1. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
6. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States