Journal
ANALYTICA CHIMICA ACTA
Volume 620, Issue 1-2, Pages 44-49Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2008.05.015
Keywords
carbon nanotubes; gold; nanoparticles; electrode; voltammetry; surface modification
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Gold nanoparticles were deposited electrolessly on multiwalled carbon nanotubes (CNTs) via in situ reduction of HAuCl(4) by NaBH(4). The resulting gold covered nanotubes were immobilised onto the surface of a glassy carbon electrode via evaporation of a suspension in chloroform. Anodic stripping voltammetry was performed with the modified electrode in As(III) solutions. A limit of detection (LOD based on 3 sigma) of 0.1 mu g L(-1) was obtained but more importantly a sensitivity of 1985 LA mu M(-1) was obtained with square wave voltammetry (SWV) in an optimised system with a deposition time of 120 s. These values, particularly the high sensitivity compare favourably with previously reported methods in the area of electrochemical arsenic detection. (c) 2008 Elsevier B.V. All rights reserved.
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