2 research outputs found
Chemical Interface Damping Depends on Electrons Reaching the Surface
Metallic
nanoparticles show extraordinary strong light absorption
near their plasmon resonance, orders of magnitude larger compared
to nonmetallic nanoparticles. This “antenna” effect
has recently been exploited to transfer electrons into empty states
of an attached material, for example to create electric currents in
photovoltaic devices or to induce chemical reactions. It is generally
assumed that plasmons decay into hot electrons, which then transfer
to the attached material. Ultrafast electron–electron scattering
reduces the lifetime of hot electrons drastically in metals and therefore
strongly limits the efficiency of plasmon induced hot electron transfer.
However, recent work has revived the concept of plasmons decaying
directly into an interfacial charge transfer state, thus avoiding
the intermediate creation of hot electrons. This direct decay mechanism
has mostly been neglected, and has been termed chemical interface
damping (CID). CID manifests itself as an additional damping contribution
to the homogeneous plasmon line width. In this study, we investigate
the size dependence of CID by following the plasmon line width of
gold nanorods during the adsorption process of thiols on the gold
surface with single particle spectroscopy. We show that CID scales
inversely with the effective path length of electrons, i.e., the average
distance of electrons to the surface. Moreover, we compare the contribution
of CID to other competing plasmon decay channels and predict that
CID becomes the dominating plasmon energy decay mechanism for very
small gold nanorods
El siglo médico Tomo 20 Nº1014 p:337-352 (01/06/1873)
Encuadernada con el el año 1866, el tomo II del año 1865 de la revista Crónica médica Descripción basada en : Año IX, n. 418 ( en. 1862) Fusión de : Gaceta meÌdica (Madrid), ISSN 0214-4247 ; y de : BoletiÌn de medicina, cirugiÌa y farmacia, ISSN 0214-4255. Absorbió a : El genio médico, ISSN 0214-428X. Continuada por : Semana médica española, ISSN 1131-0049.v 30 cm 20 páginas