1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
2. California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
3. Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
4. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
5. Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
6. Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
7. Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States
8. Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, and Hatos Center for Neuropharmacology, University of California, Los Angeles, Los Angeles, California 90095, United States