1. Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
2. Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
3. Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States
4. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
5. Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
6. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States