1. Department of Chemistry and Biochemistry, California State University Northridge, Northridge, California 91330, United States
2. Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
3. Savannah River National Laboratory, Aiken, South Carolina 29803, United States
4. Department of Applied Physics and Institution of Energy and Microstructure, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, P. R. China
5. Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
6. Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China