Curvature-Induced Anomalous Enhancement in the Work Function of Nanostructures.
J Phys Chem Lett
; 6(15): 2870-4, 2015 Aug 06.
Article
em En
| MEDLINE
| ID: mdl-26267172
ABSTRACT
An analytical theory to estimate the electronic work function in curved geometries is formulated under Thomas-Fermi approximation. The work function is framed as the work against the electrostatic self-capacitive energy. The contribution of surface curvature is characterized by mean and Gaussian curvature (through multiple scattering expansion). The variation in work function of metal and semimetal nanostructures is shown as the consequence of surface radius of curvature comparable to electronic screening length. For ellipsoidal particles, the maximum value of work function is observed at the equator and poles for oblate and prolate particles, respectively, whereas triaxial ellipsoid shows nonuniform distribution of the work function over the surface. Similarly, theory predicts manifold increase in the work function for a particle with atomic scale roughness. Finally, the theory is validated with experimental data, and it is concluded that the work function of a nanoparticle can be tailored through its shape.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article