1. Department of Materials; Institute of Polymer Chemistry; ETH Zurich; Vladimir-Prelog-Weg 5 8093 Zurich Switzerland
2. Department of Chemistry and Applied Biosciences; ETH Zurich; Vladimir-Prelog-Weg 5 8093 Zurich Switzerland
3. Laboratory for Micro- and Nanotechnology; Paul Scherrer Institute; 5232 Villigen Switzerland
4. School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
5. Material Physics Center CSIC-UPV/EHU and Donostia International Physics Center DIPC; Donostia-San Sebstian 20018 Spain
6. Department of Chemistry; University of Nevada; Reno NV 89557-0216 USA