Sensors 2008, 8(8), 5096-5105; doi:10.3390/s8085096
Article

Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform

1 Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa 2 Molecular and Nanomaterials Electrochemistry Laboratory, Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa
* Author to whom correspondence should be addressed.
Received: 21 May 2008; in revised form: 9 June 2008 / Accepted: 11 June 2008 / Published: 27 August 2008
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Abstract: It is shown that iron(II) tetra-aminophthalocyanine complex electropolymerized onto a multi-walled carbon nanotube-modified basal plane pyrolytic graphite electrode greatly enhanced the electrocatalytic detetion of amitrole (a toxic herbicide), resulting in a very low detection limit (0.5 nM) and excellent sensitivity of 8.80±0.44 μA/nM, compared to any known work reported so far. The electrocatalytic detection of amitrole at this electrode occurred at less positive potential (~0.3 V vs Ag|ACl) and also revealed a typical coupled chemical reaction. The mechanism for this response is proposed. The electrode gave satisfactory selectivity to amitrole in the presence of other potential interfering pesticides in aqueous solutions.
Keywords: Amitrole; tetra-aminophthalocyanine; electropolymerization; multi walled carbon nanotubes; basal plane pyrolytic graphite electrode

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MDPI and ACS Style

Siswana, M.; Ozoemena, K.I.; Nyokong, T. Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform. Sensors 2008, 8, 5096-5105.

AMA Style

Siswana M, Ozoemena KI, Nyokong T. Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform. Sensors. 2008; 8(8):5096-5105.

Chicago/Turabian Style

Siswana, Msimelelo; Ozoemena, Kenneth I.; Nyokong, Tebello. 2008. "Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform." Sensors 8, no. 8: 5096-5105.

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