1. Empire State College, SUNY, P.O. Box 908, Fort Drum, New York 13602-0908, United States
2. Department of Chemistry and Biomolecular Science, and NanoBio Laboratory (NABLAB), Clarkson University, Potsdam New York 13699-5810, United States
3. Department of NanoEngineering, University of California—San Diego (UCSD), La Jolla, California 92093, United States