1. NanoMaterials Group, Department of Applied Physics and Center for New Materials, Aalto University, Puumiehenkuja 2, 00076 AALTO, Finland
2. Canatu Ltd., 02150, Espoo, Finland
3. Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 Helsinki, Finland
4. Department of Mathematics and Systems Analysis, Aalto University, Espoo, Finland