Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 118, Issue 19, Pages 5130-5134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp502715q
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2013R1A3A2042120, 2010-0024525, 2011-0030228, 2008-0061893]
- National Research Foundation of Korea [2008-0061893, 2010-0024525, 2011-0030228] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ion-selective electrodes (ISEs) are widely used to detect targeted ions in solution selectively. Application of an ISE to a small area detection system with a nanopipette requires a special measurement method in order to avoid the enhanced background signal problem caused by a cation-rich layer near the charged inner surface of the nanopipette and the selectivity change problem due to relatively fast saturation of the ISE inside the nanopipette. We developed a novel ion-selective detection system using a nanopipette that measures an alternating current (AC) signal mediated by saturated ionophores in a poly(vinyl chloride) (PVC) membrane located at the conical shank of the nanopipette to solve the above problems. Small but reliable K+ and Na+ ionic current passing through a PVC membrane containing saturated bis(benzo-15-crown-5) and bis(12-crown-4) ionophore, respectively, could be selectively detected using the AC signal measurement system equipped with a lock-in amplifier.
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