1. University of Arizona, Department of Chemistry & Biochemistry, 1306 East University Boulevard, Tucson, Arizona 85721, United States
2. Brookhaven National Laboratory, Center for Functional
Nanomaterials, Upton, New York 11973, United States
3. Department of Electrical & Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
4. University of Arizona, Department of Physics, 1118 East Fourth Street, Tucson, Arizona 85721, United States