Surface modification of field emission cathodes made of artificial carbon-based material

While the field emission acts at the technical vacuum level conditions (10-5 Pa) and electrons emitted from cathode, the ion bombardment exists and continuously modifies the cathode surface. Using X-ray photoelectron spectroscopy (XPS) we studied the electronic structure of thin surface layer of artificial carbon-based materials (ACB) used as field emission cathodes (FEC). The research resulted in the spectra of the samples B-1300, B-1500, B-1900. After spectra processing features analysis shows the change in type of hybridization of the original material. This change is supported by three characteristic spectral features: asymmetry of the core levels spectrum lines change, the satellite structure transformation, Auger-line and modification. So the initial material had sp2 type of hybridization, the spectra show that in thin surface layer a new phase with sp3-hybridization exists and we can conclude formation of nanoclusters with diamond-phase in thin surface layer of cathode. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

XPS studies on surfaces of field-emission cathodes of artificial carbon materials

The electronic structure of the surface layer of artificial carbon-based materials operated as field emission cathodes was studied using x-ray photoelectron spectroscopy. Samples B-1300, B-1500, and B-1900 were investigated. An analysis of the spectra showed an alteration of the hybridization of atoms in the original material, which suggested the formation of diamond-like inclusions on the sample surface. © 2013 Springer Science+Business Media New York