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Reversible cobalt ion binding to imidazole-modified nanopipettes.


ABSTRACT: In this report, we demonstrate that quartz nanopipettes modified with an imidazole-terminated silane respond to metal ions (Co(2+)) 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 Co(2+) 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.

SUBMITTER: Sa N 

PROVIDER: S-EPMC3075968 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature

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Reversible cobalt ion binding to imidazole-modified nanopipettes.

Sa Niya N   Fu Yaqin Y   Baker Lane A LA  

Analytical chemistry 20101123 24


In this report, we demonstrate that quartz nanopipettes modified with an imidazole-terminated silane respond to metal ions (Co(2+)) 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 Co(2+) can be released from the nanopipette surface, to regenerate binding sites of the nanopipette. These results demonstrate that rectification-based sensing strategies for nanop  ...[more]

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