1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, USA
2. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, California 90095-1597, USA
3. Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095-1595, USA
4. Department of Chemistry and Biochemistry, The University of Toledo, Toledo, Ohio 43606, USA
5. California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095-8352, USA
6. Institute of the Environment and Sustainability, University of California, Los Angeles, Los Angeles, California 90095-1496, USA