1. NanoScience Technology Center University of Central Florida Orlando FL 32826 USA
2. Analytical Research Division Korea Basic Science Institute Jeonju 54907 South Korea
3. Department of Chemistry Seoul National University Seoul 08826 South Korea
4. Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32826 USA
5. Department of Materials Science and Engineering Seoul National University Seoul 08826 South Korea
6. Department of Materials Science and Engineering University of Central Florida Orlando FL 32826 USA
7. Department of Physics University of Central Florida Orlando FL 32826 USA