National ESCA and Surface Analysis Center for Biomedical Problems (NESAC/BIO), Departments of Bioengineering and Chemical Engineering, University of Washington, Seattle, Washington 98195, Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany, and Institut für Chemie and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Universität Kassel, 34109 Kassel, Germany (At 2010-08-12)