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Title: Evidence of interfacial charge trapping mechanism in polyaniline/reduced graphene oxide nanocomposites

Relaxation mechanisms in polyaniline (PANI)/Reduced Graphene Oxide (RGO) nanocomposites are investigated using broad band dielectric spectroscopy. The multilayered nanostructural features of the composites and the intimate interactions between PANI and RGO are evidenced by field emission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Increasing the RGO fraction in the composites results in a relaxation process observed at a frequency of ca. 5 kHz. This mechanism is associated with an electrical charge trapping phenomenon occurring at the PANI/RGO interfaces. The dielectric relaxation processes are interpreted according to the Sillars approach and the results are consistent with the presence of conducting prolate spheroids (RGO) embedded into a polymeric matrix (PANI). Dielectric permittivity data are analyzed within the framework of the Kohlrausch-William-Watts model, evidencing a Debye-like relaxation process.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. University of Lille, Sciences & Technologies, Unité Matériaux et Transformations (UMET), UMR CNRS 8207, U.F.R. de Physique, P5, 59655 Villeneuve d'Ascq Cedex (France)
  2. (France)
  3. Physics Department, Solid State Physics Section, University of Athens, Panepistimiopolis, GR15784 Zografos, Athens (Greece)
  4. Science Division, University of Science and Arts of Oklahoma, Chickasha, Oklahoma 73018 (United States)
Publication Date:
OSTI Identifier:
22489060
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIELECTRIC MATERIALS; FIELD EMISSION; GRAPHENE; NANOCOMPOSITES; NANOSTRUCTURES; OXIDES; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SPHEROIDS; TRANSMISSION ELECTRON MICROSCOPY