1. Department of Chemistry University of Nebraska‐Lincoln Lincoln NE 68588 USA
2. Department of Physics University of Central Florida Orlando FL 32816 USA
3. Department of Physics and Astronomy University of Nebraska‐Lincoln Lincoln NE 68588 USA
4. Department of Electronics Ivan Franko National University of Lviv Lviv 79000 Ukraine
5. National University of Science and Technology “MISIS” Moscow 119991 Russia
6. Nebraska Center for Materials and Nanoscience University of Nebraska‐Lincoln Lincoln NE 68588 USA