S-Layer Protein for Resistive Switching and Flexible Nonvolatile Memory Device.

Area of Science:

• Materials Science
• Biotechnology
• Electronics Engineering

Background:

• Flexible electronics require novel materials for advanced functionalities.
• Resistive switching memory offers potential for high-density data storage.
• Biocompatible materials are crucial for wearable and implantable devices.

Purpose of the Study:

• To demonstrate a novel flexible resistive switching memory device utilizing S-layer protein (Slp).
• To investigate the memory characteristics, stability, and potential applications of the Slp-based device.
• To explore the feasibility of Slp for biocompatible wearable electronics.

Main Methods:

• Fabrication of an Aluminum/S-layer protein/Indium Tin Oxide/Polyethylene Terephthalate device.
• Characterization of resistive switching behavior, including endurance and retention time.
• Assessment of device performance under mechanical bending stress.

Main Results:

• The device exhibited stable bistable switching between low resistive state (LRS) and high resistive state (HRS).
• Achieved a long retention time (>4 × 10³ s) and stability over 500 cycles with a significant HRS/LRS ratio.
• Demonstrated consistent performance after >100 bending cycles, indicating suitability for flexible applications.

Conclusions:

• S-layer protein is a viable material for flexible resistive switching memory devices.
• The developed device shows promise for biocompatible wearable electronics and storage applications.
• The memory mechanism is attributed to trapping/de-trapping processes within the S-layer protein.