Memory effect in the deposition of C20 fullerenes on a diamond surface
Du, A.J., Pan, Z.Y., Ho, Y.K., Huang, Z., & Zhang, Z.X. (2002) Memory effect in the deposition of C20 fullerenes on a diamond surface. Physical Review B, 66(3), 035405-1 .
In this paper, the deposition of C-20 fullerenes on a diamond (001)-(2x1) surface and the fabrication of C-20 thin film at 100 K were investigated by a molecular dynamics (MD) simulation using the many-body Brenner bond order potential. First, we found that the collision dynamic of a single C-20 fullerene on a diamond surface was strongly dependent on its impact energy. Within the energy range 10-45 eV, the C-20 fullerene chemisorbed on the surface retained its free cage structure. This is consistent with the experimental observation, where it was called the memory effect in "C-20-type" films [P. Melion , Int. J. Mod. B 9, 339 (1995); P. Milani , Cluster Beam Synthesis of Nanostructured Materials (Springer, Berlin, 1999)]. Next, more than one hundred C-20 (10-25 eV) were deposited one after the other onto the surface. The initial growth stage of C-20 thin film was observed to be in the three-dimensional island mode. The randomly deposited C-20 fullerenes stacked on diamond surface and acted as building blocks forming a polymerlike structure. The assembled film was also highly porous due to cluster-cluster interaction. The bond angle distribution and the neighbor-atom-number distribution of the film presented a well-defined local order, which is of sp(3) hybridization character, the same as that of a free C-20 cage. These simulation results are again in good agreement with the experimental observation. Finally, the deposited C-20 film showed high stability even when the temperature was raised up to 1500 K.
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|Item Type:||Journal Article|
|Keywords:||Physics, Condensed Matter Molecular-dynamics Simulations Smallest Fullerene (001)-(2x1) Surface Rotational Energy Carbon-films Clusters Buckminsterfullerene Chemisorption Distributions Adsorption|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||09 Jul 2013 03:58|
|Last Modified:||09 Jul 2013 04:36|
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