Thursday 05 Feb 2015: Atomic-scale insights into 1D and 2D nano-materials
Professor Ursel Bangert - Department of Physics and Energy, University of Limerick, Limerick, Ireland
HAR/170 [3D Visualisation Suite] 14:00-15:30
The advent of new generation aberration corrected (scanning) transmission electron microscopes has made it possible, by combining atomic resolution imaging and spectroscopy as well as DFT modelling, to uncover atomic-scale morphology, constellations of defects, lattice impurities and ad-atoms in nano-carbons (carbon nano-tubes and graphene) as well as their influence on the surrounding bandstructure. Knowledge of this is vital for application of these materials in electronic devices. I will present issues concerning electrical contacting of graphene (metal mediated graphene etching resulting in hole 'drilling and filling') and results of attempts to tailor electronic properties (lattice doping via ion implantation) of both, graphene and carbon nano-tubes. I will furthermore demonstrate collective charge carrier behaviour (plasmons) in both nano-structures as well as peculiarities and tailoring of such plasmons (enhancement) through introduction of impurity atoms. Finally, I will present first results of atomic-scale structure and composition investigations of other 2-D materials (e.g., BN and transition metal dichalcogenides).