PEDOT:PSS Wire: A Two-Terminal Synaptic Device for Operation in Electrolyte and Saline Solutions
Seiya Watanabe1, Hiroaki Shibakita2, Naruki Hagiwara3
1Graduate School of Science, Department of Chemistry, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
ACS Applied Materials & Interfaces
|September 30, 2024
Summary
Asymmetric poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) wires function as two-terminal synaptic devices in various electrolyte solutions, including phosphate-buffered saline (PBS). Their synaptic conductance changes are tunable for machine learning applications, even in wet conditions.
Area of Science:
- Neuromorphic Engineering
- Materials Science
- Biomedical Engineering
Background:
- Synaptic devices emulate neuronal function for neuromorphic hardware.
- Most current devices are three-terminal; two-terminal devices offer simpler integration.
- Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) shows promise due to biocompatibility, but its performance in physiological solutions is unknown.
Purpose of the Study:
- To investigate the synaptic functions of asymmetric PEDOT:PSS wires in various aqueous electrolyte solutions.
- To explore the impact of environmental conditions on synaptic device performance.
- To assess the suitability of PEDOT:PSS wires for clinical applications.
Main Methods:
- Fabrication of asymmetric PEDOT:PSS wires via additional polymerization.
- Testing synaptic functions in different electrolyte solutions, including phosphate-buffered saline (PBS).
- Analyzing conductance changes and their correlation with electrolyte ion properties and wire asymmetry.
Main Results:
- Synaptic conductance changes were observed in all tested aqueous electrolyte solutions.
- A relationship between conductance change behavior and electrolyte ion properties was identified.
- The waveform of conductance change could be controlled by adjusting wire asymmetry.
Conclusions:
- Asymmetric PEDOT:PSS wires exhibit tunable synaptic functions in diverse electrolyte solutions, including PBS.
- These devices show potential for machine learning applications under physiological conditions.
- PEDOT:PSS wires are promising candidates for biocompatible, two-terminal synaptic devices in clinical settings.
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