Solid-contact pH-selective electrode using multi-walled carbon nanotubes |
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Authors: | Gastón A Crespo Derese Gugsa Santiago Macho F Xavier Rius |
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Institution: | (1) Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, 43007 Tarragona, Spain; |
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Abstract: | Multi-walled carbon nanotubes (MWCNT) are shown to be efficient transducers of the ionic-to-electronic current. This enables
the development of a new solid-contact pH-selective electrode that is based on the deposition of a 35-μm thick layer of MWCNT
between the acrylic ion-selective membrane and the glassy carbon rod used as the electrical conductor. The ion-selective membrane
was prepared by incorporating tridodecylamine as the ionophore, potassium tetrakis3,5-bis(trifluoromethyl)phenyl]borate as the lipophilic additive in a polymerized methylmethacrylate and an n-butyl acrylate matrix. The potentiometric response shows Nernstian behaviour and a linear dynamic range between 2.89 and
9.90 pH values. The response time for this electrode was less than 10 s throughout the whole working range. The electrode
shows a high selectivity towards interfering ions. Electrochemical impedance spectroscopy and chronopotentiometry techniques
were used to characterise the electrochemical behaviour and the stability of the carbon-nanotube-based ion-selective electrodes. |
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