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Issue 14, 2014
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Dipolar polarization and piezoelectricity of a hexagonal boron nitride sheet decorated with hydrogen and fluorine

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Abstract

In contrast to graphene, a hexagonal boron nitride (h-BN) monolayer is piezoelectric because it is non-centrosymmetric. However, h-BN shows neither in-plane nor out-of-plane dipole moments due to its three-fold symmetry on the plane and the fact that it is completely flat. Here, we show that the controlled adsorption of hydrogen and/or fluorine atoms on both sides of a pristine h-BN sheet induces flatness distortion in a chair form and an out-of plane dipole moment. In contrast, a boat form has no out-of-plane dipole moment due to the alternating boron and nitrogen positions normal to the plane. Consequently, the chair form of surface-modified h-BN shows both in-plane and out-of-plane piezoelectric responses; while pristine h-BN and the boat form of decorated h-BN have only in-plane piezoelectric responses. These in-plane and out-of-plane piezoelectric responses of the modified h-BN are comparable to those in known three-dimensional piezoelectric materials. Such an engineered piezoelectric two-dimensional boron nitride monolayer can be a candidate material for various nano-electromechanical applications.

Graphical abstract: Dipolar polarization and piezoelectricity of a hexagonal boron nitride sheet decorated with hydrogen and fluorine

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Publication details

The article was received on 20 Sep 2013, accepted on 06 Feb 2014 and first published on 07 Feb 2014


Article type: Paper
DOI: 10.1039/C3CP53971G
Phys. Chem. Chem. Phys., 2014,16, 6575-6582

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    Dipolar polarization and piezoelectricity of a hexagonal boron nitride sheet decorated with hydrogen and fluorine

    M. Noor-A-Alam, H. J. Kim and Y. Shin, Phys. Chem. Chem. Phys., 2014, 16, 6575
    DOI: 10.1039/C3CP53971G

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