1. Department
of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, United States
2. Nebraska
Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, United States
3. Department
of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, United States
4. School
of Science and Engineering of Materials, Hefei University of Technology, Hefei, Anhui 230009, China
5. UR, Groupe de Physique des Matériaux−GPM, UMR CNRS 6634, 76801 Saint Etienne du Rouvray, France
6. Center for
Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
7. Department
of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588, United States
8. Division
of Materials Science and Engineering, Ames Lab, Ames, Iowa 50011-3020, United States