1. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
2. California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA
3. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
4. Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA 90095, USA
5. International Center for Materials Nanoarchitectonics Satellite (MANA), National Institute for Materials Science (NIMS), Tsukuba, Japan
6. Centre for Nanoscience and Quantum Information, University of Bristol, Bristol, UK