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Structural and thermoelectric properties of copper sulphide powders

Journal of Semiconductors 2018年第12期39卷 1-5页

作者： A.Narjis A.Outzourhit A.Aberkouks M.El Hasnaoui L.Nkhaili Nanomaterials for Energy and Environment laboratory Physics Department Faculty of Sciences Semlalia Cadi Ayyad University Laboratoire de chimie de Coordination et de Catalyse Département de Chimie Faculté des Sciences Semlalia lastid laboratory Physics Department Faculty of Sciences Ibn Tofail University

Over the past few years, Cu-based materials have been intensively studied focusing on their structural and thermoelectric properties. In this work, copper sulphide powders were synthesized by the sol-gel method. The chemical composition and the morphological properties of the obtained samples were analyzed by X-ray diffraction, differential thermal analysis, and scanning electron microscopy. It is shown that the decomposition from one phase to another can be obtained by annealing. The electrical resistivity and the crystallite size were found to be strongly affected by the phase transition. Thermoelectric analyses showed that the digenite phase exhibits the highest power factor at room temperature. The Seebeck coefficient of the compound Cu1.8S shows a pronounced peak at the γ-β transition temperature. This behavior was statistically explained in terms of a dramatic increase in the disorder in the atoms-carriers ensemble.

关键词： copper sulphide thermoelectricity annealing temperature phase transition

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Electric Modulus Analysis of Carbon Black/Copolymer Composite Materials

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Materials Sciences and Applications 2011年第10期2卷 1421-1426页

作者： Mohamed El Hasnaoui Manuel Pedro Fernanades Graca Mohammed Essaid Achour Luis Cadillon Costa Laboratoire lastid Departement de PhysiqueFaculte des SciencesUniversite Ibn TofailKenitraMorocco I3N and Physics Department University of AveiroAveiroPortugal

We have investigated the electrical properties of carbon black (CB) loaded in ethylene butylacrylate copolymer composite (EBA) in the frequency range between 102 and 104 Hz and temperature range between 153 and 353 K. The frequency dependence of electrical data that have been analyzed in two frameworks: the electrical modulus formalism with the Kohlrausch-Williams-Watts stretched exponential function (KWW) and the electrical conductivity by using the Jonscher’s power law in the frequency domain. The stretching exponent βKWW and n are found to be temperature independent for all CB fractions and to be decreased when the CB volume concentrations loaded in copolymer matrix increases. It is found that the activation energy obtained by the modulus method is in good agreement with that obtained by the DC conductivity in the power law which is independent on the CB contents that exist in the copolymer matrix, suggesting that these particles do not interact significantly with the chain segments of the macromolecules in the EBA copolymer.

关键词： Electrical Modulus Polymer Matrix Nanocomposites Conducting Particles

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