1. Key Laboratory for Micro-Nano
Physics and Technology of Hunan Province, State Key Laboratory of
Chemo/Biosensing and Chemometrics, College of Physics and Microelectronics
Science, Hunan University, Changsha 410082,
China
2. Department of Chemistry
and
Biochemistry and California NanoSystems Institute, University of California at Los Angeles, Los Angeles, California
90095, United States