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Quasi-Stable Salt Gradient and Resistive Switching in Solid-State Nanopores
Iat Wai Leong1, Makusu Tsutsui1, Sanae Murayama1
1The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.
ACS Applied Materials & Interfaces
|November 5, 2020
Summary
This study reveals how ion transport in nanopores can exhibit negative differential resistance and resistive switching due to salinity gradients and electro-osmotic flow. These findings are key for developing advanced iontronic and neuromorphic devices.
Area of Science:
- Nanofluidics
- Iontronics
- Solid-state nanopore devices
Background:
- Precise control of ion transport in fluidic channels is essential for iontronics.
- Solid-state nanopores offer a platform for studying ion transport phenomena.
Purpose of the Study:
- To investigate quasi-stable ionic current characteristics in a silicon nitride (SiNx) nanopore under salinity gradients.
- To explore the interplay between electro-osmotic flow and ion density for asymmetric ion transport and novel electronic behaviors.
Main Methods:
- Fabrication of a SiNx nanopore device.
- Application of a significant salinity gradient (100-fold concentration difference).
- Electrochemical measurements to analyze ionic current and voltage responses.
Main Results:
- Observed quasi-stable ionic current with highly asymmetric transport.
- Demonstrated negative differential resistance behavior under specific salinity gradients.
- Reported resistive switching phenomena attributed to voltage-controlled, quasi-stable local ion density states.
Conclusions:
- The interplay of electro-osmotic flow and ion density in nanopores can lead to complex transport phenomena like negative differential resistance and resistive switching.
- These findings provide a foundation for designing novel neuromorphic devices utilizing micro- and nanofluidic channels.
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