Atomistic Insights into Chemical Interface Damping of Surface Plasmon Excitations in Silver Nanoclusters

OSCAR A. DOUGLAS GALLARDO; OSCAR A. DOUGLAS GALLARDO; CRISTIÁN G. SÁNCHEZ; CRISTIÁN G. SÁNCHEZ; MATÍAS BERDAKIN; MATÍAS BERDAKIN

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Lugar: Washington; Año: 2016 vol. 120 p. 24389 - 24399

1932-7447

A detailed description of the mechanism underlying chemical interface damping (CID) in silver nanoclusters is presented. The effect of adsorbates on the surface plasmon excitation in silver nanoclusters is explored by means of a method based on time-dependent self-consistent-charge density-functional-tight-binding(TD-SCC-DFTB). By using this tool, we have calculated the homogeneous linewidth of the surface plasmon resonance (SPR) band for both naked and capped silver nanoclusters. A new picture explaining the decreased lifetime of the surface plasmon excitations isprovided, in which coupling between particles states via adsorbatestates enhances the natural dephasing mechanism of the surfaceplasmon excitation. To the best of our knowledge, this is the firstreport that addresses this topic from a fully atomistictime-dependent approach considering nano-sized particles.