1. School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER...