New surface coating technology increases materials' electron emission seven-fold

https://phys.org/news/2023-05-surface-coating-technology-materials-electron.html

"high-efficiency electron sources, electron microscopes, electron beam lithography and synchrotron radiation facilities...  thermally stable high melting point and robust hexagonal boron nitride... coating LaB6 with hBN lowered the work function from 2.2 eV to 1.9 eV and increased electron emission... lower work function compared to non-coated and graphene coated regions"