1. Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
2. College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, China
3. Department of Materials Science and Engineering, University of California, Irvine, California 92697, United States
4. Department of Physics and Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education; Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
5. Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
6. Department of Physics and Astronomy, University of California, Irvine, California 92697, United States