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Giant and Programmable Ionic Rectification Induced by Voltage-Driven Dynamic Modulation of Interfacial Electric
Xi Wang1,2, Yifan Guo1,2, Tianyun Jing1,2
1School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nano Letters
|February 11, 2026
Summary
Researchers developed a unipolar ionic diode using hydrogel nanochannels to control proton transport, achieving a high rectification ratio for advanced human-computer interaction and neuromorphic devices.
Area of Science:
- Nanotechnology
- Materials Science
- Biophysics
Background:
- Artificial ionic diodes are vital for human-computer interaction, but current designs suffer from leakage current and inefficient unidirectional ion transport.
- Effective blocking in the closed state remains a challenge for existing artificial ion channels.
Purpose of the Study:
- To construct a unipolar ionic diode capable of regulating unidirectional proton transport.
- To overcome leakage current limitations in artificial ionic diodes.
Main Methods:
- Engineered hierarchical hydrogel nanochannels incorporating light-responsive spiropyran derivatives.
- Modulated the formation of an asymmetric electric double layer at the insulator-hydrogel interface via applied voltage.
Main Results:
- Achieved a record-high ionic rectification ratio of 4 × 105, indicating highly efficient unidirectional proton transport.
- Successfully constructed a photonic synaptic transistor demonstrating superior current modulation and optical synaptic plasticity.
- Showcased voltage-dependent ion-to-electron signal transduction capabilities.
Conclusions:
- The developed unipolar ionic diode effectively regulates proton transport, addressing key limitations of existing artificial channels.
- This technology advances bioinspired nanofluidic ionotronics for potential applications in neuromorphic devices and wireless communication.
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