Conjugated polymer covalently modified graphene oxide quantum dots for ternary electronic memory devices

Area of Science:

• Materials Science
• Nanotechnology
• Organic Electronics

Background:

• Graphene oxide quantum dots (GOQDs) show promise for new memory materials due to altered electronic properties upon size reduction.
• Reduced GOQDs exhibit decreased electron affinity and ionization potential, with an elevated LUMO energy level, indicating weaker electron-withdrawing capability compared to graphene oxide.
• This electronic modification is crucial for developing next-generation electronic devices.

Purpose of the Study:

• To synthesize and characterize a novel arylamine-based polyazomethine covalently functionalized graphene oxide quantum dots (TPAPAM-GOQDs).
• To fabricate and evaluate a ternary memory device utilizing TPAPAM-GOQDs.
• To explore the potential of TPAPAM-GOQDs in enhancing memory device capacity.

Main Methods:

• Synthesis of TPAPAM-GOQDs via an amidation reaction.
• Fabrication of a ternary memory device with a gold/TPAPAM-GOQDs/indium tin oxide configuration.
• Characterization of device performance using current-voltage measurements and in situ conductive atomic force microscopy.

Main Results:

• The fabricated ternary memory device demonstrated a distinct multi-state switching behavior with an OFF:ON-1:ON-2 current ratio of 1:60:3000.
• In situ conductive atomic force microscopy confirmed the conductive nature and switching characteristics of the TPAPAM-GOQDs.
• The device exhibited potential for increasing memory capacity from 2^n to 3^n compared to binary memory systems.

Conclusions:

• TPAPAM-GOQDs are effectively synthesized and functionalized for memory applications.
• The developed ternary memory device shows promising multi-state storage capabilities.
• This research paves the way for higher-density data storage solutions using functionalized graphene quantum dots.