|Element 1:|| Carbon|
|Added to NIL:|| 8/17/2007 12:59:00 PM|
University of Illinois at Urbana-Champaign
Single walled carbon nanotubes and their more economical counterparts, carbon nanofibers, are promising components of nanocomposite systems with significant improvements predicted for tensile strength, strength to weight ratio and processing ability compared to conventional materials. To synthesize such nanocomposites, the carbon nanotubes need to be dispersed well enough to avoid inter-bundle load transfer. They also need to be functionalzed to secure the nanotubes to the matrix. However this functionalization cannot introduce defects at a level that disrupts or compromises the integrity of the nanotubes. These efforts have been hampered by the practical constraint that current methods to measure matrix dispersion and the degree of functionalization are extremely time consuming or not accurately known at all. The problem addressed in this project is the development of reliable, reproducible and efficient spectroscopic methods for determining two important system properties: nanotube dispersion and aggregation state in the matrix, and degree of chemical functionalization on the nanotube sidewall.
M.S. Strano, M. Zheng, A. Jagota, G.B. Onoa, D.A. Heller, P.W. Barone, M.L. Usrey: Understanding the nature of the DNA-assisted separation of single-walled carbon nanotubes using fluorescence and Raman spectroscopy. Nano Letters 4 (2004) 543-50. S.K. Doorn, D.A. Heller, P.W. Barone, M.L. Usrey, M.S. Strano: Resonant Raman excitation profiles of individually dispersed single walled carbon nanotubes in solution. Applied Physics a-Materials Science & Processing 78 (2004) 1147-55. M.S. Strano: Probing chiral selective reactions using a revised Kataura plot for the interpretation of single-walled carbon nanotube spectroscopy. Journal of the American Chemical Society 125 (2003) 16148-53. M. Zheng, A. Jagota, M.S. Strano, A.P. Santos, P. Barone, S.G. Chou, B.A. Diner, M.S. Dresselhaus, R.S. McLean, G.B. Onoa, G.G. Samsonidze, E.D. Semke, M. Usrey, D.J. Walls: Structure-based carbon nanotube sorting by sequence-dependent DNA assembly. Science 302 (2003) 1545-48. S.T. Huxtable, D.G. Cahill, S. Shenogin, L.P. Xue, R. Ozisik, P. Barone, M. Usrey, M.S. Strano, G. Siddons, M. Shim, P. Keblinski: Interfacial heat flow in carbon nanotube suspensions. Nature Materials 2 (2003) 731-34. M.S. Strano, C.A. Dyke, M.L. Usrey, P.W. Barone, M.J. Allen, H.W. Shan, C. Kittrell, R.H. Hauge, J.M. Tour, R.E. Smalley: Electronic structure control of single-walled carbon nanotube functionalization. Science 301 (2003) 1519-22.