1. Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States
2. Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115, United States
3. Department of Physics, University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States
4. Electron Microscopy Facility, Northeastern University, Boston, Massachusetts 02115, United States
5. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States
6. Department of Chemistry & Chemical biology, Northeastern University, Boston, Massachusetts 02115, United States
7. Department of Bioengineering, Northeastern University, Boston, Massachusetts 02115, United States