TITLE

Imaging temperature-dependent field emission from carbon nanotube films: Single versus multiwalled

AUTHOR(S)
Gupta, S.; Wang, Y. Y.; Garguilo, J. M.; Nemanich, R. J.
PUB. DATE
February 2005
SOURCE
Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p063109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Field emission properties of vertically aligned single- and multiwalled carbon nanotube films at temperatures up to 1000 °C are investigated by electron emission microscopy, enabling real-time imaging of electron emission to provide information on emission site density, the temporal variation of the emission intensity, and insight into the role of adsorbates. The nanotube films showed an emission site density of 104∼105/cm2, which is compared to the areal density (from 1012–1013/cm2 to 108–109/cm2). At ambient temperature, the emission indicated temporal fluctuation (∼6%–8%) in emission current with minimal changes in the emission pattern. At elevated temperatures, the emission site exhibited an increase in emission site intensity. From the experimental observations, it is proposed that the chemisorbed molecules tend to desorb presumably at high applied electric fields (field-induced) in combination with thermal effects (thermal-induced) and provide a contrasting comparison between semiconducting (single-walled) and metallic (multiwalled) nanotubes.
ACCESSION #
16345454

 

Related Articles

  • Modification of the tungsten carbide field emitter surface to localize the electron and ion emission. Golubev, O. // Technical Physics;Jun2011, Vol. 56 Issue 6, p859 

    Using field emission microscopy, the shape modification of the tungsten carbide emitter simultaneously exposed to high electric fields and high temperatures is studied. It is shown that in this case the emitter shape changes observed on the emitter surface are the same as those observed in the...

  • The influence of temperature and electric field on field emission energy distribution of an individual single-wall carbon nanotube. Ping Wu; Huang, N. Y.; Deng, S. Z.; Liang, S. D.; Jun Chen; Xu, N. S. // Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263105 

    The influence of temperature and electric field on field emission energy distribution (FEED) is studied. It is found that higher temperature energizes more higher-energy electrons. FEED peaks shift toward low energy linearly with the increase in applied voltage because of the electric field...

  • Highly-ordered nitrogen doped carbon nanotube novel structures of aligned carpet for enhanced field emission properties. Padya, Balaji; Jain, P. K.; Padmanabham, G.; Ravi, M.; Bhat, K. S. // AIP Conference Proceedings;Jun2013, Vol. 1538 Issue 1, p196 

    Substitutional nitrogen doped aligned carbon nanotubes (NACNTs) with uniform height and high packing density of arrays was synthesized by using the liquid injection CVD process. Transmission electron micrographs indicated that the NACNTs are having nano-bell morphology of graphene layers with...

  • Field emission of carbon nanotubes grown on carbon cloth. Jo, S. H.; Wang, D. Z.; Huang, J. Y.; Li, W. Z.; Kempa, K.; Ren, Z. F. // Applied Physics Letters;8/2/2004, Vol. 85 Issue 5, p810 

    Field emission from carbon nanotubes grown on carbon cloth has been studied. An extremely low electric field of less than 0.4 V/μm is required to reach an emission current density of 1 mA/cm2. This ultralow operating electric field of carbon nanotubes grown on carbon cloth is mainly due to a...

  • Deterministic fabrication of carbon nanotube probes using the dielectrophoretic assembly and electrical detection. Lim, Donghyun; Kwon, Soongeun; Lee, Jonghyun; Shim, Hyung Cheoul; Lee, Hyung Woo; Kim, Soohyun // Review of Scientific Instruments;Oct2009, Vol. 80 Issue 10, p105103 

    We report the controlled dielectrophoretic assembly for the deterministic fabrication of carbon nanotube (CNT) probes. Electrical detection was applied to the dielectrophoretic assembly of CNT probes. Dielectrophoretic manipulation with an ac electric field of 5 MHz was used to form the CNT...

  • In situ observation of field emissions from an individual carbon nanotube by Lorenz microscopy. Fujieda, T.; Hidaka, K.; Hayashibara, M.; Kamino, T.; Matsumoto, H.; Ose, Y.; Abe, H.; Shimizu, T.; Tokumoto, H. // Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5739 

    In situ observation of field emissions from an individual carbon nanotube (CNT) was performed by Lorenz microscopy. A bright spot appeared by Lorenz microscopy at the end of the CNT tip during field emission. The bright spot is assumed to be related to the emission site on the CNT. A drastic...

  • Resonant tunneling and extreme brightness from diamond field emitters and carbon nanotubes. Jarvis, J. D.; Andrews, H. L.; Ivanov, B.; Stewart, C. L.; de Jonge, N.; Heeres, E. C.; Kang, W.-P.; Wong, Y.-M.; Davidson, J. L.; Brau, C. A. // Journal of Applied Physics;Nov2010, Vol. 108 Issue 9, p094322 

    We report new results from field emission microscopy studies of multiwall carbon nanotubes and from energy spectrum measurements of beams from diamond field emitters. In both systems, we find that resonant tunneling through adsorbed species on the emitter surface is an important and sometimes...

  • Optimization of the parameters of a carbon nanotube-based field-emission cathode. Bocharov, G.; Eletskii, A.; Sommerer, T. // Technical Physics;Apr2011, Vol. 56 Issue 4, p540 

    procedure for optimizing a field-emission cathode based on carbon nanotubes (CNTs) is developed. An array of identical equidistant vertical CNTs is considered. The optimization procedure takes into account the effect of screening of an electric field by neighboring nanotubes by solving a Laplace...

  • Electron field emission from room temperature grown carbon nanofibers. Smith, R. C.; Carey, J. D.; Poa, C. H. P.; Cox, D. C.; Silva, S. R. P. // Journal of Applied Physics;3/15/2004, Vol. 95 Issue 6, p3153 

    The observation of field induced electron emission from room temperature grown carbon nanofibers at low (5 V/μm) macroscopic electric fields is reported. The nanofibers were deposited using methane as a source gas in a conventional rf plasma enhanced chemical vapor deposition reactor using a...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics