1. Department of Chemistry and Biochemistry, The University of Texas at El Paso, El Paso, Texas 79968, United States
2. Department of Chemistry, University of Puerto Rico at Río Piedras, San Juan, Puerto Rico 00926, United States
3. Department of Mechanical Engineering, Alabama A&M University, Huntsville, Alabama 35762, United States
4. Department of Electrical Engineering and Computer Science, Alabama A&M University, Huntsville, Alabama 35762, United States