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Sökning: L773:9781558999442

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1.
  • Liu, Bingbing, et al. (författare)
  • High pressure and high temperature induced polymeric C60 nanorods and their photoluminiscence properties.
  • 2007
  • Ingår i: Materials Research at High Pressure. - Warrendale : Maerials Research Society. - 9781558999442 ; , s. 99-103
  • Konferensbidrag (refereegranskat)abstract
    • We report that C60 nanorods of three polymeric phases have been synthesized under high pressure and high temperature and that the photoluminescence properties of these polymeric nanorods also have been studied. C60 nanorods were fabricated by a facile solution evaporation method. Raman spectra indicate that this material transformed into orthorhombic, tetragonal and rhombohedral polymeric phases under various high pressure and high temperature conditions. SEM measurements show that the shape of the nanorods can be kept under quasi-hydrostatic pressure condition. The photoluminescence intensity of the polymeric C60 nanorods has been enhanced compared with that of the pristine C60 nanorods. The main fluorescence band shifted from 1.70 eV in the monomeric phase to near infrared in the polymeric phase when pressure and temperature were increased. The enhanced fluorescence with adjustable frequency for different polymeric C60 nanorods makes possible potential application in luminescent nanomaterials.
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2.
  • Sundqvist, Bertil, et al. (författare)
  • High pressure studies of the rotor-stator compound C60-cubane.
  • 2007
  • Ingår i: Materials Research at High Pressure. - Warrendale : Materials Research Society. - 9781558999442 ; , s. 0987-PP03
  • Konferensbidrag (refereegranskat)abstract
    • Insertion of cubane (C8H8) into the octahedral voids of the C60 lattice leads to the formation of an interesting rotor-stator compound which can be converted into a C60 co-polymer by heating. We have treated a number of C60C8H8 samples for up to 3 h each in the range 380-875 K under pressures up to 2 GPa. The resulting materials were investigated by Raman spectroscopy and X-ray diffraction. Depending on treatment conditions, at least five different structural phases can be found. In addition to the four structural phases observed at atmospheric pressure and different temperatures we find that a new polymeric state is created at pressures above 1 GPa, and we tentatively identify its structure as pseudo-orthorhombic. The cubic-orthorhombic phase transition line is found to have a slope of 295 K GPa-1, much larger than the slope of the fcc-sc line in pure C60.
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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag (2)
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refereegranskat (2)
Författare/redaktör
Sundqvist, Bertil (2)
Wang, Lin (1)
Liu, Bingbing (1)
Iwasiewicz-Wabnig, A ... (1)
Kováts, Éva (1)
Pekker, Sándor (1)
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Hou, Yuanyuan (1)
Zou, Guangtian (1)
Iwasiewicz, Agnieszk ... (1)
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Umeå universitet (2)
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Engelska (2)
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Naturvetenskap (2)
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2007 (2)

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