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Synthesis of boron nitride nanostructures from borates of alkali and alkaline earth metals

Abstract : Reactions of borates of alkali and alkaline earth metals with ammonia in a temperature range of 950-1250 °C are explored with respect to the nano-boron nitride syntheses. M 2 O(MO)·nB 2 O 3 borates, where M 2 = Li, Na, K, and M = Mg, Ca, Sr, Ba are studied for a molar ratio n = 0.5-5.0. It is found that various boron nitride (BN) nanostructures such as BN-nanotubes (BNNTs), graphene-like BN petals (BNGPs), and columnar porous BN (BNP) flakes grow depending on the borate composition and synthesis temperature. Both morphology and yield of BN-nanostructures depend on the basicity of the metal oxide and its fraction in the precursor borate. Borates of Li, Mg, and Ca demonstrate the highest ability to produce BNNTs. Borates of Na and K produce BNGPs in the whole range of investigated n values and temperatures. BNP flakes with pores of 10-100 nm are formed from Mg-borates with n andgt; 3. © 2015 The Royal Society of Chemistry.
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Submitted on : Monday, July 15, 2019 - 6:07:09 PM
Last modification on : Friday, January 24, 2020 - 11:22:37 AM

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A.T. Matveev, K.L. Firestein, A.E. Steinman, A.M. Kovalskii, I.V. Sukhorukova, et al.. Synthesis of boron nitride nanostructures from borates of alkali and alkaline earth metals. Journal of Materials Chemistry A, Royal Society of Chemistry, 2015, 3 (41), pp.20749-20757. ⟨10.1039/c5ta05831g⟩. ⟨hal-02184186⟩

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