Redshift of the Frohlich Resonance and Electron Pinning at the Surface of a Spherical Copper Nanoparticle Surrounded by Protons
Istomin I.E.1, Yastrebov S.G.1, Vasilevskaya T.N.1
1Ioffe Institute, St. Petersburg, Russia
Email: kesha22ist@gmail.com, yastrebov@mail.ioffe.ru
This work proposes a model describing the attachment of C-H bond protons to the surface of copper nanoparticles in an amorphous carbon nanocomposite modified with copper nanoclusters (a-C : H : <Cu>). It is shown that non-covalent interactions between the dipole moments of C-H bonds and induced charges in copper nanoparticles lead to electron localization near the particle surface - a phenomenon termed electron pinning. This effect is accompanied by shifts in the infrared absorption bands of C-H bonds and a reduction in electron density within the nanoparticle volume. As a result, the plasma frequency of the nanoparticle decreases, causing a redshift of the Frohlich resonance into the infrared spectral region. Keywords: amorphous carbon, non-covalent interactions, Frohlich resonance, plasmonics.
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