1. Institute for Micromanufacturing, Chemistry Department, and Physics Department, Louisiana Tech University, Ruston, Louisiana 71272, United States, Physics Department, Grambling State University, Grambling, Louisiana 71245, United States, Department of Electrical Engineering, Purdue University, West Lafayette, Indiana 47906, United States, and Chemistry Department, North Carolina A&T State University, Greensboro, North Carolina 27411, United States