Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Focus: Molecularly Functionalized Low-Dimensional Systems I - organized by Antonio Setaro, Carola Meyer, Aravind Vijayaraghvan and Matteo Mannini
CPP 1.5: Vortrag
Montag, 12. März 2018, 10:45–11:00, C 130
[Selective covalent functionalization of carbon nanotubes activated by light — •Georgy Gordeev1, Thomas Rosenkranz2, Stephanie Reich1, and Ralph Krupke2,3 — 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Institute of Materials Science, Technische Universitat Darmstadt, Darmstadt, Germany — 3Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany
The diazonium reaction on nanotubes has recently attracted attention due to the ability of forming bright, fluorescent quantum defect states. The resonant light has been reported to accelerate and tune the reaction velocity. The latter is proportional to the energetic difference between transition energy and incident light. In our study, we demonstrate how a single chirality can be preferably functionalized by tuning optical excitation. We have performed the functionalization on a mixed chirality sample, resonantly exciting (9,7) tube. We monitored the reaction in situ via Raman spectroscopy. A dramatic difference between dark and illuminated areas in the functionalization degree was observed. The material outside the active spot did not demonstrate any changes from the pristine sample. The successful functionalization of the illuminated material was confirmed by resonant Raman scattering. The shift of transition energies and the number of sp3 defects was significantly higher in the resonantly excited nanotubes. The optically induced selectivity of the diazonium reaction paves a way of tuning and improving photonic devices based on nanotubes and can allow a large-scale single chirality enrichment of nanotubes.