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- Title
Controlling on-surface polymerization by hierarchical and substrate-directed growth.
- Authors
Lafferentz, L.; Eberhardt, V.; Dri, C.; Africh, C.; Comelli, G.; Esch, F.; Hecht, S.; Grill, L.
- Abstract
A key challenge in the field of nanotechnology, in particular in the design of molecular machines, novel materials or molecular electronics, is the bottom-up construction of covalently bound molecular architectures in a well-defined arrangement. To date, only rather simple structures have been obtained because of the limitation of one-step connection processes. Indeed, for the formation of sophisticated structures, step-by-step connection of molecules is required. Here, we present a strategy for the covalent connection of molecules in a hierarchical manner by the selective and sequential activation of specific sites, thereby generating species with a programmed reactivity. This approach leads to improved network quality and enables the fabrication of heterogeneous architectures with high selectivity. Furthermore, substrate-directed growth and a preferred orientation of the molecular nanostructures are achieved on an anisotropic surface. The demonstrated control over reactivity and diffusion during covalent bond formation constitutes a promising route towards the creation of sophisticated multi-component molecular nanostructures.
- Subjects
POLYMERIZATION; NANOTECHNOLOGY; MOLECULAR electronics; HALOGEN compounds; COVALENT bonds; POLYMERASE chain reaction; SCANNING tunneling microscopy; PORPHYRIN synthesis
- Publication
Nature Chemistry, 2012, Vol 4, Issue 3, p215
- ISSN
1755-4330
- Publication type
Article
- DOI
10.1038/nchem.1242