Friday, May 02, 2008
Immobilized single-wall carbon nanotubes: application to nanomolar detection of bromate, periodate and iodate
A simple, fast, reproducible and direct procedure was used for adsorption of Os(III)-complex as electron transfer mediator on glassy carbon electrode modified with SWCNTs. By immersing the glassy carbon electrode modified with immobilization of carbon nanotubes in Os-complex solution for less than 1 min a stable thin film of complex adsorbed on the surface of the electrode.The glassy carbon electrode modified with thin film of CNTs/Os-complex showed a stable and reproducible electrochemical behavior, long stability, high electron transfer rate constant and excellent electrochemical reversibility. The Os(IV)/Os (III) redox couple immobilized on SWCNTs, can be used in electrocatalysis as electron transfer mediators to shuttle electrons between analytes and substrate electrodes.
The nanomolar concentration of selected analytes was determined amperometrically at the surface of this modified electrode. The prepared modified electrode can be used as a chronoamperometric detector for periodate, iodate and bromate determination in flow systems or chromatographic instruments. The modification procedure can be used for sensor and biosensor fabrication using other osmium derivatives as electron transfer.
Source: Analytica Chimica Acta (2008), article in press
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