Showing papers in "Synthetic Metals in 1999"

TL;DR: In this article, four kinds of single-wall carbon nanotubes (SWNTs) with different diameter distribution have been synthesized and optical absorption spectra have been measured.

TL;DR: In this article, the electrochemical p-doping potentials of 10 soluble poly(1,4-phenylene vinylene) (PPV) derivatives and of the conjugated polymer blend in a light-emitting electrochemical cell (LEC) were measured by cyclic voltammetry.

TL;DR: In this paper, the effect of heating PEDOT to 200 °C was studied, which corroborates with the optical anisotropy. But the effect was limited, and evidence was found for a paracrystalline structure.

TL;DR: A brief review on electrocatalysis and heterogeneous catalysis at conducting polymers is presented in this article, where the topics covered include: electrocatalysts at conducting polymer electrodes (quinone-hydroquinone redox couple, organic compounds of analytical interest, various electroorganic reactions, inorganic ions), electrocatalysings at polymer electrodes, modified with dispersed metals, heterogeneous Catalysis and Electrocatalysis at polymers, doped with heteropolyanions, and various metal complexes.

TL;DR: In this article, the morphology of pentacene triclinic bulk phases on SiO 2 substrates was identified using atomic force microscopy and X-ray diffraction techniques.

TL;DR: In this paper, the thickness and electrical properties of polyaniline hydrochloride films were determined by optical interferometry and linked to their optical absorption at the wavelength 400 nm, A 400 =(5.4±0.2)×10 −3 d f (in nm).

TL;DR: In this paper, the authors measured the thermal conductivity (κ) of bulk samples of single-walled nanotube (SWNT) bundles, and found that the phonon mean free path is of order 100 nm.

TL;DR: In this article, the authors considered a version of multiprocessor scheduling with the special feature that jobs may be rejected at a certain penalty, and they gave a 1 + ρ ≈ 2.618 competitive algorithm for the on-line version of the problem, where ρ is the golden ratio.

TL;DR: In this paper, a multilayer polyaniline (PAN) and conducting powders such as graphite, graphite and carbon black is measured in the frequency range from 10 MHz to 1 GHz by using ASTM D4935-89 technique.

TL;DR: In this article, two glass transitions (T g ), ∼70°C and ∼250°C, were observed for the first time using MDSC during the process of heat treatment.

TL;DR: In this article, the authors report comprehensive, cumulative broadband measurements and computations of all microwave parameters of a conducting polymers (CPs) relevant for practical application, viz., conductivity, absorption, complex permittivity, shielding and reflection.

TL;DR: In this article, a comparative study of carbon and composite single wall nanotubes using a non-orthogonal tight binding formalism is presented, and it is shown that carbon has a higher Young Modulus (1TPa) than any of the studied composite nanotube and of the same order that found for graphene sheets without defect.

TL;DR: An improved poly-hexylthiophene (P3HT) polymer field effect transistor with field effect mobility of 0.05-0.1 cm2/Vs and ON-OFF current ratio of 106-108 is demonstrated in this article.

TL;DR: In this article, a review of the NMR investigations of graphite fluorides and fluorine-graphite intercalation compounds is presented, where the origin of semimetal metal and metal-insulator transformations, localization effects and C-F bonding in fluorine graphite intercation compounds are discussed.

TL;DR: In this paper, the authors developed a new type of electrochemical sensors, based on electroactive polypyrrole functionalized with oligonucleotide (ODN), showing a high electroactivity in aqueous medium.

TL;DR: In this paper, high piezoresistive conducting polyaniline-titanium oxide (PANI/TiO2) composites have been synthesized by ''in situ'' deposition technique by placing the fine grade powder (average particle size of approximately 100 nm) of anatase TiO2 in the polymerization reaction mixture of aniline.

TL;DR: In this article, a unique process of polymerization in an aqueous medium of an anilinium-dodecyl benzene sulfonic acid (DBSA) complex obtained by reacting aniline with DBSA prior to polymerization was described.

TL;DR: In this paper, the stability of polythienylene vinylene field effect transistors under gate bias stress was investigated and shown to be stable at time scales up to 1000 s and temperatures up to 140 °C.

TL;DR: In this article, the authors demonstrate the operation of polypyrrole linear actuators in air and demonstrate that these actuators are capable of generating stresses exceeding those of mammalian skeletal muscle.

TL;DR: In this article, the electrical conductivities of individual multi-wall carbon nano tubes have been measured using a micro manipulator by two probe method, and it is found that the enormously large current density more than 106 A/cm2 can flow in a piece of individual nano tubes.

TL;DR: In this paper, the electrical properties of the doped (doping agents: iodine, antimony pentafluoride, aluminum and ferric chloride) and undoped polymers were determined at room temperature and atmospheric pressure.

TL;DR: In this paper, a method is described to derive the mobility of organic field effect transistors (OFETs) by using the current-voltage characteristics at low drain voltage.

TL;DR: In this paper, the authors present efficiency and stability studies on large area (6 cm x 6 cm) flexible solar cells and compare them with small area (mm2) devices, and the influence of conventional polymers as additives for the photoactive compounds in order to improve homogenous film formation.

TL;DR: In this paper, it has been found that polyaniline epoxy blend coatings on mild steel have been studied in neutral, acidic and alkaline solutions with various electrochemical methods.

TL;DR: It was observed that inflammation associated with the various forms of PANi was minimal after 50 weeks and the pristine EM film was encapsulated by several loosely arranged fibrous tissue, while the collagen-immobilized EM film, on the other hand, showed no features resulting from tissue incompatibility near the implant.

TL;DR: In this article, an Intrinsically conducting hot melt adhesives (ICHMAs) based on polypyrrole (PPy) blends have been developed for use in electronic and telecommunication applications requiring shielding against electromagnetic interference (EMI).

TL;DR: In this paper, different purification methods of carbon nanotubes produced by catalytic process are described, based on the reactivity differences between carbon and impurities (principally amorphous carbon).

TL;DR: In this article, a comprehensive search for structure/property correlations in the Raman spectra of oligo and polythiophenes is carried out for many homologous series of oligothophenes (approximately 50 compounds).

TL;DR: In this article, the ultraviolet photoelectron spectroscopy (UPS) of purified multi-wall carbon nanotubes was carried out by successive sonication, centrifuge, sedimentation, and filtration processes.

TL;DR: In this article, the polyaniline is applied as a coating on the aluminum coupons which were exposed to a variety of corrosive environments, including 0.1 M NaCl, and the oxide layers that formed were studied by X-ray photoelectron spectroscopy depth profiling using argon sputtering.