title: Development of TEM and SEM high brightness electron guns using cold-field emission from a carbon nanotip.
abstract: A newly developed carbon cone nanotip (CCnT) has been used as field emission cathode both in low voltage SEM (30 kV) electron source and high voltage TEM (200 kV) electron source. The results clearly show, for both technologies, an unprecedented stability of the emission and the probe current with almost no decay during 1h, as well as a very small noise (rms less than 0.5%) compared to standard sources which use tungsten tips as emitting cathode. In addition, quantitative electric field mapping around the FE tip have been performed using in situ electron holography experiments during the emission of the new tip. These results show the advantage of the very high aspect ratio of the new CCnT which induces a strong enhancement of the electric field at the apex of the tip, leading to very small extraction voltage (some hundred of volts) for which the field emission will start. The combination of these experiments with emission current measurements has also allowed to extract an exit work function value of 4.8 eV.
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: F
authors.initials: F
authors.lastname: Houdellier
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: L
authors.initials: L
authors.lastname: de Knoop
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: C
authors.initials: C
authors.lastname: Gatel
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Masseboeuf
authors.affiliation: Hitachi High-Technologies Corporation, 882, Ichige, Hitachinaka, Ibaraki 312-8504, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Mamishin
authors.affiliation: Hitachi High-Technologies Corporation, 882, Ichige, Hitachinaka, Ibaraki 312-8504, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Taniguchi
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: M
authors.initials: M
authors.lastname: Delmas
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: M
authors.initials: M
authors.lastname: Monthioux
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: M J
authors.initials: MJ
authors.lastname: Hÿtch
authors.affiliation: CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France.
authors.forename: E
authors.initials: E
authors.lastname: Snoeck
keywords: Carbon tips; Electron holography; Electrons sources; Field emission