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Boron nitride nanotube growth via boron oxide assisted chemical vapor transport-deposition process using LiNO 3 as a promoter

Abstract : High-purity straight and discrete multiwalled boron nitride nanotubes (BNNTs) were grown via a boron oxide vapor reaction with ammonia using LiNO 3 as a promoter. Only a trace amount of boron oxide was detected as an impurity in the BNNTs by energy-dispersive X-ray (EDX) and Raman spectroscopies. Boron oxide vapor was generated from a mixture of B, FeO, and MgO powders heated to 1,150 °C, and it was transported to the reaction zone by flowing ammonia. Lithium nitrate was applied to the upper side of a BN bar from a water solution. The bar was placed along a temperature gradient zone in a horizontal tubular furnace. BNNTs with average diameters of 30–50 nm were mostly observed in a temperature range of 1,280–1,320 °C. At higher temperatures, curled polycrystalline BN fibers appeared. Above 1,320 °C, the number of BNNTs drastically decreased, whereas the quantity and diameter of the fibers increased. The mechanism of BNNT and fiber growth is proposed and discussed. [Figure not available see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
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Submitted on : Monday, July 15, 2019 - 6:07:06 PM
Last modification on : Thursday, May 12, 2022 - 2:33:34 PM

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A.T. Matveev, K.L. Firestein, A.E. Steinman, A.M. Kovalskii, O.I. Lebedev, et al.. Boron nitride nanotube growth via boron oxide assisted chemical vapor transport-deposition process using LiNO 3 as a promoter. Nano Research, 2015, 8 (6), pp.2063-2072. ⟨10.1007/s12274-015-0717-y⟩. ⟨hal-02184185⟩

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