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Title: Characterisation of screen-printed gold and gold nanoparticle-modified carbon sensors by electrochemical impedance spectroscopy
Authors: Bernalte, Elena 
Marín-Sánchez, Carmen 
Pinilla-Gil, Eduardo 
Brett, Christopher M. A. 
Keywords: Gold-based screen-printed electrodes; EIS; Hg
Issue Date: 15-Nov-2013
Publisher: Elsevier
Citation: BERNALTE, Elena [et. al] - Characterisation of screen-printed gold and gold nanoparticle-modified carbon sensors by electrochemical impedance spectroscopy. "Journal of Electroanalytical Chemistry". ISSN 1572-6657. Vol. 709 (2013) p. 70-76
Serial title, monograph or event: Journal of Electroanalytical Chemistry
Volume: 709
Abstract: Gold-based screen-printed electrodes have been characterised by electrochemical impedance spectroscopy (EIS) to better understand their behaviour in electroanalytical applications, particularly in the anodic stripping voltammetry of Hg(II). After a first exploration by cyclic voltammetry, impedance spectra of gold-based screen-printed sensors were recorded in 0.1 M HCl electrolyte solution, in the presence of dissolved oxygen and with no electrochemical pre-treatment of the surface. The spectra demonstrated the differences in the interfacial characteristics of each kind of sensor. Structural changes in the surface of SPGEs caused by amalgam formation in the presence of Hg(II) were investigated by EIS. The results obtained were used to elucidate the implications for using the sensor in the stripping voltammetric determination of Hg(II) in environmental samples.
ISSN: 1572-6657
DOI: 10.1016/j.jelechem.2013.09.007
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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