STM observations of self-assembled 1D and 2D nanoclusters of aromatic cryptand molecules deposited on highly oriented pyrolytic graphite
1997; Elsevier BV; Volume: 4; Issue: 3-4 Linguagem: Inglês
10.1016/s0968-5677(97)00019-9
ISSN1873-4146
AutoresLaurent Markey, D. Stiévenard, A. Devos, M. Lannoo, Franck Demol, Marc De Backer,
Tópico(s)Carbon Nanotubes in Composites
ResumoAromatic cryptands can be considered as 'pseudo fullerene molecules', containing three separated π systems. The studied molecule [iso hexa imino cryptand (IHIC)] is made of 36 atoms of carbon, eight of nitrogen and 42 of hydrogen. Synthesis of the molecules gives a powder. Once the powder dissolved in chloroform, it is easy to deposit it on highly oriented pyrolytic graphite (HOPG) just by dipping the HOPG in the solution. After evaporation of the solvent, one-dimensional (1D) and two-dimensional (2D) structures are observed by using the scanning tunnelling microscopy technique. The 1D structures (chains) are made of nanoclusters containing typically six or sveen molecules. The distances between each molecule in a nanocluster are compared with those calculated on the basis of van der Waals' and electrostatic interactions. The theoretical approach predicts the formation of nanoclusters, in agreement with the experimental observations. Finally, the observation of an hexagonal network is compared and discussed in terms of the Moiré effect.
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