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Electrodes chemically modified by thin films of metallic complexes: electrochemical study and sensor evaluation

Grant number: 13/22087-0
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): January 06, 2014
Effective date (End): January 05, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Carlos José Leopoldo Constantino
Grantee:Cibely da Silva Martin Sonvesso
Supervisor abroad: Christopher Michael Ashton Brett
Home Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
Research place: Universidade de Coimbra (UC), Portugal  
Associated to the scholarship:12/25140-7 - Thin films of metal complexes: the effect of the supramolecular architecture on the application of modified electrodes as catecholamine sensors., BP.DR


Chemically modified electrodes have been of great interest to the development of electrochemical sensors due to the sensitivity increasing and selectivity when compared to the unmodified electrodes. This way, the understanding of chemical and electrochemical reactions occurring at the modified electrode/solution interface has a great importance, since it provides information that helps in the development of modified electrodes more sensitive and selective. The main objective of this project is to evaluate and understand the mechanisms and reactions that occur at the interface of the modified electrodes with metal complexes in absence and presence of analytes in solution, such as catecholamines (object of doctoral research in Brazil). For this reason, the interface study and sensing evaluation of the modified electrode/analytes will be investigated by electrochemical techniques. The cyclic voltammetry studies will allow evaluating the possible structural and/or redox changes of the films coating the electrode surface before, during and after analyte measurements. Complementary, the electrochemical impedance spectroscopy (EIS) will be used to evaluate the possible changes in the modified electrode/solution interface (electronic transfer) when they are in absence and presence of analyte. In a complementary way, the electrochemical quartz crystal microbalance (EQCM) will be used, not only to determine the amount of mass adsorbed and/or lost during the analyte determination, but also to monitor the film growth from the metal complexes. The EIS and EQCM techniques to be used in the internship in Coimbra are complementary to those that have been applied in Brazil in the doctoral research. Thus, an increase of knowledge of the doctorate student and a contribution in the electrochemical interface study and evaluation of the modified electrode as sensor are expected with this project. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARTIN, CIBELY S.; GOUVEIA-CARIDADE, CARLA; CRESPILHO, FRANK N.; CONSTANTINO, CARLOS J. L.; BRETT, CHRISTOPHER M. A. Iron Phthalocyanine Electrodeposited Films: Characterization and Influence on Dopamine Oxidation. Journal of Physical Chemistry C, v. 120, n. 29, p. 15698-15706, JUL 28 2016. Web of Science Citations: 6.
MARTIN, CIBELY S.; GOUVEIA-CARIDADE, CARLA; CRESPILHO, FRANK N.; CONSTANTINO, CARLOS J. L.; BRETT, CHRISTOPHER M. A. Nickel-N,N'-bis(salicylidene)-1,3-propanediamine (Ni-Salpn) film-modified electrodes. Influence of electrodeposition conditions and of electrode material on electrochemical behaviour in aqueous solution. Electrochimica Acta, v. 178, p. 80-91, OCT 1 2015. Web of Science Citations: 9.

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