J Phys Chem B 2014 Feb 19;118(8):2112-23. Epub 2014 Feb 19.
Departments of Biomedical Engineering, ‡Chemistry, and §Physics, ∥the Program in Applied Physics, and ⊥the Michigan Nanotechnology Institute for Medicine and Biological Sciences, University of Michigan , Ann Arbor, Michigan 48109, United States.