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Issue 35, 2017
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Ultrafast structural dynamics of boron nitride nanotubes studied using transmitted electrons

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Abstract

We investigate the ultrafast structural dynamics of multi-walled boron nitride nanotubes (BNNTs) upon femtosecond optical excitation using ultrafast electron diffraction in a transmission electron microscope. Analysis of the time-resolved (100) and (002) diffraction profiles reveals highly anisotropic lattice dynamics of BNNTs, which can be attributed to the distinct nature of the chemical bonds in the tubular structure. Moreover, the changes in (002) diffraction positions and intensities suggest that the lattice response of BNNTs to the femtosecond laser excitation involves a fast and a slow lattice dynamic process. The fast process with a time constant of about 8 picoseconds can be understood to be a result of electron–phonon coupling, while the slow process with a time constant of about 100 to 300 picoseconds depending on pump laser fluence is tentatively associated with an Auger recombination effect. In addition, we discuss the power–law relationship of a three-photon absorption process in the BNNT nanoscale system.

Graphical abstract: Ultrafast structural dynamics of boron nitride nanotubes studied using transmitted electrons

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Supplementary files

Article information


Submitted
11 Jun 2017
Accepted
04 Aug 2017
First published
09 Aug 2017

Nanoscale, 2017,9, 13313-13319
Article type
Paper

Ultrafast structural dynamics of boron nitride nanotubes studied using transmitted electrons

Z. Li, S. Sun, Z. Li, M. Zhang, G. Cao, H. Tian, H. Yang and J. Li, Nanoscale, 2017, 9, 13313
DOI: 10.1039/C7NR04162D

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