期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 46, 页码 52175-52181出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15538
关键词
electro-osmosis; ion transport; negative differential resistance; salt gradient; resistive switching
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19 K22108, 19H00852]
Understanding and control of ion transport in a fluidic channel is of crucial importance for iontronics. The present study reports on quasi-stable ionic current characteristics in a SiNx nanopore under a salinity gradient. An intriguing interplay between electro-osmotic flow and local ion density distributions in a solid-state pore is found to induce highly asymmetric ion transport to negative differential resistance behavior under a 100-fold difference in the cross-membrane salt concentrations. Meanwhile, a subtle change in the salinity gradient profile led to observations of resistive switching. This peculiar characteristic was suggested to stem from quasi-stable local ion density around the channel that can be switched between two distinct states via the electro-osmotic flow under voltage control. The present findings may be useful for neuromorphic devices based on micro- and nanofluidic channels.
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