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Optical Spectroscopy of Single-Walled Carbon Nanotubes

Collaborators. Overall Program and Optical CharacterizationLouis Brus: Gordana Dukovic, Matt Sfeir (CU Chemistry)Oxygen Photochemistry (for sidewall oxidation)Nick Turro: Brian White, Steffen Jockush (CU Chemistry)Electronic Structure Calculations (for sidewall oxidation)Rich Friesner, Mike Steigerwald: Zhiyong Zhou (CU Chemistry)Silicon Fabrication (for single nanotube Rayleigh scattering)Jim Hone: Chia-Chin Chuang (CU Mechanical Eng.)Nanotube CVD Growth (for single nanotube 1141

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Optical Spectroscopy of Single-Walled Carbon Nanotubes

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    1. Optical Spectroscopy of Single-Walled Carbon Nanotubes

    3. References to Published Papers F. Wang, G. Dukovic, L. E. Brus, and T. F. Heinz, “Time-Resolved Fluorescence in Carbon Nanotubes and Its Implication for Radiative Lifetimes,” Phys. Rev. Lett. 92, 177401 (2004). F. Wang, G. Dukovic, E. Knoesel, L.E. Brus, T.F. Heinz, "Observation of rapid Auger recombination in optically excited semiconducting carbon nanotubes," Phys. Rev. B 70, 241403 (2004) M.Y. Sfeir ,F. Wang ,L.M. Huang ,C.C. Chuang ,J. Hone ,S.P. O'Brien ,T.F. Heinz ,L.E. Brus, "Probing electronic transitions in individual carbon nanotubes by Rayleigh scattering," Science 306 1540-1543 (2004) G. Dukovic, B. E. White, Z. Zhou, F. Wang, S. Jockusch, M.L. Steigerwald, T.F. Heinz, R.A. Friesner, N.J. Turro, L.E. Brus, " Reversible Surface Oxidation and Efficient Luminescence Quenching in Semiconductor Single-Wall Carbon Nanotubes," JACS 126 15269-15276 (2004)

    4. Carbon Nanotubes SWNT

    5. Carbon Nanotubes: Rolled-up Graphene Sheet

    6. Electronic Structure

    7. Electrical Transport Properties of SWNTs Distinctive metallic and semiconducting transport properties Ballistic transport, Extremely high current carrying capacity

    8. Optical Properties Signature of excited states Route to explore carrier dynamics Potential for optoelectronic applications as emitters, detectors, NLO elements with tunable response based on SWNT structure

    9. Light Emission from SWNT

    11. Fluorescence Spectra

    12. Some Outstanding Issues What controls the quantum efficiency What are the non-radiative relaxation channesl How are the rates and pathways of energy relaxation to the band edge What is the nature of the excited states (free carriers or excitons)

    13. Time-Resolved Fluorescence by Optical Kerr Gating

    14. Time-Resolved Fluorescence

    15. Radiative Recombination Lifetime

    16. Radiative Recombination Lifetime: Theoretical Prediction

    17. Implication of the Radiative Lifetime

    18. New Channel with Multiple e-h Pairs

    19. Multi-Carrier Interaction: Auger Process (Exciton-Exciton Annihilation)

    21. Modeling vs. Experiment

    22. Summary: Carrier Dynamics in SWNT

    24. pH dependence of SWNT luminescence

    25. SWNT Oxide: Experimental Observations

    26. Direct observation of oxygen desorption

    27. SWNT Oxide Structure

    28. Hole-Induced Fluorescence Quenching

    29. Summary: Sidewall Oxide – Optical Properties

    30. Challenge: Studying Individual Nanotubes

    31. Optical Spectroscopy of Single Nanotubes

    32. I: Supercontinuum Radiation

    33. Microstructured Optical Fiber

    34. II: Suspended Carbon Nanotubes

    35. CVD Growth of SWNTs across Slit Sample

    36. Two Types of Rayleigh Spectra from Individual Nanotubes

    37. Rayleigh Scattering from Nanotubes

    38. Rayleigh Scattering from Nanotubes

    39. Understanding the Scattering Spectra

    40. Rayleigh Scattering from Nanotubes

    41. Understanding the Scattering Spectra

    42. Polarization Dependence of The Rayleigh Scattering

    43. Polarization Perpendicular to the SWNT: Depolarization Effect

    44. Scattering Spectra along the Nanotube: Single Tube

    45. Scattering Spectra along the Nanotube: Single Tube to Bundle of Two SWNTs

    46. Correlated Raman and Rayleigh Scatterings from the Same Nanotube

    47. Summary: Rayleigh Scattering

    48. Overall Summary

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