Graphene analogues of BN: novel synthesis and properties

ACS Nano
Angshuman NagC N R Rao

Abstract

Enthused by the fascinating properties of graphene, we have prepared graphene analogues of BN by a chemical method with a control on the number of layers. The method involves the reaction of boric acid with urea, wherein the relative proportions of the two have been varied over a wide range. Synthesis with a high proportion of urea yields a product with a majority of 1-4 layers. The surface area of BN increases progressively with the decreasing number of layers, and the high surface area BN exhibits high CO(2) adsorption, but negligible H(2) adsorption. Few-layer BN has been solubilized by interaction with Lewis bases. We have used first-principles simulations to determine structure, phonon dispersion, and elastic properties of BN with planar honeycomb lattice-based n-layer forms. We find that the mechanical stability of BN with respect to out-of-plane deformation is quite different from that of graphene, as evident in the dispersion of their flexural modes. BN is softer than graphene and exhibits signatures of long-range ionic interactions in its optical phonons. Finally, structures with different stacking sequences of BN have comparable energies, suggesting relative abundance of slip faults, stacking faults, and structural in...Continue Reading

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Citations

May 15, 2013·ACS Applied Materials & Interfaces·Muhammad SajjadPeter Feng
Jun 29, 2012·Accounts of Chemical Research·C N R RaoK S Subrahmanyam
Jan 5, 2013·Chemical Reviews·Mingsheng XuHongzheng Chen
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Jan 11, 2013·ACS Nano·Qunhong WengDmitri Golberg
May 30, 2013·ACS Nano·Dattatray J LateC N R Rao
Feb 5, 2011·Science·Jonathan N ColemanValeria Nicolosi
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