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A mechano-gated ionic diode enables low-power synaptic tactile spiking
Yong Min Kim1, Hanbin Choi2, Ji Hong Kim2
1Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
Science Advances
|December 10, 2025
Summary
Researchers developed a mechano-gated ionic diode using copolymer engineering for balanced ion transport. This innovation enables efficient, low-power ionic sensing and neuromorphic applications with enhanced signal-to-noise ratios.
Area of Science:
- Materials Science
- Nanotechnology
- Ionics
Background:
- Ionic diodes are crucial for ionotronic systems but face challenges with ion pairing at high concentrations.
- Conventional designs struggle to form stable ion depletion layers (IDLs), limiting performance.
Purpose of the Study:
- To engineer a mechano-gated ionic diode with balanced ionic conductivity for improved IDL formation.
- To achieve high rectification ratios and pressure-sensitive piezo-ionic behavior.
- To explore low-power ionic sensing and neuromorphic functionalities.
Main Methods:
- Utilized copolymer engineering to achieve balanced ionic conductivity in cationic and anionic polymer layers.
- Fabricated a mechano-gated ionic diode device.
- Investigated the device's rectification ratio, piezo-ionic response, and energy consumption.
Main Results:
- Achieved a record-high rectification ratio of 23.5 due to well-defined IDLs.
- Demonstrated pressure-sensitive piezo-ionic behavior with threshold-gated current modulation.
- Reported ultra-low energy consumption per ionic spike (0.41 nJ at rest, 1.49 nJ under pressure).
- Observed synaptic-like plasticity and activity-dependent signal encoding in a tactile interface.
Conclusions:
- The developed ionic diode offers a material-driven strategy for adaptive and energy-efficient ionotronic systems.
- The device enables real-time, low-power ionic sensing and exhibits potential for neuromorphic computing.
- Balanced ionic conductivity is key to overcoming limitations of conventional ionic diodes.
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