| Original Articles |
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Low-Dimensional Forest-Like and Desert-Like Fractal Patterns Formed in a DDAN Molecular System |
| CAI Jin-Ming1;BAO Li-Hong1;GUO Wei1;CAI Li1;HUAN Qing1;LIAN Ji-Chun1;GUO Hai-Ming1;WANG Ke-Zhi2;SHI Dong-Xia1;PANG Shi-Jin1;GAO Hong-Jun1 |
| 1Beijing National Laboratory of Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 1000802Department of Chemistry, Beijing Normal University, Beijing 100871 |
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| Cite this article: |
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CAI Jin-Ming, BAO Li-Hong, GUO Wei et al 2007 Chin. Phys. Lett. 24 2918-2921 |
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Abstract Two kinds of forest-like and desert-like patterns are formed by thermal
evaporation of 4-dicyanovinyl-N, N-dimethylamino-1-naphthalene (DDAN)
onto SiO2 substrates. Based on thermal kinetics of the molecules on the substrate the transformation between the forest and desert patterns is due to two factors. The first one is the diffusion length, which is related to the deposition rate, the diffusion potential energy barrier and the substrate temperature. The second one is the strong interaction between the two polarity chemical groups of the molecules, which is beneficial to the formation of branches. Totally different patterns are also found on mica substrates, and are attributed to the anisotropic diffusion and the stronger interaction between DDAN molecules and the mica surface.
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68.55.Ac
68.65.-k
64.60.Ak
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Received: 29 January 2007
Published: 20 September 2007
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| PACS: |
68.55.Ac
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68.65.-k
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(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
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64.60.Ak
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