1. NanoMaterials Group, Department of Applied Physics and Center for New Materials, Aalto University, P.O. Box 15100, 00076 Espoo, Finland, Canatu Oy, Tekniikantie 21, FI-02150 Espoo, Finland, Solarno, Inc., 153 Hollywood Drive, Coppell, Texas 75019, NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75083, and VTT Biotechnology, Biologinkuja 7, 02044 Espoo, Finland