Synthesis of boron nitride nanostructures from borates of alkali and alkaline earth metals. Issue 41 (22nd September 2015)

• Record Type: Journal Article
• Authors: Matveev, Andrei T.; Firestein, Konstantin L.; Steinman, Alexander E.; Kovalskii, Andrey M.; Sukhorukova, Irina V.; Lebedev, Oleg I.; Shtansky, Dmitry V.; Golberg, Dmitri
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 41(2015)
• Page Start: 20749
• Page End: 20757
• Publication Date: 2015-09-22
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5ta05831g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Boron nitride nanostructures (nanotubes, graphene-like petals, and columnar porous flakes) grew in reactions of alkali and alkaline earth borates with ammonia. 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. M2 O(MO)· n B2 O3 borates, where M2 = 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 > 3.