1. Department of Chemical and Petroleum Engineering, University of Pittsburgh , Pittsburgh, PA , United States
2. Environmental TEM Catalysis Consortium (ECC), University of Pittsburgh , Pittsburgh, PA , United States
3. Center for Integrated Nanotechnologies , Sandia National Laboratories, Albuquerque, NM , United States
4. Department of Materials Science and Engineering, Carnegie Mellon University , Pittsburgh, PA , United States
5. Electronic Materials and Devices Department, Applied Research Lab, Pennsylvania State University , University Park, PA , United States
6. Department of Materials Science and Engineering, Pennsylvania State University , University Park, PA , United States
7. Department of Physics and Astronomy, University of Pittsburgh , Pittsburgh, PA , United States
8. Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, NY , United States