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Träfflista för sökning "WFRF:(Zou Guangtian) ;pers:(Nyeanchi Emmanuel B.)"

Sökning: WFRF:(Zou Guangtian) > Nyeanchi Emmanuel B.

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1.
  • Liu, Bingbing, et al. (författare)
  • Electric resistance of single-walled carbon nanotubes under hydrostatic pressure
  • 2001
  • Ingår i: Solid State Communications. - : Elsevier B.V.. - 0038-1098 .- 1879-2766. ; 118:1, s. 31-36
  • Tidskriftsartikel (refereegranskat)abstract
    • The electric resistance of single-walled nanotube mats has been studied systematically under both ambient and high hydrostatic pressures up to 1.5 GPa. Both the temperature dependence of the resistance and the magnetoresistance indicate that electrical transport occurs by variable range hopping, apparently in 2D. We suggest that this unexpected dimensionality arises from a fractal network of tubes and bundles. Under hydrostatic pressure (HP) the resistance still shows 2D variable range hopping and decreases with increasing HP. An irreversible increase in localization length and DOS is induced below 0.5 GPa. The behavior is reversible and due to strong interaction of tubes from 0.5 GPa up to 1.05 GPa. These results indicate that 2D variable range hopping occurs within bundles.
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2.
  • Liu, Bingbing, et al. (författare)
  • Synthesis and characterization of single-walled nanotubes produced with Ce as catalyst
  • 2000
  • Ingår i: Molecular Materials: Molecular Crystals and Liquid Crystals Section C, vol. 13. - : Overseas Publishers Association N.V.. ; , s. 75-80
  • Konferensbidrag (refereegranskat)abstract
    • We have studied the effect of using rare-earth elements C (typically +4 oxide state) and Eu (typically +2 oxide state) together with nanometer Ni as catalysts to synthesize SWNT in high yield by arc evaporation. A black collar deposit containing mainly SWNT was formed in the presence of Ce/Ni while only nanometer carbon particles were formed using Eu/Ni, as identified by SEM, TEM and Raman spectra. The Raman spectra of our SWNT mats show difference from spectra shown in the literature in a low frequency range, indicating that our mats contain chiral tubes. The temperature dependent resistance of SWNT mats was also measured. A semiconducting behaviour was observed with a negative dR/dT and no resistance minimum from 2 to 350 K. The resistance follows a 2D variable range hopping behaviour.
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  • Resultat 1-2 av 2
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konferensbidrag (1)
tidskriftsartikel (1)
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refereegranskat (2)
Författare/redaktör
Wågberg, Thomas (2)
Sundqvist, Bertil (2)
Zhu, Xiaomei (2)
Olsson, Eva (2)
Nyeanchi, Emmanu... (2)Ta bort avgränsningen
Liu, Bingbing (2)
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Zou, Guangtian (2)
Yang, H. (1)
Li, D. (1)
Yang, R. (1)
Gao, C (1)
Andersson, Ove (1)
Makarova, Tatiana L. (1)
Li, H.-D. (1)
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Umeå universitet (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)

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