Fabrication and characterization of single walled carbon nanotubes-iron phthalocyanine nano-composite: Surface properties and electron transport dynamics of its self assembled monolayer film
No Thumbnail Available
Date
2010-05-25
Authors
Akinbulu, I.A
Nyokong, T
Journal Title
Journal ISSN
Volume Title
Publisher
RSC
Abstract
Nano-composite of single walled carbon nanotubes (SWCNTs) and iron phthalocyanine, peripherally tetra-substituted with diethylaminoethanethiol (complex 2), was fabricated and characterized by infra red (IR) spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM technique gave a convincing image of the nano-composite. Self-assembled monolayer (SAM) film of the composite (SWCNT-2-SAM) was formed on gold electrode. Its surface properties were investigated, relative to that of 2-SAM film, by cyclic voltammetry and scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry, using [Fe(CN)6] 3 as redox probe, were used to investigate the dynamics of electron transport in the SWCNT-2-SAM film. Lower charge transfer resistance, RCT, of the SWCNT-2-SAM modified Au electrode, relative to that of the 2-SAM modified Au electrode, was an indication of enhanced electron transport in the presence of SWCNT. The SAM film of the nano-composite showed better electrocatalytic behaviour, relative to that of 2-SAM film, towards the oxidation of the insecticide, carbofuran. The electrode (SWCNT-2-SAM) showed good selectivity for carbofuran, in the presence of diazinon (a non-electroactive interferent) and at lower concentration of the electroactive interferents (chlorpyrifos and dichlorfos).
Description
Staff publications
Keywords
Iron phthalocyanine , Electrochemical , spectroscopy , Research Subject Categories::NATURAL SCIENCES::Chemistry
Citation
Akinbulu, I. A., & Nyokong, T. (2010). Fabrication and characterization of single walled carbon nanotubes-iron phthalocyanine nano-composite: surface properties and electron transport dynamics of its self assembled monolayer film. New Journal of Chemistry, 34(12), 2875-2886.