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Intrinsic interaction between in-plane ferroelectric polarization and surface adsorption

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Abstract

The chemical properties of a ferroelectric surface are polarization dependent, the underlying nature of which is, however, far from being completely understood. One of the reasons is that when the polarization direction is perpendicular to the surface, the depolarization field may induce electronic or atomic reconstruction and thus change the chemistry of the ferroelectric surface in complicated ways. Instead, the in-plane polarization results in no depolarization field. Therefore, the chemical properties of a ferroelectric surface can be more intrinsically reflected by the interplay between the in-plane polarization and the surface adsorption. By using first-principles calculations, we study the effect of the strain-induced in-plane polarization on the adsorption of a series of molecules on the reduced rutile TiO2(110) surface. We reveal that it is the surface doping caused by the charge transfer between the adsorbates and the TiO2(110) surface that dominates the polarization-induced change of the adsorption energy, as a result of screening long-range Coulomb interactions. The electrostatic interaction between the polarization of the substrate and the polar molecule is of relatively less importance. We propose that charge transfer effects generally occur for ferroelectric surfaces with no localized surface states.

Graphical abstract: Intrinsic interaction between in-plane ferroelectric polarization and surface adsorption

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Publication details

The article was received on 11 Jun 2019, accepted on 05 Aug 2019 and first published on 06 Aug 2019


Article type: Paper
DOI: 10.1039/C9CP03286J
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Intrinsic interaction between in-plane ferroelectric polarization and surface adsorption

    Z. Wang and D. Shu, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP03286J

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