About the Authors

Ho Young Lee

Affiliation Department of Chemistry, Stanford University, Stanford, California, United States of America

Chaitan Khosla

To whom correspondence should be addressed. E-mail: khosla@stanford.edu

Affiliations Department of Chemistry, Stanford University, Stanford, California, United States of America , Department of Chemical Engineering, Stanford University, Stanford, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

HYL and CK conceived and designed the experiments. HYL performed the experiments and analyzed the data. HYL and CK wrote the paper.