1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
2. Department of Civil and Environmental Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
3. Water Planet, Inc., Los Angeles, California 90301, United States
4. Department of Materials Science and Engineering
and the California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States