1. Department of Mechanical Engineering, North Carolina A&T State University, 1601 E Market St, Greensboro, North Carolina27411, United States
2. Cornell Center for Materials Research, Cornell University, Clark Hall, 627, 142 Sciences Dr, Ithaca, New York14850, United States
3. National Institute for Laser, Plasma and Radiation Physics, Strada Atomiştilor 409, Bucharest, Magurele077125, Romania
4. Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, Greensboro, North Carolina27401, United States