1. Department of Physics & Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, United States
2. Center of Nanosciences & Nanotechnologies, CNRS UMR 9001, University of Paris-Saclay, Paris 91120, France
3. Materials Characterization Lab, Pennsylvania State University, N-317 Millennium Science Complex, Pollock Road, University Park, Pennsylvania 16802, United States
4. Department of Chemistry and Physics, University of Arkansas at Pine Bluff, 1200 N. University Drive, Pine Bluff, Arkansas 71601, United States