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Title: Poly(glutamic acid) nanofibre modified glassy carbon electrode: Characterization by atomic force microscopy, voltammetry and electrochemical impedance
Authors: Santos, Daniela Pereira 
Zanoni, Maria Valnice Boldrin 
Bergamini, Márcio Fernando 
Paquim, Ana Maria Chiorcea 
Diculescu, Victor Constantin 
Brett, Ana-Maria Oliveira 
Keywords: Poly(glutamic acid) (PAG); Atomic force microscopy (AFM); Electrochemical impedance spectroscopy (EIS); Modified electrode; Nanofibres
Issue Date: 2008
Citation: Electrochimica Acta. 53:11 (2008) 3991-4000
Abstract: Glassy carbon electrodes (GCE) were modified with poly(glutamic acid) acid films prepared using three different procedures: glutamic acid monomer electropolymerization (MONO), evaporation of poly(glutamic acid) (PAG) and evaporation of a mixture of poly(glutamic acid)/glutaraldehyde (PAG/GLU). All three films showed good adherence to the electrode surface. The performance of the modified GCE was investigated by cyclic voltammetry and differential pulse voltammetry, and the films were characterized by atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). The three poly(glutamic acid) modified GCEs were tested using the electrochemical oxidation of ascorbic acid and a decrease of the overpotential and the improvement of the oxidation peak current was observed. The PAG modified electrode surfaces gave the best results. AFM morphological images showed a polymeric network film formed by well-defined nanofibres that may undergo extensive swelling in solution, allowing an easier electron transfer and higher oxidation peaks.
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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