1. Institute of Biotechnology, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany
2. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
3. Institute of Materials in Electrical Engineering 1, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
4. DWI—Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, D-52056 Aachen, Germany