About the Authors

Bo Xing

Affiliation Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin, People's Republic of China

Xue-Bo Yin

xbyin@nankai.edu.cn

Affiliation Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BX XBY. Performed the experiments: BX XBY. Analyzed the data: BX XBY. Contributed reagents/materials/analysis tools: XBY. Wrote the paper: BX XBY.