Recent structural investigations of metallic polymers

Pouget, Jean‐Paul; Oblakowski, Z.; Nogami, Yasuyuki; Albouy, Pierre‐Antoine; Laridjani, M.; Oh, Eun Joo; Min, Yonggang; MacDiarmid, Alan G.; Tanida, Jun; Ishiguro, Takehiko; Epstein, Arthur J.

doi:10.1016/0379-6779(94)90174-0

Cited by 146 publications

(89 citation statements)

References 30 publications

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“…A heterogenous conduction model is able to account for the change from nonmetallic to metallic temperature dependence as temperature increases in highly conducting polymers, and also for the fact that thermopower remains metallic in character down to low temperatures [4,5]. The origin of this heterogeneity is the incomplete crystallinity of the polymers, which gives rise to disordered regions around the small crystallites [6]. Data for other aspects of conduction are also consistent with this model [7].…”

Section: Introductionsupporting

confidence: 60%

Charge Transport in Conducting Polymers: Polyacetylene Nanofibres

Kaiser

Rogers

Park

2004

Molecular Crystals and Liquid Crystals

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The preparation of individual polyacetylene nanofibres has allowed a more probing investigation of the properties of polyacetylene. A significant discovery is that at low temperatures, polyacetylene nanofibres show temperature-independent Zener-type tunnelling, that we suggest is tunnelling of the conjugated-bond pattern along single polyacetylene chains. At higher temperatures, the current shows a strong increase with temperature and the nonlinearity of the current-voltage characteristics decreases. We make a comparison with similar behaviour found in single-wall carbon nanotube networks, and show that the decrease in nonlinearity is consistent with our generic calculations for fluctuation-assisted tunnelling and thermal excitation. There is no evidence for superconductivity in resistance measurements on polyacetylene. The thermoelectric power of polyacetylene and other bulk organic conducting polymers indicates the absence of significant superconductivity arising from the conventional electron-phonon mechanism.

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Section: Introductionsupporting

confidence: 60%

Charge Transport in Conducting Polymers: Polyacetylene Nanofibres

Kaiser

Rogers

Park

2004

Molecular Crystals and Liquid Crystals

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“…Hence, the current materials are more highly conducting and homogeneous than before, while the reported localization length ͑ϳ100-200 Å͒ ͑Ref. 31͒ is considerably greater than the structural coherence length ͑ϳ20 Å͒, 32 justifying partly the application of the homogeneous disorder model for which the Anderson-Mott theory applies. However, the validity of a model can only be assessed if it can reproduce the experimental data.…”

mentioning

confidence: 99%

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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“…1 the barriers are represented by the squares, and the triangle in between imitates a scatterer coupling the bridge to a dissipative electron reservoir. Incoming particle fluxes (J i ) are related to those outgoing from the system ( ) by means of the transmission matrix T [29,30]: (4) Off-diagonal matrix elements T ji (E) are probabilities for an electron to be transmitted from the channel i to the channel j, whereas diagonal matrix elements T ii (E) are probabilities for its reflection back to the channel i. To provide charge conservation, the net particle flux in the channels connecting the system with the reservoir must be zero.…”

Section: Electron-resonance Tunneling As a Transport Mechanism In Conmentioning

confidence: 99%

“…In some regions polymer chains are disorderly arranged, forming an amorphous, poorly conducting substance. In other places the chains are ordered and densely packed [3,4]. These regions could behave as metallic-like grains embedded in the disordered environment.…”

Section: Introductionmentioning

confidence: 99%

On the Electron Transport in Conducting Polymer Nanofibers

Zimbovskaya¹

2010

Nanofibers

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Recent structural investigations of metallic polymers

Cited by 146 publications

References 30 publications

Charge Transport in Conducting Polymers: Polyacetylene Nanofibres

Charge Transport in Conducting Polymers: Polyacetylene Nanofibres

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

On the Electron Transport in Conducting Polymer Nanofibers

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