Integration of Vertical Graphene Onto a Tunnelling Cathode for Digital X-Ray Imaging.

ABSTRACT: As an alternative to thermionic X-ray generators, cold-cathode X-ray tubes are being developed for portable and multichannel tomography. Field emission propagating from needle structures such as carbon nanotubes or Si tips currently dominates related research and development, but various obstacles prevent the widespread of this technology. An old but simple electron emission design is the planar tunnelling cathode using a metal-oxide-semiconductor (MOS) structure, which achieves narrow beam dispersion and low supplying voltage. Directly grown vertical graphene (VG) is employed as the gate electrode of MOS and tests its potential as a new emission source. The emission efficiency of the device is initially ≈1% because of unavoidable fabrication damage during the patterning processes; it dras

SUBMITTER: Jerng SK 

PROVIDER: S-EPMC11497061 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature