/Polypyrrole Nanocomposites

  Sumanta Sahoo, G C Nayak, Chapal Kumar Das
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  ABSTRACT: Nanocomposites based on both modified/unmodified graphene and polypyrrole, were investigated as electrode materials for supercapacitor application. All the nanocomposites were prepared by in-situ oxidative polymerization method using ammonium persulfate as oxidant. The amine functionalization of Graphene was confirmed by FTIR and X-ray Photo Electron Spectroscopy (XPS). Field Emission Scanning Electron Microscopy (FESEM) and High Resolution Transmission Electron Microscopy (HRTEM) analysis were performed to study the morphology of the nanocomposites. The maximum capacitance value was found as 240 F/g for unmo-dified graphene based composite. Though the capacitance value was found to be lower for modified graphene based composite, the cyclic stability was found to be higher as compared to unmodified graphene/polypyrrole nanocomposite.
  Macromolecular Symposia 06/2012; 315(1):177-187.