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Optical properties of carbon nanotubes in a composite material: The role of dielectric screening and thermal expansion

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8 Author(s)
Berger, S. ; Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS UMR 8551, Université Pierre et Marie Curie, Université Paris Diderot, 24 rue Lhomond, Paris, France ; Iglesias, F. ; Bonnet, P. ; Voisin, C.
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We report on environmental effects on the optical properties of single-wall carbon nanotubes in a gelatin-based composite material designed to foster their photoluminescence. We show that the dielectric screening of excitons due to the surrounding medium is responsible for a sizeable shift of the luminescence lines, which hardly depends on the tube geometry. In contrast, the temperature dependence (from 4 to 300 K) of the luminescence is clearly chirality dependent; the first and second excitonic lines shift in opposite directions with a magnitude that can be related quantitatively to a strain-induced modification of the electronic structure due to an expansivity mismatch between the nanotube and the matrix.

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Journal of Applied Physics  (Volume:105 ,  Issue: 9 )