1. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
2. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States
3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. National Center
for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Center for NanoMedicine, Institute for Basic Science (IBS), Seoul 03722, Korea
6. Y-IBS Institute, Yonsei University, Seoul 03722, Korea
7. Kavli Energy NanoScience Institute, Berkeley, California 94720, United States