1. Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, California 92697, USA
2. Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697, USA
3. Department of Chemistry, University of California, Irvine, Irvine, California 92697, USA
4. Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, California 92697, USA
5. Department of Biomedical Engineering, University of California, Irvine, Irvine, California 92697, USA