Use of tapered Pyrex capillary tubes to increase the mechanical stability of multiwall carbon nanotubes field emitters

2nd International Conference on Advanced Materials

Mousa, M.S.^1 ; Bani Ali, E.S.^2 ; Hagmann, M.J.^3

Department of Physics, Mu'Tah University, Al-Karak

61710, Jordan^1

Surface Physics and Materials Technology Lab, Physics Dept., Mu'Tah University, Al-Karak, Jordan^2

University of Utah, Dept. Electrical and Computer Engineering, Salt Lake City

UT

84112, United States^3

关键词: Catalytic chemical vapor deposition;    Cold field emissions;    Electrically conductive;    Field emitter tips;    Fowler-Nordheim plots;    Glass capillary tubes;    Mechanical support;    Pyrex capillary tube;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/305/1/012026/pdf
DOI  :  10.1088/1757-899X/305/1/012026

来源: IOP

【 摘 要 】

In this study, NanocylTMNC 7000 Thin Multiwall Carbon Nanotubes (MWCNTs) were used with a high aspect ratio (>150) made by the process of catalytic chemical vapor deposition (CCVD). The field emitter tips were prepared by inserting these MWCT into fine glass capillary tubes that were pulled at high temperatures and then cut. Measurements were carried out under ultra-high vacuum (UHV) conditions with a base pressure of 10-9mbar. The data show the effects of initial conditioning of MWCNT and hysteresis. Compression of the MWCNT by the capillary tubes appears to provide adequate mechanical support without requiring the use of a low-melting point electrically-conductive binder as has been used previously. Emission currents in excess of 1 μA were obtained so this technique shows promise as a reliable, stable, powerful electron source.