An electronic device based on gold nanoparticles and tetraruthenated porphyrin as an electrochemical sensor for catechol.

Abstract:

:The aim of this study was to obtain an electrochemical device between the electrostatic interaction of the electropolymerized porphyrin {CoTPyP[RuCl3(dppb)]4}, where TPyP = 5,10,15, 20-tetrapyridilphorphyrin and dppb = 1,4-bis(diphenylphosphino)butane, and gold nanoparticles (AuNPsn-), to be used as a voltammetric sensor to determine catechol (CC). The modified electrode, labelled as [(CoTPRu4)n8+-BE]/AuNPsn- {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[RuCl3(dppb)]4} onto the surface of the bare electrode to produce an intermediary electrode [(CoTPRu4)n8+-BE]. Making the final electronic device also involves coating the electrode [(CoTPRu4)n8+-BE] using a colloidal suspension of AuNPsn- by electrostatic interaction between the species. Therefore, a bilayer labelled as [(CoTPRu4)n8+-BE]/AuNPsn- was produced and used as an electrochemical sensor for CC determination. The electrochemical behaviour of CC was investigated using cyclic voltammetry at [(CoTPRu4)n8+-GCE]/AuNPsn- electrode. Compared to the GCE, the [(CoTPRu4)n8+-GCE]/AuNPsn- 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.

journal_name

R Soc Open Sci

authors

Sousa LM,Vilarinho LM,Ribeiro GH,Bogado AL,Dinelli LR

doi

10.1098/rsos.170675

subject

Has Abstract

pub_date

2017-12-20 00:00:00

pages

170675

issue

12

issn

2054-5703

pii

rsos170675

journal_volume

4

pub_type

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