Journal
NANOMATERIALS
Volume 8, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/nano8020086
Keywords
multi-walled BNNTs; anisotropic thermal expansion; transmission electron microscopy; in situ heating; thermal contraction
Categories
Funding
- National Key Research and Development Program of China [2016YFA0300303, 2017YFA0504703, 2017YFA0302900]
- National Basic Research Program of China 973 Program [2015CB921300]
- Natural Science Foundation of China [11447703, 11604372, 11474323, 11774403, 11774391]
- Chinese Academy of Sciences [XDB07020000, ZDKYYQ20170002]
- CAS Pioneer Hundred Talents Program B
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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.
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