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Ultrafast Structural Dynamics of Boron Nitride Nanotubes Studied Using Transmitted Electrons

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 a 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 about 8 picoseconds can be understood as due to the electron-phonon coupling, while the slow process with a time constant about 100 to 300 picoseconds depending on pump laser fluence is tentatively connected with the Auger recombination effect. In addition, we discuss the power-law relationship of three-photon absorption process in the BNNTs nanoscale system.

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Publication details

The article was received on 11 Jun 2017, accepted on 04 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04162D
Citation: Nanoscale, 2017, Accepted Manuscript
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    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, Accepted Manuscript , DOI: 10.1039/C7NR04162D

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