1. Institute of Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, 4132 Muttenz, Switzerland
2. Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, 4132 Villigen, Switzerland
3. Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University of Basel, 4058 Basel, Switzerland
4. Department of Chemistry, University of Basel, 4056 Basel, Switzerland
5. Swiss Nanoscience Institute and Department of Physics, University of Basel, 4056 Basel, Switzerland