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In weakly buckled carbon nanotubes, the kink is an open, ovalizedconstriction where molecular-sized analytes and ions can pass. Moreover, insemiconducting tubes, the kink has an electronic bound state within thebandgap. This state is localized, hence highly susceptible to electrostaticperturbation by a proximate, itinerant ion. The degree to which thisperturbation will modulate the electronic current, which is our signal, can bemaximized in a tunnel-junction set-up, near resonance. We thus propose such adevice, analyze its performance and, since the bound state depends on thepost-buckling bending, suggest a scalable fabrication method to achieve bendingand buckling of carbon nanotubes to an adjustable degree.

Nanopore and tunneling resonance in an open kink in carbon nanotubes