Optical absorption spectra of palladium doped gold cluster cations

Abstract

Photoabsorption spectra of gas phase Au(n)(+) and Au(n-1)Pd(+) (13 ≤ n ≤ 20) clusters were measured using mass spectrometric recording of wavelength dependent Xe messenger atom photodetachment in the 1.9-3.4 eV photon energy range. Pure cationic gold clusters consisting of 15, 17, and 20 atoms have a higher integrated optical absorption cross section than the neighboring sizes. It is shown that the total optical absorption cross section increases with size and that palladium doping strongly reduces this cross section for all investigated sizes and in particular for n = 14-17 and 20. The largest reduction of optical absorption upon Pd doping is observed for n = 15.

Optical Absorption of Small Palladium‐Doped Gold Clusters

“…[42] A strong quenching effect of the absorption bands upon Pd doping was observed for all studied sizes, though with a noticeable size dependent alteration, and was attributed to dopant induced charge redistribution. In order to determine whether these effects extend down to the smallest clusters, in the current work, we investigate the effect of Pd on the optical absorption properties of Au 4 + , Au 4 + Ar, and Au 5 + Ar clusters in a broad photon energy range of 2.0-4.7 eV, using a combined photodissociation spectroscopy and time-dependent DFT (TDDFT) approach.…”

Altering CO binding on gold cluster cations by Pd-doping

“…Previous studies on Au clusters have shown that many of their physical and chemical properties can be tuned by the presence of a dopant atom. [41][42][43][44] The geometries, 45 optical properties, [46][47][48] and reactivities, 42,43,[49][50][51] of doped Au clusters are, therefore, expected to be different from those of their pure Au counterparts. A significant amount of research has been performed on investigating doping and mixing effects on the reactivity of binary metallic nanoparticles with CO molecules.…”

Effect of palladium doping on the stability and fragmentation patterns of cationic gold clusters

“…Pd doping is also interesting from a more applied point of view. Various studies have shown the influence of Pd in diverse properties of Au clusters, such as a quenching effect of the optical absorption in the visible range [25,26], an increase in the adsorption energies of molecules such as CO and O 2 [27], or an enhancement of the catalytic properties toward a variety of reactions [28][29][30]. Moreover, significant efforts have been devoted to the production and study of the properties of monolayer-protected Pd-doped Au clusters [31][32][33][34][35].…”