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Updated: Jul 13, 2026

Fabrication of Large-area Free-standing Ultrathin Polymer Films
Published on: June 3, 2015
Prediction of uncompensated polarity in ultrathin films
Jacek Goniakowski1, Claudine Noguera, Livia Giordano
1Institut des Nanosciences de Paris, Universités Paris 6-7 and UMR CNRS 7588, 140, rue de Lourmel, 75015 Paris, France.
Abstract:
Relying on first principles simulations of stoichiometric MgO, ZnO, and NaCl (1x1) ultrathin (111) films, we demonstrate the existence of a critical thickness below which polarity is uncompensated: the surface charges are bulklike, and the total dipole moment and the formation energy grow linearly with thickness. This study reveals novel facets of the problematics of polarity akin to the nanoscopic size of the objects and opens stimulating perspectives on polar nanostructures with surface properties and reactivity unaffected by charge compensation as in macroscopic samples.
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