Synthesis and Photophysics of Quaterrylene Molecules in Single-Walled Carbon Nanotubes: Excitation Energy Transfer between a Nanoscale Cylinder and Encapsulated Molecules

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• 作者：Takeshi Koyama ; Takuya Tsunekawa ; Takeshi Saito ; Koji Asaka ; Yahachi Saito ; Hideo Kishida ; Arao Nakamura
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：118
• 期：37
• 页码：21671-21681
• 全文大小：545K
• ISSN：1932-7455

文摘

We report the synthesis of quaterrylene monomers and dimers from perylene inside single-walled carbon nanotubes (SWNTs). Excitation energy transfer (EET) from the encapsulated molecule to the SWNT is investigated by using femtosecond pump鈥損robe spectroscopy and time-resolved luminescence spectroscopy. Optical spectroscopy and transmission electron microscopy reveal the molecular arrangement of quaterrylene monomers and dimers within the SWNTs. The observed EET time from the dipole-allowed excited state of the quaterrylene monomer to the SWNT depends on the tube diameter and is found to be 1.1 卤 0.2 ps and 0.4 卤 0.1 ps for average diameters of 1.4 and 1.8 nm, respectively. These transfer times are ascribed to EET via a Coulomb interaction between transition dipoles. The transfer time from the dipole-forbidden state of the dimer to the SWNT with an average diameter of 1.8 nm is 3.8 卤 0.2 ps. The EET mechanism presumably corresponds to electron exchange or Coulomb interactions involving higher multipoles.