1. NanoScience Technology Center; University of Central Florida; Orlando FL 32826 USA
2. Department of Materials Science and Engineering; University of Central Florida; Orlando FL 32826 USA
3. Laboratory of Theoretical and Computational Chemistry; Institute of Theoretical Chemistry; Jilin University; Changchun 130023 P. R. China
4. Department of Chemistry; Rice University; 6100 Main Street Houston TX 77005 USA
5. Department of Mechanical and Aerospace Engineering; University of Central Florida; Orlando FL 32826 USA