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Träfflista för sökning "WFRF:(Volkova A. P.) srt2:(2013)"

Search: WFRF:(Volkova A. P.) > (2013)

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1.
  • Noël, Maxime, et al. (author)
  • Effects of non-hydrostatic pressure on electrical resistance of bundled single-wall carbon nanotubes
  • 2013
  • In: 7th EEIGM International Conference on Advanced Materials Research. - : IOP Publishing Ltd.
  • Conference paper (peer-reviewed)abstract
    • Recent studies have shown that single wall carbon nanotubes (SWCNT) exhibit a sequence of phase transitions and demonstrate a high structural stability up to 35 GPa of quasi-hydrostatic pressure [1] beyond which an irreversible structural transformation occurs. Here we report on the study of electrical resistance of SWCNTs at pressures up to 34 GPa in the temperature range of 293 – 395 K. In the pressure range 10–25 GPathe rate of resistance change decreases considerably. We associate such behavior of the resistance with a structural modification of the SWCNTs or/and change of the conductivity character at high pressure. Raman spectra of the samples recovered after 30 GPa exhibit a large increase of defect concentration in the CNTs. Isobaric temperature dependences of the CNT resistance R(T) measured in the temperature range 300–400 K reveal some changes with pressure whereas the semiconducting character of the R(T) remains unaltered.
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2.
  • Noël, Maxime, et al. (author)
  • Electrical transport in bundled single-wall carbon nanotubes under high pressure
  • 2013
  • Conference paper (peer-reviewed)abstract
    • According to recent experimental data single wall carbon nanotubes (SWCNT) exhibit a sequence of phase transitions and demonstrate a high structural stability up to 35 GPa of non-hydrostatic pressure beyond which an irreversible transformation occurs. Here we report a study of electrical transport in SWCNTs at pressures up to 45 GPa in the temperature range of 300 - 400K. High pressure was generated in diamond anvil cell. The anvils are made of electrically conducting "carbonado"-type synthetic diamond. In the pressure range 10-25 GPa the CNT electrical resistance decreases considerably, whereas above 25 GPa it remains essentially unchanged. Such behaviour of the resistance can be connected to a structural modification of the SWCNTs accompanied by change of the conductivity character at high pressure. Raman spectra of the samples recovered after 30 GPa exhibit a large increase of D/G band intensity ratio. The Radial Breathing Mode part of the spectra remains essentially unaltered which testifies for structural integrity of the nanotubes after exposure to high non-hydrostatic pressure and lack of covalent interlinking between the tubes. Pressure dependences of resistance, activation energy for conductivity and charge carriers mobility were determined and discussed.
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  • Result 1-2 of 2
Type of publication
conference paper (2)
Type of content
peer-reviewed (2)
Author/Editor
Noël, Maxime (2)
Soldatov, Alexander (2)
Mases, Mattias (2)
Volkova, Y. (2)
Zelenovskiy, P. (2)
Babushkin, A. (2)
University
Luleå University of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2013 (2)Undo refine

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