1. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA
2. Department of Physics, University of Florida, Gainesville, Florida 3261, USA
3. Department of Electronic Materials Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
4. Nanoscience Institute for Medical and Engineering Technology, University of Florida, Gainesville, Florida 32601, USA
5. Raith USA, Incorporated, Ronkonkoma, New York 11779, USA
6. Department of Chemical Engineering, University of Florida, Gainesville, Florida 3261, USA