1. Department of Chemistry The University of North Carolina at Charlotte Charlotte NC 28223 USA
2. Nanoscale Science Program The University of North Carolina at Charlotte Charlotte NC 28223 USA
3. Department of Biological Sciences The University of North Carolina at Charlotte Charlotte NC 28223 USA
4. Analytical Research Laboratory North Carolina A&T State University Greensboro NC 27411 USA
5. Center for Biomedical Engineering and Science The University of North Carolina at Charlotte Charlotte NC 28223 USA