Showing papers in "Synthetic Metals in 1987"

TL;DR: In this paper, the emeraldine oxidation state of polyaniline was converted from an insulator to a metal by treatment with 1M aqueous HCl to form the corresponding salt, emeraldines hydrochloride.

TL;DR: In this paper, the emeraldine base (EB) form of polyaniline can be varied from insulating ( σ −10 ohm −1 cm −1 ) through protonation.

TL;DR: In this article, an aged mixture of Ti(OC 4 H 9 ) 4 /Al(C 2 H 5 ) 3 in silicone oil that has been mixed with various quantities of n-butyllithium and allowed to react with acetylene yields polyacetylene that is highly regular, compact and crystalline in well-defined parallel planes.

TL;DR: In this article, the authors showed that reversible electrochemical oxidation of the leuco-emeraldine base form of polyaniline in the pH range ≈ 1 to ≈ 4 occurs initially with no deprotonation to give the emeraldine salt; continued oxidation occurs with spontaneous deprotion to give pernigraniline base and a rechargeable battery employing analytically pure emeraldines base form as the cathode can be constructed.

TL;DR: The first actual field effect transistor (FET) has been fabricated utilizing polythiophene as an active semiconducting material as mentioned in this paper, and the device is normally off type and the source-drain current can be largely increased by a factor of 10 2 -10 3 by applied gate voltages.

TL;DR: In this article, the infrared and Raman spectra of neutral polythiophene were analyzed on the basis of the data of oligomers (α-bithiophene, α-terthiophen, β-quaterthiopane, and α-sexithiophenes) and deuterated and 2,5-13C-substituted polythyphenes.

TL;DR: The chemically-synthesized emeraldine base form of polyaniline is soluble in aqueous acetic acid solutions, in which it presumably exists as the ‘doped’ emeraldines acetate salt as discussed by the authors.

TL;DR: In this paper, the optimum initial mole ratio of iron(III)/pyrrole for the polymerization by aqueous iron (III) chloride solution at 19°C is shown to be approximately 2.38 ± 0.04.

TL;DR: The first known examples of water-soluble conducting polymers are poly-3-(2-ethaneulfonate)thiophene and poly-4-butanesulfonates (3-3-butane) thiophene.

TL;DR: In this paper, a new and simple model is presented for an organic ferromagnet containing segregated stacks of radical ions, which gives a conceptual framework for selecting candidate molecules, and hence appears to be a promising, general guide for designing new organic Ferromagnetic materials.

TL;DR: In this article, the emeraldine base form of the polymer can be varied from insulating ( σ ∼ 10 −10 ohm −1 cm −1 ) through protonation.

TL;DR: In this paper, optical and electronic properties of composites of soluble polythiophene derivatives and polystyrene over the full range of composition were reported, and the composite films were prepared by evaporating the solvent in an inert atmosphere from a solution containing both polymers.

TL;DR: In this article, the results of a study of strong rectification by metal-polymer (Schottky) diodes made by evaporating metal contacts onto films of a soluble semiconducting polymer cast from solution were presented.

TL;DR: From cyclic voltammetry of polyaniline (PANi) in NH4F, 2.3HF solution (BN) and simple formulae of several acid-base and redox states of PANi, the authors proposed potential-pH, charge and conductivity space diagrams.

TL;DR: In this article, the authors present an analysis of the intensity distribution of X-ray fiber patterns for trans and cis-CHx and deduce the setting angle Φ, the dimerization distortion Δz, the geometry of the carbon chain, the space group, and the anistropy of the Debye-Waller factor.

TL;DR: In this article, a conduction mechanism based upon electron hopping between localized states, assisted by proton exchange, was proposed for polyaniline. But the conduction process of water in a pellet was not investigated.

TL;DR: In this article, the authors showed that poly(3-hexylthiophene (PHT), POT, PDDT, PODT and PEIT were electrochemically prepared in chloroform.

TL;DR: In this article, the structure of polyaniline has been determined by Raman and infrared spectroscopy, which consists of reduced repeat units and protonated oxidized repeat units.

TL;DR: In this paper, an advanced synthetic method of highly oriented polyacetylene film has been developed by applying magnetic force into a polymerization system consisting of nematic liquid crystals, which was carried out at 10 − 13°C in order to keep the nematic phase under magnetic field of 2 − 14 kGauss.

TL;DR: In this article, two kinds of one-dimensional graphite series starting from polyacene and polyphenanthrene have been studied on the basis of the tight-binding crystal orbital (CO) calculations.

TL;DR: In this article, X-ray diffraction and infrared dichroism were used to determine the molecular orientation of poly(p -phenylene vinylene) poly(n) polyvinyl vinylene (PPV) films with various degrees of uniaxial orientation.

TL;DR: In this article, the authors focus on organic polymers that could possess very small bandgaps and therefore display high conductivities intrinsically (i.e., without the need of doping) and establish for those compounds the complete relationship between bandgap and bond-length alternation along the polymer backbone.

TL;DR: In this article, the effective exchange integrals (Jab) for radical clusters linked intra-molecularly with π-networks are calculated by the ab initio GMO method.

TL;DR: The continuous process to synthesize directly polypyrrole films offers a lot of possibilities to vary the film thickness, conductivity, mechanical flexibility and stability as discussed by the authors and also the changing of the counterions leads to different types of structure and quality.

TL;DR: In this article, the amplitude mode model was modified to include an additive extrinsic component Δe to obtain a ld gap 2 Δ = 2.2 eV and 2 Δe = 0.22 eV.

TL;DR: In this paper, a series of solution processible poly(3-alkylthiophenes) is described which form highly conductive, environmentally stable complexes with electron acceptors.

TL;DR: In this article, the third order optical susceptibility (X(3)) in the semiconducting gap of trans -(CH)x has been measured through the technique of third harmonic generation, and the magnitude of X(3) parallel to the polymer chain direction is in excess of 10−9 esu for wavelengths larger than 1.3 μm.

TL;DR: In this article, a mechanism of conduction based upon electron hopping assisted by proton exchange is proposed for polyaniline polysilicon, which is shown to benefit from the presence of water.

TL;DR: In this article, the conditions for the transformation reaction from precursor to PPV using optical and IR absorption were investigated, and also the effects of oxidative doping were investigated in situ and in situ electrochemical doping with iodine and with AsF5.

TL;DR: In this paper, the electrochemical preparation of conductive composite films from polypyrrole and non-conducting polyurethane resin is presented. And the electrical conductivity of the composites falls in the range 1-35 S/cm and is influenced by the electropolymerization conditions (electrode potential, reaction time, type of supporting electrolyte, etc.).