1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P.R. China
2. College of Physics, Jilin University, Changchun, Jilin 130012, P.R. China
3. Institute of Biophysics, Hebei University of Technology, Tianjin 300401, China
4. Department of Chemistry and Physics, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, United States