1. Nanoscale Science Program Department of Chemistry The University of North Carolina at Charlotte Charlotte NC 28223 USA
2. Department of Physics and Optical Science The University of North Carolina at Charlotte Charlotte NC 28223 USA
3. Department of Pharmacology Department of Biochemistry & Molecular Biology Penn State College of Medicine Hershey PA 17033 USA
4. Nanotechnology Characterization Lab Frederick National Laboratory for Cancer Research sponsored by the National Cancer Institute Frederick MD 21702 USA