ja211142e_si_001.pdf (1.49 MB)
Transmembrane Potential across Single Conical Nanopores and Resulting Memristive and Memcapacitive Ion Transport
journal contribution
posted on 2012-02-29, 00:00 authored by Dengchao Wang, Maksim Kvetny, Juan Liu, Warren Brown, Yan Li, Gangli WangMemristive and memcapacitive behaviors are observed from
ion transport
through single conical nanopores in SiO2 substrate. In i–V measurements, current is found to depend on not
just the applied bias potential but also previous conditions in the
transport-limiting region inside the nanopore (history-dependent,
or memory effect). At different scan rates, a constant cross-point
potential separates normal and negative hysteresis loops at low and
high conductivity states, respectively. Memory effects are attributed
to the finite mobility of ions as they redistribute within the negatively
charged nanopore under applied potentials. A quantative correlation
between the cross-point potential and electrolyte concentration is
established.