1. Department of Materials Science and Nanoengineering; Rice University; Houston TX 77005 USA
2. Department of Chemistry; Rice University; Houston TX 77005 USA
3. Applied Physics Department; State University of Campinas - UNICAMP, UNICAMP-IFGW-DFA; 13083-859 Campinas SP Brazil
4. Materials Science and Technology Division; Oak Ridge National Lab; Oak Ridge TN 37831 USA
5. U.S. Army Research Laboratory; Vehicle Technology Directorate; Aberdeen Proving Ground MD 21005 USA