1. Department of Mathematics and Computer Science, Western Kentucky University, Bowling Green, Kentucky 42101, USA
2. Applied Physics Institute, Western Kentucky University, Bowling Green, Kentucky 42101, USA
3. Department of Chemical and Biomolecular Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
4. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
5. Sustainable Energy Education Research Center, The University of Tennessee, Knoxville, Tennessee 37996, USA