Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/12882
Title: Development and characterization of a new conducting carbon composite electrode
Authors: Barsan, Madalina M. 
Pinto, Edilson M. 
Florescu, Monica 
Brett, Christopher M. A. 
Keywords: Graphite; Cellulose acetate; Composite electrode; Neutral red; Ascorbate
Issue Date: 2-Mar-2009
Publisher: Elsevier B.V.
Citation: Analytica Chimica Acta. 635:1 (2009) 71-78
Abstract: A new conducting composite flexible material prepared from cellulose acetate (CA) polymer and graphite has been developed and used for the fabrication of electrodes, which were then characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Scanning electron microscopy (SEM) was used to provide information concerning the morphology of the composite electrode surface. The potential window, background currents and capacitance were evaluated by cyclic voltammetry in the pH range from 4.6 to 8.2. The voltammetry of model electroactive species demonstrates a close to reversible electrochemical behaviour, under linear diffusion control. The electroactive area of the composite electrodes increases after appropriate electrode polishing and electrochemical pre-treatment. The electrodes were used as substrate for the electropolymerisation of the phenazine dye neutral red, for future use as redox mediator in electrochemical biosensors. The composite electrodes were also successfully used for the amperometric detection of ascorbate at 0.0 V vs. SCE, and applied to the measurement of ascorbate in Vitamin C tablets; the sensor exhibits high sensitivity and a low detection limit of 7.7 [mu]M. Perspectives for use as a versatile, mechanically flexible and robust composite electrode of easily adaptable dimensions are indicated
URI: http://hdl.handle.net/10316/12882
ISSN: 0003-2670
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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