Current rectification with poly-L-lysine-coated quartz nanopipettes

Senkei Umehara; Nader Pourmand; Chris D. Webb; Ronald W. Davis; Kenji Yasuda; Miloslav Karhanek

doi:10.1021/nl061681k

Current rectification with poly-L-lysine-coated quartz nanopipettes

Senkei Umehara, Nader Pourmand, Chris D. Webb, Ronald W. Davis, Kenji Yasuda, Miloslav Karhanek

Research output: Contribution to journal › Article › peer-review

156 Citations (Scopus)

Abstract

Ion current rectification with quartz nanopipette electrodes was investigated through the control of the surface charge. The presence and absence of a positively charged poly-L-lysine (PLL) coating resulted in the rectified current with opposite polarity. The results agreed with the theories developed for current-rectifying conical nanopores, suggesting the similar underlying mechanism among asymmetric nanostructure in general. This surface condition dependence can be used as the fundamental principle of multi-purpose real-time in vivo biosensors.

Original language	English
Pages (from-to)	2486-2492
Number of pages	7
Journal	Nano Letters
Volume	6
Issue number	11
DOIs	https://doi.org/10.1021/nl061681k
Publication status	Published - 2006 Nov
Externally published	Yes

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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AU - Yasuda, Kenji

AU - Karhanek, Miloslav

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AB - Ion current rectification with quartz nanopipette electrodes was investigated through the control of the surface charge. The presence and absence of a positively charged poly-L-lysine (PLL) coating resulted in the rectified current with opposite polarity. The results agreed with the theories developed for current-rectifying conical nanopores, suggesting the similar underlying mechanism among asymmetric nanostructure in general. This surface condition dependence can be used as the fundamental principle of multi-purpose real-time in vivo biosensors.

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