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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5847

Title: Improved photoelectrochemical detection of mercury (II) with a TiO2-modified composite photoelectrode
Authors: Chamier, J
Crouch, AM
Keywords: Photoelectrochemical cells
Mercury (II)
Rhodamine 6G
TiO2
Polyaniline
Issue Date: Jan-2012
Publisher: Elsevier
Citation: Chamier, J and Crouch, AM. 2012. Improved photoelectrochemical detection of mercury (II) with a TiO2-modified composite photoelectrode. Materials Chemistry and Physics, vol. 132(1), pp 10-16
Series/Report no.: Workflow;8552
Abstract: The spectrophotometric change of amercury (II) (Hg2+) selective small molecule chemosensor has been successfully converted into a photovoltaic response upon ligating Hg2+. The photon excitation was followed by charge separation facilitated by TiO2 and polyaniline (PANI), resulting in an electron transfer to an electrical back contact. The photoresponse of the Hg2+ selective chromophore was converted to an electron current equivalent to the amount of Hg2+ in solution. The favourable properties of a Hg2+ sensitive chemosensor was combined with the semiconductor capabilities of TiO2 to construct a sensor that is capable of generating a current in the presence of Hg2+ under illumination. A composite of the fluorescent chemosensor rhodamine 6G hydrozone derivative (RS) and PANI was immobilized on indium tin oxide (ITO) plates coated with TiO2 and subjected to photovoltammetric measurements. The photovoltammetric responses of the coated layers were investigated to determine the sensitivity and selectivity of the immobilized sensor to Hg2+ in the presence of background ions. The photo-response increased linearly with increasing Hg2+ concentration from 10 to 200 µg L-1 with a limit of quantification (LOQ) of 4 µg L-1. The pH independence for the photoresponse was limited by the TiO2 layer and was optimal between pH 6 and 7.
Description: Copyright: 2011 Elsevier. This is an ABSTRACT ONLY.
URI: http://www.sciencedirect.com/science/article/pii/S025405841100558X
http://hdl.handle.net/10204/5847
ISSN: 0254-0584
Appears in Collections:Polymers and composites
Water resources and human health
Nanotechnology
Open source
Metal and metal processes
Sensor science and technology
Manufacturing science and technology
General science, engineering & technology
General research interest

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