Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Fachverband Atomphysik
A 16: Atomic Clusters
A 16.2: Vortrag
Donnerstag, 13. März 2008, 08:45–09:00, 3D
Optical properties and electronic structure of ideal nanodiamonds — Lasse Landt1, Kathrin Klünder1, Jeremy Dahl2, Bob Carlson2, Thomas Möller1, and •Christoph Bostedt1 — 1IOAP - Technische Universität Berlin — 2MolecularDiamonds Technologies
Diamondoids can be considered the smallest possible cage-like subunits that can be excised from diamond lattice closing the gap between large hydrocarbon molecules and nanodiamonds. The optical and electronic properties of perfectly size- and structure-selected, neutral, and surface-passivated diamondoids ranging in size from 0.5 to 1 nm have been determined by means of PES, XAS, and optical absorption measurements. All data were taken from high purity samples in the gas phase revealing optical gap and band edges with near theoretical purity. We find that the optical properties of the perfectly size- and shape-selected nanocrystals exhibit strong shape dependence unlike band edges or ionization potentials which have also been determined. The observed isomeric dependencies of the optical gap will be discussed and first experimental data on the influence of targeted surface modification (e.g. thiols, alcohols) will be presented.