6 science drive 2
Speaker: Martin Kalbac
Affiliation: J. Heyrovsky Institute of Physical Chemistry, Dolejškova, Prague, Czech Republic
Host: Prof. Antonio H. Castro Neto
Location: Click HERE for directions
Abstract Details: Control of the electronic structure of carbon nanostructures is an important issue for their application in new nanoelectronic devices, sensors or in energy storage. The electronic structure of nanocarbons can be changed by chemical doping, electrostatic or electrochemical charging (gating). Electrochemical charging, mimics a double layer capacitor, where the charge carriers are injected into the system from the electrode and the electrolyte ions only compensate the injected charge. In–situ Raman spectroelectrochemistry is a well-established method for investigating the change in physical properties of carbon nanostructures during charging. Here, I will present the possibilities and challenges of this methodology in the study of nanoscale systems.
Functional groups on graphene can be used to actively tune the graphene interface properties. However, in order to preserve interesting properties of graphene one needs to use high quality single layer graphene as a starting material. Here I will show possible strategies to functionalize chemical vapor deposition grown graphene and also demonstrate application of the grafted chemical moieties. The role of the substrate, number of graphene layers and graphene pre-treatment will be revealed. I will also discuss appropriate methods to characterize functionalized large area graphene including direct identification of functional groups attached to graphene. Finally, I will show example of the targeted application of functional groups to optimize the interface between the polymer and the graphene and to enable directed mechanical motion of diamond nanoparticles on the graphene surface.
About the Speaker: Martin Kalbac graduated in inorganic chemistry from Charles University, Prague, Czech Republic, (1998), where he also received his Ph.D. degree in 2002. Since 2001 he has worked at the J. Heyrovsky Institute of Physical Chemistry of the Academy of Sciences of the Czech Republic. Currently, he is a vice-director of the institute and the head of the Department of Low dimensional Systems. His research interests include carbon nanotubes, graphene, Raman spectroscopy and spectroelectrochemistry, isotope engineering of carbon nanostructures, sensors and rational functionalization of surfaces and 2-D materials.