4.6 Article

Functional multiwalled carbon nanotube nanocomposite with iron picket-fence porphyrin and its electrocatalytic behavior

期刊

ELECTROCHEMISTRY COMMUNICATIONS
卷 9, 期 10, 页码 2564-2570

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.08.003

关键词

iron porphyrin; multiwalled carbon nanotubes; gold nanoparticles; nanocomposites modified electrode; amperometric sensor; dissolved oxygen

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A kind of nanocomposite with good dispersion in water was prepared through noncovalent adsorption of iron picket-fence porphyrin (FeTMAPP), iron-5,10,15,20-tetrakis[alpha alpha alpha alpha-2-trismethylammoniomethyl-phenyl]porphyrin, on multiwalled carbon nanotubes (MWNTs). UV-visible spectroscopic and electrochemical methods were used to characterize the nanocomposite. A gold nanoparticles/nanocomposite self-assembled monolayer was formed on gold electrode and showed highly synergetic behavior towards the electrocatalytic reduction Of 02 with a decrease of overpotential of 200 mV. FeTMAPP acted as the catalytic active center, and MWNTs increased the amount of FeTMAPP adsorbed and accelerated the electron transfer between FeTMAPP and electrode. The resulting biosensor exhibited good response to oxygen with a linear range from 0.52 to 180 mu M and a detection limit of 0.38 mu M, without the interference of ascorbic acid and uric acid, which showed an application potential of the proposed nanocomposite and monolayer in detection of dissolved oxygen and oxidase substrates. (C) 2007 Elsevier B.V. All rights reserved.

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