Synthesis, electrical, and optical properties of conjugated polymers

Kiebooms, R.; Menon, Reghu; Lee, Kwanghee

doi:10.1016/b978-012513745-4/50064-0

Cited by 45 publications

(37 citation statements)

References 1,048 publications

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“…4,8,12,15 They can provide a qualitative sense of the extent of the disorder present in the sample, since the conductivity is dependent upon the relaxation time, which is controlled by the scattering processes occurring in the material and is, therefore, sensitive to the presence of any disorder in the system. In order to achieve this, the activation energy Wϭd(ln )/d(ln T), being far more sensitive than the conductivity itself 16 can be used, when the sample shows a weakly negative TCR, at temperatures usually below 40 K. W has a positive temperature coefficient for a sample in the metallic regime, it is temperature independent for a sample in the critical regime and has a negative temperature coefficient for a sample at the insulating side of the I-M transition.…”

Section: A Temperature-dependent Conductivity Measurementsmentioning

confidence: 99%

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Doping-dependent studies of the Anderson-Mott localization in polyaniline at the metal-insulator boundary

et al. 2002

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review B 66, 085202 c 2002 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Temperature-dependent dc conductivity measurements and infrared reflectivity measurements ͑20-9000 cm Ϫ1͒ were performed on a series of polyaniline samples with two different dopant acids at various doping levels. The typical fingerprints of a disordered metal such as a positive temperature coefficient of resistivity at high temperatures, a very high reflectivity in the far infrared, and a plasma resonance have been observed. The results were analyzed in the framework of the Anderson-Mott localization model and considerable consistency between transport studies and optical measurements was obtained. Various parameters enabling a comparative classification of the materials are also reported.

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Section: A Temperature-dependent Conductivity Measurementsmentioning

confidence: 99%

“…The key role held by the doping in the metal-insulator transition has been widely and unequivocally acknowledged in the field. [2][3][4] Nevertheless, its effect on the nature of the metallic states is still debated as many different models have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Doping-dependent studies of the Anderson-Mott localization in polyaniline at the metal-insulator boundary

et al. 2002

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“…The MC values displayed are significantly larger than the previous sample, exceeding 40% at 1.5 K. The dramatic increase of the negative MC as the sample crossed from the metallic ͑60% doping level͒ to the insulating regime ͑30%͒ is something typical for samples in the insulating regime of a MI transition. 12,32,48 The largely negative values of MC in the insulating regime can be attributed to the reduction of the overlap of the localized wave functions under the influence of the magnetic fields and the field's effect on the hopping transport among the localized states. The proportional relation among MC and the extent of disorder can be used in order to classify the systems according to their degree of disorder and their relative position on the insulating regime on a virtual MI transition diagram.…”

Section: Pani-csa 30%mentioning

confidence: 99%

“…31 Recent advancements in the processibility of conducting polymers have significantly improved the quality of the materials by reducing the extent of the disorder in such a way that the localization length, which characterizes the extent of the electronic wave functions, becomes greater than the averaged-over structural coherence length that characterises the size of the crystalline regions. 18,32,33 In such a case the disorder can be regarded as homogeneous since the system sees an average of the random fluctuation of the disorder potentials and can, arguably, be described by the localization-interaction model.…”

Section: Introductionmentioning

confidence: 99%

Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline films at the metal-insulator boundary

2003

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(2003) 'Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline lms at the metal-insulator boundary. ', Physical review B., 68 (24). p. 245106.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevB.68.245106Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review B 68, 245106 c (2003) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Low temperature ͑down to 1.5 K͒ conductivity and high-field ͑up to 13.09ϫ10 4 Oe) magnetoconductivity measurements were performed on three different polyaniline films doped with two dopant acids. The transport behavior of those systems, which lay on either side of the metal-insulator transition, was investigated within the framework of the localization-interaction model and parameters that can implicitly determine the degree of the disorder present in the systems have been evaluated. The suitability, consistency, and limitations of the model for the study of conducting polymers close to the metal-insulator transition are thoroughly discussed.

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“…Thus, radicals derived from monomers of high oxidation potentials undergo rapid reactions with the solvent or anions to form soluble products rather than to electropolymerize. 63 Moreover, the anodic polymerization of thiophenes with reactive functional groups (e.g. -NH 2 , -OH and -COOH) has been reported to be difficult due to their substantial nucleophilicity.…”

Section: Introductionmentioning

confidence: 99%

Electroactive and bioactive films of random copolymers containing terthiophene, carboxyl and Schiff base functionalities in the main chain

et al. 2015

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A new bis-thienyl type monomer with preformed azomethine linkages (AzbT) was chemically synthesized and, subsequently, electro-copolymerized with 2,2′:5′,2′′-terthiophene (Th 3 ). AzbT:Th 3 mixtures with different molar ratios (i.e. 50:50, 60:40 and 80:20) were considered, the resulting thin films being made of random insoluble copolymers, P(AzbT-co-Th 3 )s. The content of AzbT in P(AzbT-co-Th 3 )s was found to increase with the AzbT:Th 3 molar ratio in the electropolymerization medium. Furthermore, characterization of the different copolymers suggests the existence of several concomitant processes in the reaction medium. Thus, depending on the composition of the reaction medium, AzbT worked as a co-monomer and/or as a dopant for the growing polymer chains. The morphology of the films evolved from a porous multi-level surface to a more compact and flat globular structure with increasing AzbT content. On the other hand, the electrochemical and optical properties were also

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Synthesis, electrical, and optical properties of conjugated polymers

Cited by 45 publications

References 1,048 publications

Doping-dependent studies of the Anderson-Mott localization in polyaniline at the metal-insulator boundary

Doping-dependent studies of the Anderson-Mott localization in polyaniline at the metal-insulator boundary

Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline films at the metal-insulator boundary

Electroactive and bioactive films of random copolymers containing terthiophene, carboxyl and Schiff base functionalities in the main chain

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