Chemical synthesis, characterization, and direct‐current conductivity studies of polypyrrole/γ‐Fe2O3 composites

The in situ polymerization of pyrrole was carried out in the presence of γ-Fe2O3 to synthesize polypyrrole/γ-Fe2O3 composites by a chemical oxidation method. The polypyrrole/γ-Fe2O3 composites were synthesized with various compositions, including 10, 20, 30, 40, and 50 wt % γ-Fe2O3 in pyrrole. The polypyrrole/γ-Fe2O3 composites were characterized with X-ray diffractometry and infrared spectroscopy. The surface morphology of these composites was studied with scanning electron microscopy. The direct-current conductivity was studied from 40 to 200°C. The dimensions of the γ-Fe2O3 particles in the matrix had a greater influence on the conductivity values. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2797–2801, 2007

[1]  Alan Hooper,et al.  Conducting polymer gas sensors , 1986 .

[2]  S. Sakkopoulos,et al.  Localized and long-distance charge hopping in fresh and thermally aged conductive copolymers of polypyrrole and polyaniline studied by combined TSDC and dc conductivity , 2002 .

[3]  S. Khasim,et al.  Synthesis, characterization and low frequency a.c. conduction of polyaniline/fly ash composites , 2003 .

[4]  S. Sakkopoulos,et al.  Electrical conductivity and TSDC study of the thermal aging in conductive polypyrrole/polyaniline blends , 2002 .

[5]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[6]  R. Tandon,et al.  Low‐frequency ac conduction in lightly doped polypyrrole films , 1991 .

[7]  B. Scrosati,et al.  A new electrode for a poly(pyrrole)-based rechargeable battery , 1992 .

[8]  A. Shimizu,et al.  Rechargeable Lithium Batteries Using Polypyrrole–Poly(styrenesulfonate) Composite as the Cathode-Active Material , 1988 .

[9]  J. Reynolds,et al.  Polypyrrole as a solid electrolyte for tantalum capacitors , 1996 .

[10]  N. W Grimes,et al.  The spinels: versatile materials , 1975 .

[11]  Christine Kranz,et al.  Conducting polymer-based amperometric enzyme electrodes. Towards the development of miniaturized reagentless biosensors , 1993 .

[12]  W. Schuhmann.  Functionalized polypyrrole. A new material for the construction of biosensors , 1991 .

[13]  K. Honda,et al.  A novel type of polymer battery using a polypyrrole-polyanion composite anode , 1987 .

[14]  A. Heeger,et al.  Visible light emission from semiconducting polymer diodes , 1991 .

[15]  Ş. Süzer,et al.  A conducting composite of polypyrrole II. As a gas sensor , 1995 .

[16]  P. Bartlett,et al.  Conducting polymer gas sensors part I: fabrication and characterization , 1989 .

[17]  G. Sotzing,et al.  Electrochromic conducting polymers via electrochemical polymerization of bis(2-(3,4-ethylenedioxy)thienyl) monomers , 1996 .

[18]  Electron Hopping Conduction in the Soliton Model of Polyacetylene , 1981 .

[19]  Shimshon Gottesfeld,et al.  A study of the electrochemical properties of conducting polymers for application in electrochemical capacitors , 1994 .

[20]  J. A. Logan,et al.  Electrochemistry of conducting polypyrrole films , 1981 .