| Affiliation: | 1. Molecular Nanofabrication Group, Faculty of Science and Technology and MESA+Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede (The Netherlands);2. Current address: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, No.29, Xueyuan Road, 100083, Beijing, P. R. China;3. MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE, Enschede (The Netherlands) |
