Electron field emission from screen-printed graphene films

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Electron field emission is crucial for vacuum electronic devices.
• Graphene's unique properties make it a promising material for field emitters.
• Developing scalable and cost-effective fabrication methods for graphene emitters is essential.

Purpose of the Study:

• To investigate the electron field emission performance of screen-printed graphene cathodes.
• To develop a simple and scalable method for fabricating graphene field emitters.
• To evaluate the electrical conductivity and field enhancement factor of the prepared cathodes.

Main Methods:

• High-yield graphene synthesis using a modified Hummers method and hydrazine hydrate reduction.
• Screen printing technique for fabricating graphene field emission cathodes on various substrates.
• Characterization of field emission properties, including threshold field and stability.

Main Results:

• The screen-printed graphene cathode exhibited excellent and stable field emission properties.
• A low threshold field of approximately 1.5 V/µm was achieved.
• The fabricated cathode structure demonstrated good electrical conductivity and a high surface field enhancement factor.
• The method is simple, convenient, and suitable for large-scale production.

Conclusions:

• Screen printing is a viable and scalable technique for fabricating high-performance graphene field emitters.
• The developed method offers a promising pathway for the widespread application of graphene films in field emission devices.
• The study highlights the potential of graphene-based cathodes for advanced electronic applications.