1. Department of Chemistry and Biomolecular Science, and NanoBio Laboratory (NABLAB), Clarkson University, Potsdam, New York 13699-5810
2. Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Ginsterweg 1, D-52428 Jülich, Germany, and Institute of Bio- and Nanosystems (IBN2), Research Centre Jülich, D-52425 Jülich, Germany
3. Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049 Cantoblanco, Madrid, Spain