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Direct Observation of Inner-Layer Inward Contractions of Multiwalled Boron Nitride Nanotubes upon in Situ Heating

1
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3
Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(2), 86; https://doi.org/10.3390/nano8020086
Received: 18 January 2018 / Revised: 28 January 2018 / Accepted: 30 January 2018 / Published: 4 February 2018
(This article belongs to the Special Issue Boron Nitride Nanostructures)
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Abstract

In situ heating transmission electron microscopy observations clearly reveal remarkable interlayer expansion and inner-layer inward contraction in multi-walled boron nitride nanotubes (BNNTs) as the specimen temperature increases. We interpreted the observed inward contraction as being due to the presence of the strong constraints of the outer layers on radial expansion in the tubular structure upon in situ heating. The increase in specimen temperature upon heating can create pressure and stress toward the tubular center, which drive the lattice motion and yield inner diameter contraction for the multi-walled BNNTs. Using a simple model involving a wave-like pattern of layer-wise distortion, we discuss these peculiar structural alterations and the anisotropic thermal expansion properties of the tubular structures. Moreover, our in situ atomic images also reveal Russian-doll-type BN nanotubes, which show anisotropic thermal expansion behaviors. View Full-Text
Keywords: multi-walled BNNTs; anisotropic thermal expansion; transmission electron microscopy; in situ heating; thermal contraction multi-walled BNNTs; anisotropic thermal expansion; transmission electron microscopy; in situ heating; thermal contraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, Z.; Li, Z.-A.; Sun, S.; Zheng, D.; Wang, H.; Tian, H.; Yang, H.; Bai, X.; Li, J. Direct Observation of Inner-Layer Inward Contractions of Multiwalled Boron Nitride Nanotubes upon in Situ Heating. Nanomaterials 2018, 8, 86.

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