1. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
2. Department of Electrical and Electronic Engineering, Independent University, Bangladesh (IUB), Dhaka, Bangladesh
3. Department of Physiology, University of Kentucky, Lexington, Kentucky 40536, United States
4. Center for Nanophase Materials Sciences, Oakridge National Lab, Oakridge, Tennessee 37831, United States