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Journal of Applied Physics / Volume 93 / Issue 4 / NANOSCALE SCIENCE AND DESIGN

J. Appl. Phys. 93, 2157 (2003); http://dx.doi.org/10.1063/1.1536733 (7 pages)

Magnetically aligned single wall carbon nanotube films: Preferred orientation and anisotropic transport properties

J. E. Fischer1, W. Zhou1, J. Vavro1, M. C. Llaguno1, C. Guthy1, R. Haggenmueller1, M. J. Casavant2, D. E. Walters2, and R. E. Smalley2

1Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
2Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77259

(Received 26 August 2002; accepted 18 November 2002)

Thick films of single wall carbon nanotubes (SWNT) exhibiting in-plane preferred orientation have been produced by filter deposition from suspension in strong magnetic fields. We characterize the field-induced alignment with x-ray fiber diagrams and polarized Raman scattering, using a model which includes a completely unaligned fraction. We correlate the texture parameters with resistivity and thermal conductivity measured parallel and perpendicular to the alignment direction. Results obtained with 7 and 26 T fields are compared. We find no significant field dependence of the distribution width, while the aligned fraction is slightly greater at the higher field. Anisotropy in both transport properties is modest, with ratios in the range 5–9, consistent with the measured texture parameters assuming a simple model of rigid rod conductors. We suggest that further enhancements in anisotropic properties will require optimizing the filter deposition process rather than larger magnetic fields. We show that both x-ray and Raman data are required for a complete texture analysis of oriented SWNT materials. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

EDITORIALLY RELATED

  1. Neat macroscopic membranes of aligned carbon nanotubes
    M. J. Casavant et al.
    J. Appl. Phys. 93, 2153 (2003)JAPIAU000093000004002153000001

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KEYWORDS and PACS

Keywords

carbon nanotubes, suspensions, magnetic field effects, Raman spectra, texture, thermal conductivity, electrical resistivity, X-ray diffraction, filtration

PACS

  • 61.46.-w

    Structure of nanoscale materials

  • 73.63.Fg

    Nanotubes

  • 78.67.Ch

    Nanotubes

  • 81.07.De

    Nanotubes

  • 65.80.-g

    Thermal properties of small particles, nanocrystals, nanotubes, and other related systems

  • 78.30.Na

    Fullerenes and related materials

  • 66.70.-f

    Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1536733

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    L. Jin, C. Bower, and O. Zhou, Appl. Phys. Lett. 3, 1197 (1998)APPLAB000073000009001197000001.

    B. W. Smith, Z. Benes, D. E. Luzzi, J. E. Fischer, D. E. Walters, M. J. Casavant, J. Schmidt, and R. E. Smalley, Appl. Phys. Lett. 77, 663 (2000)APPLAB000077000005000663000001.

    J. C. Hone, M. C. Llaguno, N. M. Nemes, J. E. Fischer, D. E. Walters, M. J. Casavant, J. Schmidt, and R. E. Smalley, Appl. Phys. Lett. 77, 666 (2000)APPLAB000077000005000666000001.

    M. J. Casavant, D. A. Walters, J. J. Schmidt, and R. E. Smalley, J. Appl. Phys. 93, 2153 (2003)JAPIAU000093000004002153000001
    previous paper.

    H. H. Gommans, J. W. Alldredge, H. Tashiro, J. Park, J. Magnuson, and A. G. Rinzler, J. Appl. Phys. 88, 2509 (2000)JAPIAU000088000005002509000001.

    E. Anglaret, A. Righi, J. L. Sauvajol, P. Bernier, B. Vigolo, and P. Poulin, Phys. Rev. B 65, 165426 (2002).

    J. E. Fischer, H. Dai, A. Thess, R. Lee, N. M. Hanjani, D. DeHaas, and R. E. Smalley, Phys. Rev. B 55, R4921 (1997).

    G. U. Sumanasekera, C. K. W. Adu, S. Fang, and P. C. Eklund, Phys. Rev. Lett. 85, 1096 (2000).

    M. C. Llaguno, J. Hone, A. T. Johnson, and J. E. Fischer, in Molecular Nanostructures, edited by H. Kuzmany, J. Fink, M. Mehring, and S. Roth, AIP Conf. Proc. No. 591 (AIP, New York, 2001), p. 384.


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