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Type: Artigo de periódico
Title: Dissolved oxygen amperometric sensor based on layer-by-layer assembly using host-guest supramolecular interactions
Author: Damos, FS
Luz, RCS
Tanaka, AA
Kubota, LT
Abstract: The development of a simple, efficient and sensitive sensor for dissolved oxygen is proposed using the host-guest binding of a supramolecular complex at a host surface by combining a self-assembled monolayer (SAM) of mono-(6-deoxy-6-mercapto)-beta-cyclodextrin (beta CDSH), iron (III) tetra-(N-methyl-4-pyridyl)-porphyrin (FeTMPyP) and cyclodextrin-functionalized gold nanoparticles (CDAuNP). The supramolecular modified electrode showed excellent catalytic activity for oxygen reduction. The reduction potential of oxygen was shifted about 200 mV toward less negative values with this modified electrode, presenting a peak current much higher than those observed on a bare gold electrode. Cyclic voltammetry and rotating disk electrode (RDE) experiments indicated that the oxygen reduction reaction involves probably 4-electrons with a rate constant (k(obs)) of 7 x 10(4) mol(-1) Ls(-1). A linear response range from 0.2 up to 6.5 mg L-1. with a sensitivity of 5.5 mu A L mg(-1) (or 77.5 mu A cm(-2) L mg(-1)) and a detection limit of 0.02 mg L-1 was obtained with this sensor. The repeatability of the proposed sensor, evaluated in terms of relative standard deviation was 3.0% for 10 measurements of a solution of 6.5 mg V oxygen. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Oxygen
Layer-by-layer assembly
Host-guest interface
Supramolecular interaction
Amperometric sensor
Country: Holanda
Editor: Elsevier Science Bv
Citation: Analytica Chimica Acta. Elsevier Science Bv, v. 664, n. 2, n. 144, n. 150, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.aca.2010.02.011
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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