1. Department
of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Center
for Two-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Materials
Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. Center
for Atomically Thin Multifunctional Coatings (ATOMIC), The Pennsylvania State University, University Park, Pennsylvania 16802, United States
6. Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States