1. Institute of Applied and Physical Chemistry University of Bremen Leobener Str. 6 28359 Bremen Germany
2. Institute of Solid-State Physics University of Bremen Otto-Hahn-Allee 1 28359 Bremen Germany
3. Institute for Microsensors, -actuators and -systems (IMSAS) University of Bremen Otto-Hahn-Allee 1 28359 Bremen Germany
4. Südzucker AG Central Department Research, Development, and Services (CRDS) Wormser Strasse 11 67283 Obrigheim Germany