About the Authors

Keun-Young Kim

Affiliation Department of Physics and Astronomy, State University of New York Stony Brook, Stony Brook, New York, United States of America

Jin Wang

To whom correspondence should be addressed. E-mail: jin.wang.1@stonybrook.edu

Affiliations Department of Physics and Astronomy, State University of New York Stony Brook, Stony Brook, New York, United States of America , Department of Chemistry, State University of New York Stony Brook, Stony Brook, New York, United States of America , State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

JW conceived and designed the experiments. KYK performed the experiments. KYK and JW analyzed the data, contributed reagents/materials/analysis tools, and wrote the paper.