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Ultrafast lattice and electronic dynamics in single-walled carbon nanotubes

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Abstract

Understanding the photoinduced ultrafast structural transitions and electronic dynamics in single-walled carbon nanotubes (SWCNTs) is important for the development of SWCNT-based optoelectronic devices. In this study, we conducted femtosecond-resolved electron diffraction and electron energy-loss spectroscopy (EELS) measurements on SWCNTs using ultrafast transmission electron microscopy. The experimental results demonstrated that dominant time constants of the dynamic processes were ∼1.4 ps for electron-driven lattice expansion, ∼17.4 ps for thermal phonon-driven lattice expansion associated with electron–phonon coupling. The time-resolved EELS measurements clearly revealed a notable red shift of plasmon peaks by ∼100 meV upon femtosecond laser excitation. Different features of charge carrier excitation and relaxation were carefully discussed in correlation with the lattice dynamics and photoinduced absorption signals of SWCNTs. Our results provide a comprehensive understanding of the ultrafast dynamics in SWCNTs and powerful techniques to characterize the dynamics of low-dimensional structures.

Graphical abstract: Ultrafast lattice and electronic dynamics in single-walled carbon nanotubes

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Supplementary files

Article information


Submitted
05 Apr 2020
Accepted
21 May 2020
First published
22 May 2020

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

Ultrafast lattice and electronic dynamics in single-walled carbon nanotubes

D. Zheng, C. Zhu, Z. Li, Z. Li, J. Li, S. Sun, Y. Zhang, F. Wang, H. Tian, H. Yang and J. Li, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/D0NA00269K

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    [Original citation] - Published by The Royal Society of Chemistry.

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