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Chun-Ze Lai Marti M. Joyer Melissa A. Fierke Nicholas D. Petkovich Andreas Stein Philippe Bühlmann 《Journal of Solid State Electrochemistry》2009,13(1):123-128
Solid-contact ion-selective electrodes (SC-ISEs) can exhibit very low detection limits and, in contrast to conventional ISEs,
do not require an optimization of the inner filling solution. This work shows that subnanomolar detection limits can also
be achieved with SC-ISEs with three-dimensionally ordered macroporous (3DOM) carbon contacts, which have been shown recently
to exhibit excellent long-term stabilities and good resistance to the interferences from oxygen and light. The detection limit
of 3DOM carbon-contacted electrodes with plasticized poly-(vinyl chloride) as membrane matrix can be improved with a high
polymer content of the sensing membrane, a large ratio of ionophore and ionic sites, and conditioning with a low concentration
of analyte ions. This permits detection limits as low as 1.6 × 10−7 M for K+ and 4.0 × 10−11 M for Ag+. 相似文献
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