Tunable Intervalence Charge Transfer in Ruthenium Prussian Blue Analog Enables Stable and Efficient Biocompatible...

Area of Science:

• Materials Science
• Neuroscience
• Chemistry

Background:

• Neuromorphic computing, bioelectronics, and brain-computer interfaces require novel materials.
• Understanding the link between oxidation state and conductivity is crucial for developing advanced electronic devices.

Purpose of the Study:

• To explore a mixed-valence inorganic 3D coordination framework, a ruthenium Prussian blue analog (RuPBA), for artificial synapses.
• To investigate the electrochemical tunability of RuPBA's conductance and its potential for flexible and biocompatible neuromorphic devices.

Main Methods:

• Synthesis and characterization of a ruthenium Prussian blue analog (RuPBA).
• Electrochemical tuning of oxidation state to control conductance.
• Density functional theory (DFT) computations and in situ spectroscopy to analyze electronic properties.
• Biocompatibility testing with neuronal cells.

Main Results:

• RuPBA demonstrated reversible conductance switching over four orders of magnitude.
• Electrochemical tuning of mixed valency and electronic coupling controlled carrier concentration and mobility.
• Programmed state retention improved by two orders of magnitude compared to organic polymers.
• Dopamine-mediated plasticity and biocompatibility with neuronal cells were observed.

Conclusions:

• RuPBA serves as a promising material for flexible, biocompatible artificial synapses in neuromorphic computing.
• The material's properties offer advantages in reduced error correction costs and energy consumption.
• RuPBA holds potential for advanced brain-computer interfacing applications.