Lu, Bin and Iimori, Takushi and Sakamoto, Kazuyuki and Nakatsuji, Kan and Rosei, Federico and Komori, Fumio (2008) Fullerene on nitrogen-adsorbed Cu(001) nanopatterned surfaces: From preferential nucleation to layer-by-layer growth. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (27). pp. 10187-10192.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp800351z
Nitrogen (N)-adsorbed Cu(001)-c(2 x 2) nanopatterned surfaces are used as templates to guide the growth of low-dimensional C-60 molecular nanostructures. At room temperature and during the initial stages of growth, C-60 molecules preferentially adsorb on the bare Cu regions on a partially N-covered grid surface. Subsequently, a two-dimensional molecular nanomesh is formed at low (similar to 0.28 monatomic layer) C-60 coverages. Further deposition leads to C-60 growth on the c(2 x 2)-N surface until the first molecular layer is completed. For a N-saturated surface with trench structures, the < 010 > steps of these structures serve as initial anchoring sites for C-60 growth. From there, the growth proceeds two-dimensionally until a single C-60 layer is achieved due to island coalescence. In contrast, no nucleation site was observed when the < 110 > steps were predominant on the surface. At least up to 6 monatomic layers, the growth proceeds layer-by-layer (i.e., the overlayer morphologies are directed by the underlying substrate pattern). Four rotational domains are observed for the quasi -hexagonally close-packed C-60 overlayer with a nearest-neighbor C-60-C-60 distance of 1.02 nm. It was found that the interaction between C-60 and the c(2 x 2)-N surface is fairly weak, likely dominated by van der Waals forces, whereas the C-60-CU interface is chemisorbed. Site-specific electronic effects between these two regions can be resolved by STM even for thick films.
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
|Deposited By:||Farnush Anwar|
|Deposited On:||09 Jan 2009 16:36|
|Last Modified:||23 Jan 2009 09:39|
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