1. Center for Individual
Nanoparticle Functionality, Department of Physics, Technical University of Denmark, Building 311, Fysikvej, DK-2800 Kgs, Lyngby, Denmark
2. Department
of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United States
3. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-4034, United States