Freestanding vertically aligned arrays of individual carbon nanotubes on metallic substrates for field emission cathodes

Mauger, M.; Binh, Vu Thien; Levesque, A.; Guillot, D.
July 2004
Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p305
Academic Journal
Direct growth of individual and vertically aligned carbon nanotubes (CNTs) onto a metallic tip apex using a two-chamber radio-frequency plasma-enhanced chemical vapor deposition is reported. Individual Ni nanocatalysts, obtained by a sol–gel combustion technique, were dots for the nucleation of individual CNTs that were freestanding, clean, and vertically aligned by the presence of a controlled applied field. The arrays of CNTs obtained, having a low-density spatial distribution to avoid mutual electrostatic field screening, gave uniform stable overall field emission patterns after a conditioning process. Effective total current densities up to 1 A/cm2 can be extracted.


Related Articles

  • High current density, low threshold field emission from functionalized carbon nanotube bucky paper. Kakade, Bhalchandra A.; Pillai, Vijayamohanan K.; Late, Dattatray J.; Chavan, Padmakar G.; Sheini, Farid J.; More, Mahendra A.; Joag, Dilip S. // Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p073102 

    Field emission studies of bucky paper of multiwalled carbon nanotubes (MWNTs), prepared after microwave (MW) assisted acid functionalization are reported along with a comparison with that of “as-grown” sample. MW treated bucky papers reveal an interesting linear field emission...

  • Room-temperature fabrication of high-resolution carbon nanotube field-emission cathodes by self-assembly. Oh, S. J.; Cheng, Y.; Zhang, J.; Shimoda, H.; Zhou, O. // Applied Physics Letters;4/14/2003, Vol. 82 Issue 15, p2521 

    In this letter, we report a process for room-temperature assembly of patterned and periodic structures of carbon nanotubes (CNTs). Well-defined patterns with less than a 10-µm linewidth and variable thickness were readily deposited. The CNTs show long-range in-plane orientation ordering and...

  • Operation of individual integrally gated carbon nanotube field emitter cells. Guillorn, M. A.; Hale, M. D.; Merkulov, V. I.; Simpson, M. L.; Eres, G. Y.; Cui, H.; Puretzky, A. A.; Geohegan, D. B. // Applied Physics Letters;10/7/2002, Vol. 81 Issue 15, p2860 

    In this work, we examine the operation of individual field emitter cells contained in a field emitter array composed of integrally gated multiwalled carbon nanotube (MWNT)-based field emission cathodes. These devices were found to behave in a manner consistent with a multiple emission site model...

  • Electron emission from Spindt-like carbon nanotubes field emission cathodes (FECs). CZERWOSZ, ELZBIETA; KOWALSKA, EWA; KOZLOWSKI, MIROSLAW; RYMARCZYK, JOANNA // Optica Applicata;2011, Vol. 41 Issue 2, p289 

    We present field emission characteristics from Spindt-like carbon nanotubes (CNT) films obtained in a two steps method. The two steps method was elaborated in Tele & Radio Research Institute (Poland) and it consists of two independent processes: first, the physical vapour deposition (PVD)...

  • Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes. He, Weidong; Vilayurganapathy, Subramanian; Joly, Alan G.; Droubay, Tim C.; Chambers, Scott A.; Maldonado, Juan R.; Hess, Wayne P. // Applied Physics Letters;2/18/2013, Vol. 102 Issue 7, p071604 

    Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100)...

  • Maximizing the electron field emission performance of carbon nanotube arrays. Smith, R. C.; Silva, S. R. P. // Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p133104 

    The field emission screening effect is one of great importance when aiming to design efficient and powerful cathodes. It has long been assumed that the degrading effect is at a minimum when neighboring emitters are at least twice their height from each other. In this work, we show that the...

  • Polarized electron source operation at average currents of several milliamperes. Barday, R.; Aulenbacher, K. // AIP Conference Proceedings;2007, Vol. 915 Issue 1, p1019 

    The assumption of a constant charge per lifetime of NEA photocathodes was tested at polarized electron currents of several mA. Polarized electrons were produced from bulk GaAs photocathodes by laser illumination with a photon energy close to the band gap. We demonstrate that cathode heating, ion...

  • Carbon velvet field-emission cathode. Shiffler, D.; Ruebush, M.; Haworth, M.; Umstattd, R.; LaCour, M.; Golby, K.; Zagar, D.; Knowles, T. // Review of Scientific Instruments;Dec2002, Vol. 73 Issue 12, p4358 

    Explosive field emission cathodes comprise an important class of cathodes for high power microwave tubes, having the advantages of light weight as well as requiring no heater for electron emission. Generally, however, this class of cathodes suffers from large amounts of outgassing, nonuniform...

  • Investigation of field emission properties of carbon nanotube arrays defined using nanoimprint lithography. Vieira, Sara M. C.; Teo, Kenneth B. K.; Milne, William I.; Gröning, Oliver; Gangloff, Laurent; Minoux, Eric; Legagneux, Pierre // Applied Physics Letters;7/10/2006, Vol. 89 Issue 2, p022111 

    We demonstrate the use of nanoimprint lithography as an alternative low-cost fabrication route for the production of ordered arrays of individual carbon nanotube field emitters. A high emission site density of 4×105 cm-2 was observed and is well within the specification of the cathode for a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics