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Nano Lett. 2006 Nov;6(11):2486-92.

Current rectification with poly-l-lysine-coated quartz nanopipettes.

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  • 1Stanford Genome Technology Center, Department of Biochemistry, Stanford University School of Medicine, Stanford University, 855 California Avenue, Palo Alto, California 94304, USA.


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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