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In living organisms, information is processed in interconnected symphonies ofionic currents spiking through protein ion channels. As a result of dynamicallyswitching their conductive states, ion channels exhibit a variety ofcurrent-voltage nonlinearities and memory effects. Fueled by the promise ofcomputing architectures entirely different from von Neumann, recent attempts toidentify and harness similar phenomena in artificial nanofluidic environmentsfocused on demonstrating analog circuit elements with memory. Here we exploreaqueous ionic transport through two-dimensional (2D) membranes featuring arraysof ion-trapping crown-ether-like pores. We demonstrate that for aqueous saltsfeaturing ions with different ion-pore binding affinities, memristive effectsemerge through coupling between the time-delayed state of the system and itstransport properties. We also demonstrate a nanopore array that behaves as acapacitor with a strain-tunable built-in barrier, yielding behaviors rangingfrom current spiking to ohmic response. By focusing on the illustrativeunderlying mechanisms, we demonstrate that realistically observable memoryeffects may be achieved in nanofluidic systems featuring crown-porous 2Dmembranes.

Memristive response and capacitive spiking in the aqueous ion transport through 2D nanopore arrays