1. Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
2. Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
3. Center for Bio-Inspired Energy Science, Northwestern University, Evanston, Illinois 60208, United States
4. DuPont-Northwestern-Dow Collaborative Access Team Synchrotron Research Center, Northwestern University, Advanced Photon Source/Argonne National Laboratory 432-A004, Argonne, Illinois 60439, United States
5. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
6. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States