Self-embedded nanocrystalline chromium carbides on well-aligned carbon nanotips

Tsai, C. L.; Hsu, J. H.; Chen, C. F.
June 2003
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4337
Academic Journal
Well-aligned carbon nanotips embedded with nanocrystalline chromium carbide were directly grown on a substrate by microwave plasma chemical vapor deposition. These nanomaterials grew up to about 1 μm long and 60 nm in diameter, yielding a high aspect ratio. In comparison between carbon nanotubes with hollow structure, transmission electron microscopy images show its solid body, which is made of graphite along with nanocrystalline chromium carbide on the tip. These nanomaterials perform well in field emission applications with a turn-on field of 1.38 V/μ m and 565 μA/cm[SUP2] at 2.2 V/μm. Our result confirms the possibility of the self-embedded nanocrystalline materials on the top of carbon nanotips.


Related Articles

  • Growth mechanism of carbon nanotube forests by chemical vapor deposition. Louchev, Oleg A.; Sato, Yoichiro; Kanda, Hisao // Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2752 

    Analysis of kinetics processes involved in carbon nanotube (NT) forest growth during chemical vapor deposition suggests that: (i) carbon species are unable to penetrate to the forest bottom whenever the mean free path in gas is much larger than the typical distance between NTs; instead they...

  • Organized assembly of carbon nanotubes. Wei, B.Q.; Vajtai, R.; Ward, J.; Zhang, R.; Ramanath, G.; Ajayan, P.M. // Nature;4/4/2002, Vol. 416 Issue 6880, p495 

    Relates the importance of organized assembly of nanotube structures to build integrated system of electromechanical structures. Use of chemical-vapor deposition (CVD) method to direct the assembly of carbon nanotubes; Application of CVD to align nontubes on catalyst-printed substrate;...

  • Diffusion-controlled kinetics of carbon nanotube forest growth by chemical vapor deposition. Louchev, Oleg A.; Laude, Thomas; Sato, Yoichiro; Kanda, Hisao // Journal of Chemical Physics;4/22/2003, Vol. 118 Issue 16, p7622 

    A detailed theoretical study of carbon nanotube (NT) forest growth by chemical vapor deposition is given, including (i) ballistic mode of carbon species impingement into the NT surface, (ii) the carbon diffusion over NT surface and through the metal nanoparticle, and (iii) the temperature drop...

  • Growth of large periodic arrays of carbon nanotubes. Huang, Z. P.; Carnahan, D. L.; Rybczynski, J.; Giersig, M.; Sennett, M.; Wang, D. Z.; Wen, J. G.; Kempa, K.; Ren, Z. F. // Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p460 

    Large periodic arrays of carbon nanotubes have been grown by plasma-enhanced hot filament chemical vapor deposition on periodic arrays of nickel dots that were prepared by polystyrene nanosphere lithography. A single layer of self-assembled polystyrene spheres was first uniformly deposited on a...

  • Carbon nanotube networks by chemical vapor deposition. Cassell, Alan M.; McCool, Geoff C.; Ng, Hou Tee; Koehne, Jessica E.; Chen, Bin; Li, Jun; Han, Jie; Meyyappan, M. // Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p817 

    We have demonstrated assembly of two- and three-dimensional networks of single-walled carbon nanotubes (SWNTs) using a microsphere assembly approach. The catalyst microcapsules are made from the solution based impregnation of uniform diameter, porous polystyrene microspheres. Chemical vapor...

  • Effect of Structures and Morphologies of Catalyst on Growth of Carbon Nanotubes Synthesized by Chemical Vapor Deposition. Park, Y. J.; Han, I. T.; Kim, H. J.; Lee, N. S.; Jin, Y. W.; Jung, J. E.; Park, C. Y.; Kim, J. M. // AIP Conference Proceedings;2002, Vol. 633 Issue 1, p198 

    This study carried out the synthesis of carbon nanotubes (CNTs) on glass and Si substrates at lower than 550°C by thermal CVD using CO and H[SUB2] gases at an atmospheric pressure. Prior to CNT synthesis, catalyst layers of an Invar (an Fe-Ni-Co alloy) alloy were vacuum-annealed at different...

  • Controlled CVD-growth of multiwalled CNTs. Duesberg, G. S.; Kreupl, F.; Graham, A.; Liebau, M.; Unger, E.; Gabric, Z.; Hönlein, W. // AIP Conference Proceedings;2002, Vol. 633 Issue 1, p157 

    Many applications of carbon nanotubes (CNTs) require a material with defined properties, however most synthesis routes yield CNTs of varying purity, structure, diameter, and length. Chemical vapor deposition (CVD) allows a good control over the CNTs synthesis and leads to promising results,...

  • Temperature selective growth of carbon nanotubes by chemical vapor deposition. Ducati, Caterina; Alexandrou, Ioannis; Chhowalla, Manish; Amaratunga, Gehan A. J.; Robertson, John // Journal of Applied Physics;9/15/2002, Vol. 92 Issue 6, p3299 

    Randomly oriented and vertically aligned carbon nanotubes were synthesized by chemical vapor deposition varying the growth temperature between 550°C and 850°C. Transmission electron microscopy (TEM) was used to investigate the growth process and in particular the role of the Ni catalyst....

  • Hot wire chemical vapor deposition of isolated carbon single-walled nanotubes. Mahan, A. H.; Alleman, J. L.; Heben, M. J.; Parilla, P. A.; Jones, K. M.; Dillon, A. C. // Applied Physics Letters;11/18/2002, Vol. 81 Issue 21, p4061 

    Hot wire chemical vapor deposition (HWCVD) has been employed for the continuous generation of carbon single-walled nanotube (SWNT) materials. Interestingly, transmission electron microscopy analyses revealed only the presence of isolated SWNTs, rather than nanotubes existing in bundles. An...


Read the Article


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

Try another library?
Sign out of this library

Other Topics