1. Department of Chemistry and Biochemistry; North Dakota State University; 1231 Albrecht Blvd Fargo ND 58108 USA
2. Materials and Nanotechnology Program; North Dakota State University, 51 Batcheller Technology Center; Fargo ND 58105 USA
3. Department of Physics; North Dakota State University; 1211 Albrecht Blvd Fargo ND 58108 USA