TITLE

Application of electrostatic Langmuir probe to atmospheric arc plasmas producing nanostructures

AUTHOR(S)
Shashurin, A.; Li, J.; Zhuang, T.; Keidar, M.; Beilis, I. I.
PUB. DATE
July 2011
SOURCE
Physics of Plasmas;Jul2011, Vol. 18 Issue 7, p073505
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The temporal evolution of a high pressure He arc producing nanotubes was considered and the Langmuir probe technique was applied for plasma parameter measurements. Two modes of arc were observed: cathodic arc where discharge is supported by erosion of cathode material and anodic arc which is supported by ablation of the anode packed with carbon and metallic catalysts in which carbon nanotubes are synthesized. Voltage-current (V-I) characteristics of single probes were measured and unusually low ratio of saturation current on positively biased probe to that on negatively biased of about 1-4 was observed. This effect was explained by increase of measured current at the negatively biased probe above the level of ion saturation current due to secondary electron emission from the probe surface. Since utilization of standard collisionless approach to determine plasma parameters from the measured V-I characteristic is not correct, the electron saturation current was used to estimate the plasma density.
ACCESSION #
63542394

 

Related Articles

  • Field emission from a single carbon nanofiber at sub 100 nm gap. Sim, H. S.; Lau, S. P.; Ang, L. K.; You, G. F.; Tanemura, M.; Yamaguchi, K.; Zamri, M.; Yusop, M. // Applied Physics Letters;7/14/2008, Vol. 93 Issue 2, p023131 

    The authors report the electron field emission from a single carbon nanofiber (CNF) over a range of anode to CNF tip separations of 20–5500 nm. Our results show that the field enhancement factor γ is associated with the electrode separation (S). The modified Miller equation is a...

  • Optical feedback mechanisms in laser induced growth of carbon nanotube forests. Bock, M. C. D.; Denk, R.; Wirth, C. T.; Goldberg-Oppenheimer, P.; Hofmann, S.; Baumberg, J. J. // Applied Physics Letters;1/2/2012, Vol. 100 Issue 1, p013112 

    We study optical feedback mechanisms occurring during growth of multi-walled carbon nanotube forests on transparent substrates. Growth is realised via laser-induced chemical vapour deposition using iron nanoparticle catalysts. In situ Raman and reflection spectroscopy employed clearly...

  • Evolution of high aspect ratio and nano-grass structures using a modified low plasma density reactive ion etching. Mehran, M.; Kolahdouz, Z.; Sanaee, Z.; Azimi, S.; Mohajerzadeh, S. // European Physical Journal - Applied Physics;Jul2011, Vol. 55 Issue 1, pN.PAG 

    We report a modified deep reactive ion etching method to realize high aspect ratio features and nano-grasses on silicon substrates. This etching technique uses sequential etching and passivation sub-cycles and it is based on three gases of H2, O2 and SF6 in the presence of rf-plasma. By...

  • Nanoscale wire formation on sputter-eroded surfaces. Kim, J.; Kahng, B.; Barabási, A.-L. // Applied Physics Letters;11/4/2002, Vol. 81 Issue 19, p3654 

    Rotated ripple structures (RRS) on sputter-eroded surfaces are potential candidates for nanoscale wire fabrication. We show that the RRS can form when the width of the collision cascade in the longitudinal direction is larger than that in the transverse direction and the incident angle of ion...

  • Low-Dimensional Carbon Nanomaterials: Synthesis, Properties, and Applications. Sulin Zhang; Teng Li; Jianyu Huang; Shenoy, Vivek // Journal of Nanomaterials;2011, p1 

    An introduction is presented in which the editor discusses various reports within the issue on topics including low-dimensional carbon nanomaterials and their electrical properties.

  • Nanomaterial Interactions with Biological Systems: Implications for Occupational Health. Iavicoli, Ivo; Schulte, Paul A.; Iavicoli, Sergio // Journal of Nanomaterials;2012, p1 

    An introduction is presented in which the editor discusses various reports within the issue on topics including on the effects of OH-functionalized multiwalled carbon nanotubes, evaluation of the toxic effects induced by nanoparticles and biological monitoring of exposure and the development of...

  • Erratum: 'Ion irradiation of electronic-type-separated single wall carbon nanotubes: A model for radiation effects in nanostructured carbon' [J. Appl. Phys. 112, 034314 (2012)]. Rossi, Jamie E.; Cress, Cory D.; Helenic, Alysha R.; Schauerman, Chris M.; DiLeo, Roberta A.; Cox, Nathanael D.; Messenger, Scott R.; Weaver, Brad D.; Hubbard, Seth M.; Landi, Brian J. // Journal of Applied Physics;Dec2012, Vol. 112 Issue 11, p119901 

    A correction to the article "Ion Irradiation of Electronic-Type-Separated Single Wall Carbon Nanotubes: A Model for Radiation Effects in Nanostructured Carbon," by Jamie E. Rossi et al. that was published in 2012 is presented.

  • Precise total electron yield measurements for impact of singly or multiply charged ions on clean solid surfaces. Eder, H.; Vana, M.; Aumayr, F.; Winter, H.P. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p165 

    Describes precise measurements of total electron yields for ion-induced electron emission from a clean polycrystalline gold surface under perpendicular impact of singly and multiply charged ions at impact energies from practically 0 up to 40 keV times primary ion charge. Determination of...

  • Computational studies on ion source plasmas of the neutral beam injection system. Kashiwagi, M.; Ido, S.; Okumura, Y. // Review of Scientific Instruments;Feb2000, Vol. 71 Issue 2, p747 

    Focuses on development of a three-dimensional particle code taking into account the collision terms between fast electrons and hydrogen molecules. Calculation of elastic, ionization, excitation, and vibrational excitation collisions; Application of the code into an ion source of the neutral...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics