Energy flow: Efficient excitation transfer from porphyrins to nanotubes occurs when the porphyrin molecules, which act as antenna, are flattened (π-stacked, see figure) on the nanotube wall. The photoluminescence of the nanotubes is enhanced when the excitation energy is tuned in resonance with the absorption band of the porphyrins.
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Magadur et al. (2008) studied this question.
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