1. Laboratory
for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
2. Centre
of New Technologies (CeNT), University of Warsaw, Żwirki
i Wigury 93, 02-089 Warsaw, Poland
3. Laboratory
for Mechanics of Materials and Nanostructures, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Feuerwerkerstrasse 39, 3602 Thun, Switzerland