TITLE

Solid-contact pH-selective electrode using multi-walled carbon nanotubes

AUTHOR(S)
Crespo, Gastón A.; Gugsa, Derese; Macho, Santiago; Rius, F. Xavier
PUB. DATE
December 2009
SOURCE
Analytical & Bioanalytical Chemistry;Dec2009, Vol. 395 Issue 7, p2371
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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 tetrakis[3,5 -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.
ACCESSION #
45362931

 

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