ESR and visible spectral study of polyaniline in solution

Geskin, Victor; Khidekel, M. L.; Letuchy, Ya.A.; Grundel, L.M.; Minina, N. E.; Kazakova, V. M.

doi:10.1016/0379-6779(91)91516-d

Cited by 1 publication

(3 citation statements)

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“…The 1 eV absorption appears to be dominated by the free carrier intraband absorption (with possibly a small gap in the deep infrared; see the following section on magnetic susceptibility). These features of the [1S],(A-)n spectrum are in good agreement with the transitions expected based on an analysis of the VEH electronic band structure calculations [44,45]. Overoxidation of polyaniline in sulfuric acid leads to conversion to the formation of an array of charged bipolarons on the polyaniline chains.…”

Section: Polyaniline In Solution (Fully and Partially Protonated)supporting

confidence: 71%

“…That transport along the chain is much more facile than interchain hopping is not surprising; as argued in Section I, the large intra-chain xelectron transfer integrals characteristic of conjugated polymers imply that this should be the case. In fact, intra-chain band widths of several electron volts have been estimated for the conduction band of doped polyaniline [44]. The implied relatively large value for 'ti is consistent with relatively weak interchain coupling typical of doped conjugated polymers.…”

Section: (Iii) Implications For Polyanilinementioning

confidence: 69%

“…In organic solvents, such as N,Ndimethylacetamide, the degree of protonation can be controlled by the addition of perchloric acid [44]. Thus, spectroscopic and magnetic studies of the electronic structure of the one-dimensional semiconducting and "metallic" chains in solution are particularly interesting.…”

Section: Polyaniline In Solution (Fully and Partially Protonated)mentioning

confidence: 99%

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Controlled Molecular Assemblies of Electrically Conductive Polymers

Rubner¹,

Skotheim²

1991

Conjugated Polymers

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ABSTRACT. The Langmuir-Blodgett technique has recently been used to manipulate a variety of electroactive conjugated polymers into multilayer thin films with well defined layered structures and ordered molecular organizations. Multilayer thin films have been successfully fabricated from amphiphilic conjugated polymers and their precursors and from non-surface active conjugated polymers. In most cases, the molecular organizations of these films have been found to be highly anisotropic. The structures of these films have been probed by high energy synchrotron radiation, reflection-absorption infrared and low angle x-ray diffraction techniques. Electrical measurements have also revealed highly anisotropic behavior with the in-plane conductivities of these multilayer structures typically being many orders of magnitude greater than their transverse conductivities. The unique layered structures of these films, in some cases, have also been shown to give rise to unusually large dielectric constants over a wide frequency range. In this chapter, the fabrication, characterization and electrical properties of these new thin film multilayer structures are discussed. . IntroductionOver the past few years, the practice of molecular engineering has guided the design and synthesis of new electroactive polymers and has provided a deeper understanding of the structure-property relationships active in this very interesting class of materials. Molecular engineering in the simplest sense simply involves the manipulation and control of the physical and electronic properties of polymeric materials by suitable modifications of their molecular structures. Through this approach, it is possible to systematically alter the electrical, optical, mechanical and processing properties of electroactive polymers with the ultimate goal being the creation of materials with a collection of properties optimized for a particular technological application or scientific endeavor. The logical extension of this molecular manipulation approach is the development of techniques that provide control over the molecular and supermolecular organizations of these newly synthesized molecules. The net result would be an ability to design and fabricate complex molecular assemblies with controllable molecular architectures and well defined molecular arrangements. One could further envision the creation of multicomponent molecular assemblies in which each component serves a specific well defined function and is 363 J.L.