1. Department of Chemical Engineering and Material Science, University of Southern California, Los Angeles, California 90089
2. Molecular Foundry, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720
3. Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089
4. Department of Chemistry and Center for Electron Microscopy and Microanalysis, University of Southern California, Los Angeles, California 90089