Open AccessAn electronic device based on gold nanoparticles and tetraruthenated porphyrin as an electrochemical sensor for catechol
Author(s) -
Luciana Melo Sousa,
Luana M. Vilarinho,
Gabriel H. Ribeiro,
André L. Bogado,
Luís R. Dinelli
Publication year - 2017
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.170675
Subject(s) - catechol , porphyrin , colloidal gold , electrochemistry , nanoparticle , electrochemical gas sensor , nanotechnology , materials science , photochemistry , chemistry , electrode , organic chemistry
The aim of this study was to obtain an electrochemical device between the electrostatic interaction of the electropolymerized porphyrin {CoTPyP[RuCl 3 (dppb)] 4 }, where TPyP = 5,10,15, 20-tetrapyridilphorphyrin and dppb = 1,4-bis(diphenylphosphino)butane, and gold nanoparticles (AuNPs n− ), to be used as a voltammetric sensor to determine catechol (CC). The modified electrode, labelled as [(CoTPRu 4 ) n 8+ -BE]/AuNPs n− {where BE = bare electrode = glassy carbon electrode (GCE) or indium tin oxide (ITO)}, was made layer-by-layer. Initially, a cationic polymeric film was generated by electropolymerization of the {CoTPyP[RuCl 3 (dppb)] 4 } onto the surface of the bare electrode to produce an intermediary electrode [(CoTPRu 4 ) n 8+ -BE]. Making the final electronic device also involves coating the electrode [(CoTPRu 4 ) n 8+ -BE] using a colloidal suspension of AuNPs n− by electrostatic interaction between the species. Therefore, a bilayer labelled as [(CoTPRu 4 ) n 8+ -BE]/AuNPs n− was produced and used as an electrochemical sensor for CC determination. The electrochemical behaviour of CC was investigated using cyclic voltammetry at [(CoTPRu 4 ) n 8+ -GCE]/AuNPs n− electrode. Compared to the GCE, the [(CoTPRu 4 ) n 8+ -GCE]/AuNPs n− showed higher electrocatalytic activity towards the oxidation of CC. Under the optimized conditions, the calibration curves for CC were 21–1357 µmol l −1 with a high sensitivity of 108 µA µmol l −1 cm −2 . The detection limit was 1.4 µmol l −1 .