Fullerene-functionalized carbon nanotubes as improved optical limiting devices
Mackiewicz, Nicolas | Bark, Thomas | Cao, Bertrand | Delaire, Jacques A. | Riehl, Didier | Ling, Wai Li | Foillard, Stéphanie | Doris, Eric
We report the synthesis, characterization and optical limiting behavior of a nanohybrid built by grafting C₆₀-fullerenes on carbon nanotubes (CNTs). The nonlinear optical limiting properties of the CNT-C₆₀ complex were investigated at wavelengths where C₆₀ does not absorb. We found that the nanohybrid had superior performances to those of CNTs and fullerenes, either taken individually or as a mixture. This enhanced optical limitation of the nanohybrid suggests not only cooperative but also synergistic effects between the two carbon forms. A mechanism involving higher excitonic states of the CNTs formed by Auger recombination of low energy excitons is proposed.
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