1. Department of Materials and The Henry Royce Institute, The University of Manchester, Manchester M19 3PL, United Kingdom
2. Institute of Materials, Interfaculty Bioengineering Institute, MXG 030 Lausanne, Switzerland
3. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
4. Aqdot Limited, Iconix Park, London Road, Pampisford, Cambridge CB22 3EG, United Kingdom
5. Department of Physics and Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60607, United States