Conductive, Capacitive, and Viscoelastic Properties of a New Composite of the C₆₀−Pd Conducting Polymer and Single-Wall Carbon Nanotubes

Abstract

Thin films of a new composite of an electroactive fullerene-based (C60-Pd) polymer and HiPCO single-wall carbon nanotubes, which were noncovalently modified by 1-pyrenebutiric acid (pyr-SWCNTs), were electrochemically prepared under multiscan cyclic voltammetry conditions. With respect to blank polymer, superior conductive, capacitive, and viscoelasitic properties of the composite were demonstrated. Composition of pyr-SWCNTs was determined by thermogravimetric analyses, which showed one molecule of 1-pyrenebutiric acid per approximately 20 carbon atoms of SWCNT. Atomic force microscopy imaging revealed that pyr-SWCNTs form tangles of pyr-SWCNTs bundles surrounded by globular clusters of the C60-Pd polymer. Peaks characteristic of both pyr-SWCNTs (radial breathing modes at approximately 200 to 300 cm(-1)) and C60-Pd polymer in the Raman spectra recorded for the composite confirmed the presence of pyr-SWCNTs in the composite film. The mass of the deposited film was in situ measured by piezoelectric microgravimetry with the use of an electrochemical quartz crystal microbalance (EQCM). Then, curves of the current, resonant frequency change, and dynamic resistance change versus the potential in different potential ranges were simultaneously recorded in a blank acetonitrile solution of tetrabutylammonium perchlorate. Specific capacitance, determined at -1.20 V for the composite as 90 F g(-1), was twice as high as that for the polymer. Electrochemical impedance spectroscopy was used to determine impedance parameters of both the C60-Pd polymer and C60-Pd/pyr-SWCNTs composite film. This data analysis indicated increased capacitance and decreased resistance for the new composite film.

Enzymatic polymerization of polythiophene by immobilized glucose oxidase

“…The CPs can be characterized by the physicochemical properties of both organic polymers (different permeability of various substances, viscoelasticity) and semiconductors (conductivity) [2]. The conductivity of polymers consisting of heterocyclic monomers connected to the conjugated system after the attachment of different redox groups to the monomer backbone could increase from semi-conductor to almost metal level [3].…”

Viscoelastic potential-induced changes in acoustically thin films explored by quartz crystal microbalance with motional resistance monitoring

“…The versatility of provides information on the viscoelastic effects, magnetic properties, molecular interactions, film porosity, metal conversions or electrocatalysis [28][29][30][31][32][33]. Moreover, allows the resonant frequency changes affected by viscous film coats to be estimated [34].…”

“…Viscoelastic properties of acoustically thin ICP films have been widely investigated [10,13,19,[34][35][36][37][38]. However, viscoelastic parameters seem difficult to be extracted by BVD analysis because the resonant response is essentially gravimetric [21].…”

Two-component polymer films of palladium and fullerene with covalently linked crown ether voids: effect of cation binding on the redox behavior

“…Recently, we developed an electrochemical procedure for the formation of two-component fullerene films based on the electroreduction carried out in a solution containing fullerene [32][33][34][35][36] or fullerene derivatives [37][38][39][40] and various transition metal complexes. In these polymers, fullerene moieties are covalently bonded to transition metal atoms or their complexes to form a polymeric network.…”