1. Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
2. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
3. Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, United States
4. Department of Pharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, United States
5. California NanoSystems Institute (CNSI), University of California, Los Angeles, 570 Westwood Plaza, Los Angeles, California 90095, United States