Title :
Influence of gas atmosphere during laser surface treatment of CNT cathode
Author :
Rochanachirapar, W. ; Murakami, Kazuki ; Yamasaki, N. ; Abo, S. ; Wakaya, F. ; Takai, M. ; Hosono, A. ; Okuda, S.
Author_Institution :
Res. Center for Mater. Sci. at Extreme Conditions, Osaka Univ., Japan
Abstract :
The I-V characteristics of carbon nanotube (CNT) cathodes after laser irradiation in air, N2 and O2 atmospheres have been compared to investigate the influence of each component of air. The I-V characteristic of CNT cathodes irradiated in O2 was drastically improved, while there was almost no improvement in I-V characteristics irradiated in N2. The O2 pressure dependence during laser irradiation to CNT cathodes was also examined. The emission current density at an applied field of 6.6 V/μm was increased by a factor of 200 for laser irradiation in air. The emission current was enhanced by a factor of 400 for laser irradiation in 105 Pa of O2 and the number of emission sites was drastically increased. The emission current density increased with an increase in pressure. The mechanism for drastic improvement in electron emission by UV laser irradiation is via laser-induced oxidation.
Keywords :
carbon nanotubes; cathodes; field emission; laser beam effects; oxidation; sorption; surface treatment; ultraviolet radiation effects; 100 kPa; C; CNT cathode; I-V characteristics; carbon nanotube cathode; emission current density; emission sites; gas atmosphere influence; laser irradiation; laser surface treatment; laser-induced oxidation; Atmosphere; Cathodes; Current density; Electron emission; Gas lasers; Laser theory; Materials science and technology; Printing; Surface emitting lasers; Surface treatment;
Conference_Titel :
Vacuum Nanoelectronics Conference, 2004. IVNC 2004. Technical Digest of the 17th International
Print_ISBN :
0-7803-8397-4
DOI :
10.1109/IVNC.2004.1354941
