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Thermal properties and formation mechanism of h‐ BN nanoneedles synthesized via carbothermic reduction reaction
Author(s) -
Ahmed Yasser Momtaz Zak,
ElSheikh Said Moawad,
Abd Allah Asmaa AbdElBaset,
Anwar Said
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12752
Subject(s) - materials science , boric acid , boron , boron nitride , raman spectroscopy , boron carbide , carbon fibers , chemical engineering , hexagonal boron nitride , carbothermic reaction , nitride , fourier transform infrared spectroscopy , carbide , analytical chemistry (journal) , nuclear chemistry , nanotechnology , metallurgy , chemistry , organic chemistry , composite material , physics , engineering , graphene , layer (electronics) , composite number , optics
Hexagonal boron nitride ( BN ) was synthesized through the carbothermic reduction reaction ( CRR ) of boric acid using lactose as a carbon source under the nitrogen atmosphere at 1500 ° C for 3 hours. The boron/carbon (B/C) molar ratio was controlled during the CRR , and the produced samples were investigated by XRD diffraction pattern, FTIR analysis, and Raman spectra. Boron carbide (B 4 C) was formed in samples that have a higher carbon content, in addition to boron nitride. While boron nitride pure sample was produced from lower carbon content samples. Formation of B 4 C was found to depend on the B/C molar ratio. The morphology of the produced powder was also investigated by SEM and TEM , which revealed that the samples consist of nanoneedles of BN and hexagonal particles of B 4 C. The vapor‐solid ( VS ) reaction mechanism was processed greatly with increasing boron amount, producing boron nitride nanoneedles, which compete with the liquid‐solid ( LS ) reaction mechanism. The physicochemical properties of the produced samples were studied by DTA , UV , PL , and AC impedance measurements, and revealed that the samples are promising to many proper applications.