1. Department of Chemistry, University at Buffalo, Buffalo, New York 14260-3000
2. Department of Physics, University at Buffalo, Buffalo, New York 14260
3. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
4. Department of Electrical Engineering, University at Buffalo, Buffalo, New York 14260
5. Department of Chemical and Biological Engineering, University at Buffalo, Buffalo, New York 14260