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Title: Electrical and thermal properties of graphite/polyaniline composites

Abstract

A composite of a carbon allotrope (graphite) and an inherently conducting polymer, polyaniline (PANI), has been prepared that exhibits an electrical conductivity greater than either of the two components. An almost 2-fold increase in the bulk conductivity occurs when only a small mass fraction of polyaniline exists in the composite (91% graphite/ 9% polyaniline, by mass). This increase in dc electrical conductivity is curious since in most cases a composite material will exhibit a conductivity somewhere between the two individual components, unless a modification to the electronic nature of the material occurs. In order to elucidate the fundamental electrical properties of the composite we have performed variable temperature conductivity measurements to better understand the nature of conduction in these materials. The results from these studies suggest a change in the mechanism of conduction as the amount of polyaniline is increased in the composite. Along with superior electrical properties, the composites exhibit an increase in thermal stability as compared to the graphite. - Graphical abstract: (Left) Room temperature electrical conductivity of G-PANI composites at different mass ratios. (Right) Electrical conductivity of G-PANI composites at temperatures from 5 K to 300 K. Highlights: Black-Right-Pointing-Pointer Composites of graphite and polyaniline have been synthesizedmore » with unique electrical and thermal properties. Black-Right-Pointing-Pointer Certain G-PANI composites are more conductive and more thermally stable than graphite alone. Black-Right-Pointing-Pointer G-PANI composites exhibit a larger conductivity ratio with respect to temperature than graphite alone.« less

Authors:
;  [1]
  1. Department of Chemistry, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, AR 72204 (United States)
Publication Date:
OSTI Identifier:
22149947
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 196; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMPOSITE MATERIALS; ELECTRIC CONDUCTIVITY; GRAPHITE; POLYMERS; THERMAL GRAVIMETRIC ANALYSIS; THERMODYNAMIC PROPERTIES; X-RAY DIFFRACTION

Citation Formats

Bourdo, Shawn E., E-mail: sxbourdo@ualr.edu, Warford, Brock A., and Viswanathan, Tito. Electrical and thermal properties of graphite/polyaniline composites. United States: N. p., 2012. Web. doi:10.1016/J.JSSC.2012.06.038.
Bourdo, Shawn E., E-mail: sxbourdo@ualr.edu, Warford, Brock A., & Viswanathan, Tito. Electrical and thermal properties of graphite/polyaniline composites. United States. doi:10.1016/J.JSSC.2012.06.038.
Bourdo, Shawn E., E-mail: sxbourdo@ualr.edu, Warford, Brock A., and Viswanathan, Tito. Sat . "Electrical and thermal properties of graphite/polyaniline composites". United States. doi:10.1016/J.JSSC.2012.06.038.
@article{osti_22149947,
title = {Electrical and thermal properties of graphite/polyaniline composites},
author = {Bourdo, Shawn E., E-mail: sxbourdo@ualr.edu and Warford, Brock A. and Viswanathan, Tito},
abstractNote = {A composite of a carbon allotrope (graphite) and an inherently conducting polymer, polyaniline (PANI), has been prepared that exhibits an electrical conductivity greater than either of the two components. An almost 2-fold increase in the bulk conductivity occurs when only a small mass fraction of polyaniline exists in the composite (91% graphite/ 9% polyaniline, by mass). This increase in dc electrical conductivity is curious since in most cases a composite material will exhibit a conductivity somewhere between the two individual components, unless a modification to the electronic nature of the material occurs. In order to elucidate the fundamental electrical properties of the composite we have performed variable temperature conductivity measurements to better understand the nature of conduction in these materials. The results from these studies suggest a change in the mechanism of conduction as the amount of polyaniline is increased in the composite. Along with superior electrical properties, the composites exhibit an increase in thermal stability as compared to the graphite. - Graphical abstract: (Left) Room temperature electrical conductivity of G-PANI composites at different mass ratios. (Right) Electrical conductivity of G-PANI composites at temperatures from 5 K to 300 K. Highlights: Black-Right-Pointing-Pointer Composites of graphite and polyaniline have been synthesized with unique electrical and thermal properties. Black-Right-Pointing-Pointer Certain G-PANI composites are more conductive and more thermally stable than graphite alone. Black-Right-Pointing-Pointer G-PANI composites exhibit a larger conductivity ratio with respect to temperature than graphite alone.},
doi = {10.1016/J.JSSC.2012.06.038},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 196,
place = {United States},
year = {2012},
month = {12}
}