Topic
Conductive polymer
About: Conductive polymer is a research topic. Over the lifetime, 21817 publications have been published within this topic receiving 692491 citations. The topic is also known as: intrinsically conducting polymer & ICP.
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TL;DR: In this article, the secondary dopant diethylene glycol (DEG) was added to the conducting polymer poly(3,4-ethylenedioxythiophene)− poly(styrenesulfonate) (PEDOT−PSS) to improve its electrical properties.
Abstract: The development of printed and flexible (opto)electronics requires specific materials for the device's electrodes Those materials must satisfy a combination of properties They must be electrically conducting, transparent, printable, and flexible The conducting polymer poly(3,4-ethylenedioxythiophene)− poly(styrenesulfonate) (PEDOT−PSS) is known as a promising candidate Its conductivity can be increased by 3 orders of magnitude by the secondary dopant diethylene glycol (DEG) This “secondary doping” phenomenon is clarified in a combined photoelectron spectroscopy and scanning probe microscopy investigation PEDOT−PSS appears to form a three-dimensional conducting network explaining the improvement of its electrical property upon addition of DEG Polymer light emitting diodes are successfully fabricated using the transparent plastic PEDOT−PSS electrodes instead of the traditionally used indium tin oxide
824 citations
TL;DR: In this article, the effects of secondary doping on polyaniline and its derivatives are shown to be based primarily on a change in molecular conformation of the polymer from "compact coil" to "expanded coil".
823 citations
TL;DR: The review covers main applications of conducting polymers in chemical sensors and biosensors, such as pH sensitivity, sensitivity to inorganic ions and organic molecules as well as sensitivity to gases, and induced receptor properties.
819 citations
TL;DR: With polyaniline samples prepared using self-stabilized dispersion polymerization, it is found that for samples having room-temperature conductivities in excess of 1,000 S cm-1, the resistivity decreases monotonically as the temperature is lowered down to 5 K, and that the infrared spectra are characteristic of the conventional Drude model even at the lowest frequencies measured.
Abstract: Most plastics are good insulators. But conducting polymers also form the basis of a new field of ‘plastic electronics’. Some of these materials show exceptionally high conductivities, almost as high as metals. But their properties deviate from true metallic behaviour in several important ways. Now a conducting plastic with resistivity properties much more like those of true metals has been synthesized. The properties of this polyaniline compound may bring practical plastic electronics a little closer. True metallic conductivity in a much-studied conducting polymer (polyaniline) is demonstrated, but synthesized by a route that minimizes the density of structural defects believed responsible for the earlier deviations from classical metallic behaviour. Despite nearly three decades of materials development, the transport properties in the ‘metallic state’ of the so-called conducting polymers are still not typical of conventional metals1,2,3,4,5,6,7. The hallmark of metallic resistivity—a monotonic decrease in resistivity with temperature—has not been obtained at temperatures over the full range below room temperature; and a frequency dependent conductivity, σ(ω), typical of metals has also not been observed. In contrast, the low-temperature behaviour of ‘metallic’ polymers has, in all previous cases, exhibited an increase in resistivity as temperature is further decreased, as a result of disorder-induced localization of the charge carriers1,2,3,4. This disorder-induced localization also changes the infrared response such that σ(ω) deviates from the prediction of Drude theory5,6,7. Here we report classic metallic transport data obtained from truly metallic polymers. With polyaniline samples prepared using self-stabilized dispersion polymerization8, we find that for samples having room-temperature conductivities in excess of 1,000 S cm-1, the resistivity decreases monotonically as the temperature is lowered down to 5 K, and that the infrared spectra are characteristic of the conventional Drude model even at the lowest frequencies measured.
804 citations
TL;DR: In this paper, the qulnoid-benzenoid-diimine form is doped by dilute aqueous protonic acids to the metallic regime to give the corresponding iminium salt.
Abstract: “Polyaniline” has been synthesized in various forms both chemically and electrochemically in aqueous media. The qulnoid-benzenoid-diimine form, an insulator, is doped by dilute aqueous protonic acids to the metallic regime ([sgrave] = 5 ohm−1cm−1; compressed pellet) to give the corresponding iminium salt. This represents a new type of p-doping phenomenon in a conducting polymer. Both these forms are stable in the presence of air and/or water. The doping process is reversed by treatment with aqueous alkali. Cyclic voltammetry studies in an aqueous electrolyte show excellent reversibility between selected reduced and oxidized forms of polyaniline.
798 citations