Authors
Matlabjon Sattorov, Dongpyo Hong, Sun-Hong Min, Young-Jun Jeong, Young Joon Yoo, Sang Yoon Park, Gun-Sik Park
Published in
ACS applied materials & interfaces. Aug 10, 2026. Epub Aug 10, 2026.
Abstract
Cold cathodes offer heater-free, instantly switchable electron sources, but conventional sharp-tip designs often degrade under continuous thermal loads, limiting high-power applications. We overcome this with a freestanding, edge-emitting turbostratic graphene film (GF). Its turbostratic stacked layers are assembled via solution-phase pre-gelation of graphene oxide, followed by thermal restoration and densification. A 300 nm-thick, 1 cm-wide GF emission edge can sustain 1.5 mA (52 A cm-2) DC current for 588 h, with an exceptionally low degradation rate below 0.042% h-1. This durability is an order of magnitude better than previous carbon cathodes at similar current densities. This performance meets critical requirements for modern high-power vacuum electron applications. Our cost-effective, scalable architecture bridges nanoscopic field enhancement with macroscopic heat management, significantly broadening cold cathode applications.
PMID:
42571721
Bibliographic data and abstract were imported from PubMed on 10 Aug 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 8
- Comments 0