Effects of the action of hydrogen peroxide on the electrical properties of polyaniline-aluminium composites

• Published in: Journal of physics. D, Applied physics Vol. 44; no. 31; p. 315405
• Main Authors: GMATI, Fethi, FATTOUM, Arbi, MANAII, Aymen, ABDELLATIF BELHADJ MOHAMED
• Format: Journal Article
• Language: English
• Published: Bristol Institute of Physics 10.08.2011
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Electronic transport in condensed matter; Exact sciences and technology; Mobility edges ; hopping transport; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Temperature dependence; Scanning electron microscopy; Fluctuations; Electrical conductivity; Experimental data; Hydrogen peroxide; Electrical properties; Tunnel effect; Aluminium; Infrared spectra; Hopping conduction; Temperature coefficient; Ultraviolet radiation; Composite materials; Direct current; Absorption spectra; Localization
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/44/31/315405

The effects of the action of hydrogen peroxide (H 2 O 2 ) as an oxidizing agent on the electrical properties of polyaniline-aluminium (PANI-Al) composites are studied. Direct current (dc) electrical conductivity is investigated in the temperature range 303–453 K. A decrease in the conductivity with attack time is observed. The results are compatible with UV–visible and infrared absorption measurements and scanning electron microscopy analysis. The experimental data show a transition from a negative temperature coefficient of resistivity (TCR) to a positive TCR. This transition becomes more pronounced when the attack time increases. Depending on the H 2 O 2 attack time, we found that the dc conductivity of the composites is described by two distinct models: the first is a series combination between the fluctuation-induced tunnelling (FIT) model with a metallic transport model, the second is a combination between Mott's three-dimensional variable range hopping with an intrinsic metallic model. The different FIT and Mott parameters are evaluated. The change in the conduction mechanism is attributed to the disorder and the localization effect caused by the action of H 2 O 2 on the PANI-Al composite.