Self-assembled monolayers (SAMs) on gold can be used to create a variety of chemically well defined, functionalized interfaces. They are potential surfaces for the construction of microcircuits consisting of nanosized components. In our group metallodendritic wedges, specifically designed for adsorption on gold, have been prepared by non-covalent synthesis. They have a well-defined, three-dimensional architecture and can be regarded as a "bottom up" approach to the fabrication of nanoscale devices. The tethering of single, isolated metallodendritic wedge adsorbates has been achieved by exchanging molecules from a simple decanethiol monolayer with molecules of adsorbate in solution. Atomic force microscopy images show single features of the expected nanometer dimensions, that do not change position upon scanning. Preliminary results indicate that the metallodendritic wedges adsorb at defect sites present in the decanethiol monolayer and that the process is concentration dependent. Studies are also being carried out on the possibility of post-modification of surface confined metallodendritic wedges, and on the control of their positioning within the monolayer structure.
Supramolecular Chemistry and Technology, MESA+ Research Institute, University of Twente
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