1. Department of Chemistry, Ruhr-University Bochum, 44801 Bochum, Germany
2. Biomedical Nanosensors, Fraunhofer Institute for Microelectronic Circuits and Systems, 47057 Duisburg, Germany
3. Nanoparticle Systems Engineering Laboratory, ETH Zürich, 8092 Zürich, Switzerland
4. Laboratory for Particles−Biology Interactions, Empa, 9014 St. Gallen, Switzerland
5. Center for Nanointegration Duisburg-Essen (CENIDE), 47057 Duisburg, Germany