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

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

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1.
  • Noël, Maxime, et al. (författare)
  • Effects of non-hydrostatic pressure on electrical resistance of bundled single-wall carbon nanotubes
  • 2013
  • Ingår i: 7th EEIGM International Conference on Advanced Materials Research. - : IOP Publishing Ltd.
  • Konferensbidrag (refereegranskat)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. (författare)
  • Electrical transport in bundled single-wall carbon nanotubes under high pressure
  • 2013
  • Konferensbidrag (refereegranskat)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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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Noël, Maxime (2)
Soldatov, Alexander (2)
Mases, Mattias (2)
Volkova, Y. (2)
Zelenovskiy, P. (2)
Babushkin, A. (2)
Lärosäte
Luleå tekniska universitet (2)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2013 (2)Ta bort avgränsningen

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