1. Department of Materials Science and Engineering; Department of Electrical Engineering and Department of Chemical Engineering; Stanford University; Stanford CA 94305 USA
2. Department of Chemistry and Biochemistry; University of California; Los Angeles CA 90095 USA
3. i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou Jiangsu 215125 China
4. Graduate Institute of Electronics Engineering; National Taiwan University; Taipei 106 Taiwan Republic of China