1. Faculty of Mathematics and Natural Sciences: Inorganic Chemistry, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
2. Chair for New Manufacturing Technologies and Materials, University of Wuppertal, Bahnhofstraße 15, 42651 Solingen, Germany
3. Faculty of Mathematics and Natural Sciences: Condensed Matter and Experimental Solid−State Physics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany