Ion-selective electrodes with three-dimensionally ordered macroporous carbon as the solid contact

Chun Ze Lai, Melissa A. Fierke, Andreas Stein, Philippe Bühlmann

Research output: Contribution to journalArticlepeer-review

188 Scopus citations

Abstract

Electrodes with three-dimensionally ordered macroporous (3DOM) carbon as the intermediate layer between an ionophore-doped solvent polymeric membrane and a metal contact are presented as a novel approach to solid-contact ion-selective electrodes (SC-ISEs). Due to the well-interconnected pore and wall structure of 3DOM carbon, filling of the 3DOM pores with an electrolyte solution results in a nanostructured material that exhibits high ionic and electric conductivity. The long-term drift of freshly prepared SC-ISEs with 3DOM carbon contacts is only 11.7 μV/h, and does not increase when in contact with solution for 1 month, making this the most stable SC-ISE reported so far. The electrodes show good resistance to the interference from oxygen. Moreover, in contrast to previously reported SC-ISEs with conducting polymers as the intermediate layer, 3DOM carbon is an electron conductor rather than a semiconductor, eliminating any light interference.

Original languageEnglish (US)
Pages (from-to)4621-4626
Number of pages6
JournalAnalytical chemistry
Volume79
Issue number12
DOIs
StatePublished - Jun 15 2007

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