Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.146: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Tuning the interaction between carbon nanotubes and dipole switches: influence of the change of the nanotube-spiropyran distance — •Pascal Bluemmel1, Antonio Setaro1, Chandan Maity2, Stefan Hecht2, and Stephanie Reich1 — 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin
The non-covalent functionalization of carbon nanotubes with spiropyran molecules, serving as optically addressable dipole switches, is reported. Two types of pyrene-spiropyran based dyads with spacers of different lengths resulting in different switch-tube distances were investigated. While both surfactants were able to form stable carbon nanotube suspensions, the different distances between the switch and the tube affect both of the components’ optical properties. In the case of the shorter spacer, the nanotubes’ luminescence as well as the merocyanine absorption band were red-shifted and furthermore, the rate of the merocyanine to spiropyran thermal back isomerization was decreased.