1. Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland
2. Department of Applied Physics, School of Science, Aalto University, 02150 Espoo, Finland
3. OtaNano-Nanomicroscopy Center, Aalto University, 02150 Espoo, Finland
4. Umicore Finland Oy, 67101 Kokkola, Finland