Journal
PHYSICAL REVIEW B
Volume 80, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.165432
Keywords
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Funding
- Office of Naval Research
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Nanoscale-resolved dielectric properties of polypropylene/metal-oxide (alumina, PbTiO3) interfaces and of the corresponding surfaces are investigated via first-principles calculations. In order to ascertain the locality of the atomically resolved permittivity profiles, we propose a simple procedure to directly evaluate the real-space decay length of nonlocal effects in the dielectric susceptibility. Based on this decay length, the microscopic dielectric response is derived by using a convolution of rectangular and Gaussian filters as the averaging weight function. This procedure converges quickly to the bulk values in slabs of only moderate thicknesses, while providing atomic-layer-resolved permittivity profiles even in the presence of significant relaxations and surface structure. Our results show that (i) the surface-induced and interface-induced modifications to the dielectric permittivity in polymer/metal-oxide composites are localized to only a few atomic layers; (ii) the interface effects are mainly confined to the metal-oxide side; and (iii) metal-oxide particles larger than a few nanometers should retain the average macroscopic value of their bulk dielectric permittivities.
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