Synthesis of hexagonal boron nitride 2D layers using polymer derived ceramics route and derivatives
Résumé
Hexagonal boron nitride (h-BN) is nowadays an increasingly attractive material, especially for
two-dimensional material applications, due to its intrisic properties. However, its properties are
highly dependent on the used synthesis approach. The Polymer Derived Ceramics (PDCs) route
allows elaboration of h-BN with tailored textural and structural properties. Here, we
demonstrate the interest of the PDCs pathway for the synthesis of h-BN. Growth of h-BN single
crystals with crystal sizes of a few microns at relatively low temperature and atmospheric
pressure is successfully achieved from borazine precursor using PDCs. The crystallization is
improved by additivation of 5 wt% of Li3N to the pre-ceramic polymer. Furthermore, by
coupling PDCs with gas pressure sintering, starting from the same pre-ceramic polymer and 25
wt% of Li3N, the crystal size is enlarged up to hundreds of microns. The fabricated single
crystals of pure h-BN can then be exfoliated into h-BN nanosheets. Finally, by combining PDCs
with atomic layer deposition, functional BN nano-/hetero-structures are successfully
synthesized from highly structured sensitive templates, making this ALD process a promising
alternative for fabricating functional BN nanostructures.
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2020-JPhys Materials focus issue-without marks.pdf (1.39 Mo)
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