Structural and electrical characterization of hybrid metal-polypyrrole nanowires

We present here the synthesis and structural characterization of hybrid Au-polypyrrole-Au and Pt- polypyrrole-Au nanowires together with a study of their electrical properties from room-temperature down to very low temperature. A careful characterization of the metal-polymer interfaces by trans- mission electron microscopy revealed that the structure and mechanical strength of bottom and upper interfaces are very different. Variable temperature electrical transport measurements were performed on both multiple nanowires - contained within the polycarbonate template - and single nanowires. Our data show that the three-dimensional Mott variable-range-hopping model provides a complete framework for the understanding of transport in PPy nanowires, including non-linear current-voltage characteristics and magnetotransport at low temperatures.Comment: Phys. Rev. B Vol. 76 Issue 11 (2007

Electrosynthesis of polypyrrole nanotubules using particle track-etched membranes as template

Polypyrrole has been electrochemically synthesized inside the pores of nanoporous polycarbonate particle track-etched membranes. The morphology and the electrochemical properties of the obtained nanomaterials, using two types of doping anions (poly (sodium-4-styrenesulfonate) and lithium perchlorate) has been studied

Titania/polypyrrole hybrid nanocomposites built from in-situ generated organically functionalized nanoanatase building blocks

A bifunctional capping ligand is used to obtain pyrrol-functionalized monodispersed nano-crystalline TiO2 (anatase) particles in a single step. The pyrrole functionalities in the shell are then (electro)chemically polymerized to create a polypyrrole (PPy)/TiO2 hybrid nano-composite film (see Figure). Further electronic modification of the conducting polymer is possible, leading to a great variety of potential applications

Transport and vibrational properties of poly(3,4-ethylenedioxythiophene) nanofibers

Nanofibers of poly(3,4-ethylenedioxythiophene) (PEDOT) have been electrochemically synthesized by the template method and their morphology determined using electron microscopy. A comparative resonant Raman scattering study has been performed on films, bundles of fibers and individual fibers of different diameters. Their temperature dependent transport properties have also been investigated and compared with the case of a PEDOT thin film. The PEDOT is found to be in an insulating state close to the metal-insulator transition. The temperature dependence of the fibers' conductance is larger than for the films, and this variation increases for a smaller fiber diameter. These results suggest that a confining effect on the PEDOT structure occurs during the electrochemical synthesis in the template. (C) 2002 Elsevier Science B.V. All rights reserved