3 years ago

Electron-Transfer Gated Ion Transport in Carbon Nanopipets

Electron-Transfer Gated Ion Transport in Carbon Nanopipets
Michael V. Mirkin, Dengchao Wang
Coating the inner wall of a quartz nanopipet with a thin layer of carbon yields a nanopore with tunable surface charge and chemical state for resistive-pulse and rectification sensing. Herein we report the experimental study and modeling of the electron-transfer gated ion transport processes in carbon nanopipets. The potential of the unbiased carbon layer can be tuned by adding very low (sub-nM) concentrations of redox species to the solution via bipolar electrochemistry. The potential of the carbon layer determines the electrical double-layer structure that, in turn, affects the ionic transport processes. The ion current rectification decreased when redox species with a relatively positive formal potential (e.g., Fe(CN)63/4–) were added to the solution and increased upon adding redox species with a negative formal potential (e.g., Ru(NH3)63/2+). Additionally, the ion current displays high sensitivity to redox species, suggesting the possibility of trace-level analysis.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b05058

DOI: 10.1021/jacs.7b05058

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