Journal
ANALYTICAL CHEMISTRY
Volume 82, Issue 24, Pages 9963-9966Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac102619j
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- American Heart Association, Research Corporation
- National Institutes of Health
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In this report, we demonstrate that quartz nanopipettes modified with an imidazole-terminated silane respond to metal ions (Co2+) in solution. The response of nanopipettes is evaluated through examination of the ion current rectification ratio. When nanopipettes are cycled between solutions of different pH, adsorbed Co2+ can be released from the nanopipette surface, to regenerate binding sites of the nanopipette. These results demonstrate that rectification-based sensing strategies for nanopore sensors can benefit from selection of recognition elements with intermediate binding affinities, such that reversible responses can be attained.
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