1. Institute of Materials Science, University of Connecticut, 97 N. Eagleville Rd., Storrs, Connecticut 06269-3136, United States
2. Department of Chemistry, University of Connecticut, 55 N. Eagleville Rd., Storrs, Connecticut 06269-3060, United States
3. Department of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907-2045, United States
4. Materials Science and Engineering Division, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States