Nanoscience Seminar Series | Kurt Gothelf

Modular DNA-Programmed Assembly of Nanostructures
Tuesday, April 13, 2004 - 2:15pm
Nanaline Duke Bldg, Room 147

Kurt Gothelf
Center for Catalysis and Interdisciplinary Nanoscience Center (iNANO),
Department of Chemistry, Aarhus niversity, Langelandsgade 140, Denmark

The major obstacle for building nanodevices such as molecular electronic circuits is to develop suitable building materials that know how to assemble individual components into well-defined structures. Our approach is molecular engineering to make a new material that is encoded with the information needed for building up a macromolecular network. We have made custom designed molecular modules that contain DNA chains for recognition, a carbon backbone, and metal binding groups at their ends. These modules are chemically reactive and can link themselves up into a two-dimensional network or a molecular wire. The resulting structures consist of a network of linear and branched oligo(phenylene ethynylene)’s which are linked by conjugated and rigid manganese-salen complexes and these nanoscaffolds are potential conductors. We have also studied the adsorption and self-organisation of a related type of linear, bent and tripoidal modules on Au(111) by UHV-STM. It is the first demonstration of a bottom up process making nanomatrix from encoded "Lego-like" molecular building blocks and the macromolecular nanostructures are potential conductors for applications in molecular electronics.