1. Department of Materials Science and Engineering, School of Chemical Technology, Aalto University, POB 16200, 00076 Espoo, Finland
2. NanoMaterials Group, Department of Applied Physics, School of Science, Aalto University, POB 15100, 00076 Espoo, Finland
3. Department of Forest Products Technology, School of Chemical Technology, Aalto University, POB 16400, 00076 Espoo, Finland