Ultrafast electronic dynamics and vibrational dynamics of SWCNT under alkylation and annealing

Fu You Lu, Zhe Sheng He, Nian Zu She, Atsushi Yabushita*, Daiki Uchida, Yutaka Maeda, Takayoshi Kobayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Using ultrashort visible pulse laser, we have performed transient absorption spectroscopy to study the electronic relaxation and vibrational dynamics for three SWCNT samples of non-substituted SWCNT, alkylated SWCNT, and annealed alkylated SWCNT. Estimated lifetimes of ∼100 fs and ∼1 ps can be assigned to intraband and interband relaxation processes, respectively. Compared with the non-substituted sample, the intraband transition rate was found to be 7% smaller for the alkylated sample and nearly equal to the annealed alkylated sample within 2%. It implies that the intraband relaxation rate is not affected by alkylation itself but inhibited by excess chemical modification. Conversely, the interband relaxation rate shows no difference between the three samples. Short-time Fourier transform analysis of the measured traces of pump–probe delay dependent difference absorbance visualizes the change of molecular vibration frequency reflecting the energy transfer from (6,5)-SWCNT to (6,4)-SWCNT and the molecular structure change during the interband transition.

Original languageEnglish
Article number111387
JournalChemical Physics
Volume553
DOIs
StatePublished - 15 Jan 2022

Keywords

  • Electronic relaxation
  • SWCNT
  • Transient absorption spectroscopy
  • Ultrashort pulse laser
  • Vibrational dynamics

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