1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Materials Science and Engineering, University of California-Berkeley, Berkeley, California 94720, United States
3. Department of Chemistry, University of California-Berkeley, Berkeley, California 94720, United States
4. NASA Ames Research Center, Moffett Field, California 94035, United States
5. Molecular Foundry Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States