Перенос резонансної енергії від барвника до вуглецевої нанотрубки

• Datum: 2025
• Hauptverfasser: Семчук, O. Ю., Білюк, A. A., Гаврилюк, O. O.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2025
• Schlagworte: графен; поверхневі плазмони; плазмонний; вуглець; передача енергії; теорія Форстера; екситон; FRET; нанотрубка
• Online Zugang: https://surfacezbir.com.ua/index.php/surface/article/view/804
• Назва журналу: Surface

In this work, we have studied the process of energy transfer from a fluorophore to the electronic energy levels of a single-walled carbon nanotube. Recently, carbon nanotubes have attracted considerable attention due to a number of potential technological applications, such as optoelectronic devices, sensors, etc. Functionalization of nanotubes with fluorophores has led to interesting photophysical properties. Excitation energy transfer is an important photophysical process that experimentally shown to occur when dyes are functionalized on nanotubes. Motivated by these experiments, we have studied theoretically the process of resonance energy transfer from a fluorophore to a single-walled carbon nanotube. We used the dipole approximation for the dye, not the nanotube, when transferring energy from the dye to the nanotube. Resonance energy transfer is the process of non-radiative energy transfer from an excited donor to an acceptor. When the transfer involves electronic excitation energy and the donor is fluorescent, this is known as fluorescence resonance energy transfer (FRET). In FRET, the interaction between the donor and acceptor is Coulomb. The electron transition dipoles of the donor and acceptor interact electrostatically, resulting in a dependence of the transfer rate on the distance between the donor and acceptor. Förster investigated this process theoretically. In Förster's approach, this is approximated as the interaction between the corresponding transition dipoles. Metallic carbon nanotubes have an exponential dependence on distance when ћΩ < εg and d-5 otherwise. There is no threshold on the amount of energy that can be transferred to metallic nanotubes. In contrast, for semiconductor nanotubes, energy transfer does not occur if ћΩ ≥ εg – εb. If ћΩ ≥ εb, then the rate has a dependence d-5 in the long-range limit. But if εg > ћΩ ≥ εg – εb, then the rate has an exponential dependence on distance. We also incorporate the possibility of energy transfer to excitons of semiconductor tubes into our analysis. Our calculations show that the energy transfer rate from pyrene to nanotube 5.5 is effective up to distances of the order of 16.5 nm.