1. Institute of Technology for Nanostructures, University of Duisburg-Essen, 47057Duisburg, Germany
2. Institute for Combustion and Gas Dynamics─Reactive Fluids, University of Duisburg-Essen, 47057Duisburg, Germany
3. CENIDE─Center for Nanointegration Duisburg-Essen, 47057Duisburg, Germany