tailieunhanh - Báo cáo hóa học: "Femtosecond Dynamics in Single Wall Carbon Nanotube/Poly(3-Hexylthiophene) Composites"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Femtosecond Dynamics in Single Wall Carbon Nanotube/Poly(3-Hexylthiophene) Composites | Nanoscale Res Lett 2008 3 278-283 DOI s11671-008-9149-x NANO EXPRESS Femtosecond Dynamics in Single Wall Carbon Nanotube Poly 3-Hexylthiophene Composites Emmanouil Lioudakis Andreas Othonos Ioannis Alexandrou Received 12 April 2008 Accepted 11 July 2008 Published online 29 July 2008 to the authors 2008 Abstract Femtosecond transient absorption measurements on single wall carbon nanotube poly 3-hexylthiophene composites are used to investigate the relaxation dynamics of this blended material. The influence of the addition of nanotubes in polymer matrix on the ultrashort relaxation dynamics is examined in detail. The introduction of nanotube polymer heterojunctions enhances the exciton dissociation and quenches the radiative recombination of composites. The relaxation dynamics of these composites are compared with the fullerene derivative-polymer composites with the same matrix. These results provide explanation to the observed photovoltaic performance of two types of composites. Keywords Ultrafast spectroscopy Single wall carbon nanotubes Exciton dissociation Introduction The last two decades the optical properties of single wall carbon nanotubes SWNTs have gained a great deal of interest 1-3 . The one-dimensional 1D nature of nanotubes offers unique properties to their excitonic spectrum with many revolutionary applications 4 5 . Many experimental techniques such as Raman scattering and electrical conductivity 6 have been employed for the investigation of optical and electronic properties of nanotubes with E. Lioudakis El A. Othonos Department of Physics Research Center of Ultrafast Science University of Cyprus . Box 20537 1678 Nicosia Cyprus e-mail mlioud@ I. Alexandrou Electrical Engineering and Electronics University of Liverpool Liverpool L69 3GJ Uk variable diameters and angle chilarities 7 8 . Relaxation dynamics and nonlinear properties in these nanostructures are key issues in understanding and developing their optoelectronic properties.

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