(658b) Exciton Antennae and Concentrators From Core-Shell and Corrugated Carbon Nanotube Filaments of Homogeneous Composition Conference: AIChE Annual MeetingYear: 2010Proceeding: 2010 AIChE Annual MeetingGroup: Materials Engineering and Sciences DivisionSession: Nanostructured Materials for Electronic and Photonic Applications Time: Thursday, November 11, 2010 - 12:55pm-1:20pm Authors: Han, J., Massachusetts Institute of Technology Paulus, G. L., Massachusetts Institute of Technology Maruyama, R., Sony Corporation Heller, D. A., Massachusetts Institute of Technology Kim, W., Massachusetts Institute of Technology Barone, P. W., Massachusetts Institute of Technology Lee, C. Y., Ulsan National Institute of Science and Technology (UNIST) Choi, J. H., MIT Ham, M., Massachusetts Institute of Technology Song, C., Massachusetts Institute of Technology Fantini, C., Universidade Federal de Minas Gerais Strano, M. S., Massachusetts Institute of Technology There has been renewed interest in solar concentrators and optical antennae for improvements in photovoltaic energy harvesting and new opto-electronic devices. In this work, we dielectrophoretically assemble single-walled carbon nanotubes (SWNTs) of homogeneous composition into aligned filaments that can exchange excitation energy, concentrating it to the center of core-shell structures with radial gradients in the optical band gap. We find an unusually sharp, reversible decay in photoemission that occurs as such filaments are cycled from ambient to only 353 K, attributed to the strongly temperature dependent second order Auger process. Core-shell structures consisting of annular shells of mostly (6,5) SWNT (Eg = 1.20 eV ) and cores with bandgaps smaller than those of the shell (Eg = 1.02 eV (11,3) to 0.98 eV (8,7)) demonstrate the concentration concept: broad band absorption in the ultraviolet (UV) - near-infrared (nIR) wavelength regime provides singular photoemission at the (8,7) SWNT. This approach demonstrates the potential of specifically designed collections of nanotubes to manipulate and concentrate excitons in unique ways.