Evidence is presented for the formation of a solid phase based on the smallest fullerene, C20, in thin diamond-like carbon films deposited by ultraviolet laser ablation from diamond onto nickel substrates at room temperature in the presence of 10-4 torr of cyclohexane or benzene. Laser desorption mass spectrometry from the films shows the presence of C 20, C21 and C22 species, while micro-Raman spectroscopy and electron diffraction from selected particles together with first principle density-functional calculations, indicate a cubic solid with dodecahedral C20 cages as building blocks. Unlike solid C 60 and fully protonated C20, which are bound by van der Waals forces, the proposed structure is stabilized by linking of the C 20 dodecahedra, with bridging carbon atoms at interstitial tetrahedral sites to form a face-centered-cubic lattice with 22 carbon atoms per unit cell. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003
Iqbal, Z., Zhang, Y., Grebel, H., Vijayalakshmi, S., Lahamer, A., Benedek, G., et al. (2003). Evidence for a solid phase of dodecahedral C 20. THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS, 31(4), 509-515 [10.1140/epjb/e2003-00060-4].
Evidence for a solid phase of dodecahedral C 20
Benedek, G;Bernasconi, M;
2003
Abstract
Evidence is presented for the formation of a solid phase based on the smallest fullerene, C20, in thin diamond-like carbon films deposited by ultraviolet laser ablation from diamond onto nickel substrates at room temperature in the presence of 10-4 torr of cyclohexane or benzene. Laser desorption mass spectrometry from the films shows the presence of C 20, C21 and C22 species, while micro-Raman spectroscopy and electron diffraction from selected particles together with first principle density-functional calculations, indicate a cubic solid with dodecahedral C20 cages as building blocks. Unlike solid C 60 and fully protonated C20, which are bound by van der Waals forces, the proposed structure is stabilized by linking of the C 20 dodecahedra, with bridging carbon atoms at interstitial tetrahedral sites to form a face-centered-cubic lattice with 22 carbon atoms per unit cell. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.