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- W2028442630 abstract "We investigate the interaction between water molecules and gold nanoclusters Aun through a systematic density functional theory study within both the generalized gradient approximation and the nonlocal van der Waals (vdW) density functional theory. Both planar (n = 6–12) and three-dimensional (3D) clusters (n = 17–20) are studied. We find that applying vdW density functional theory leads to an increase in the Au–Au bond length and a decrease in the cohesive energy for all clusters studied. We classify water adsorption on nanoclusters according to the corner, edge, and surface adsorption geometries. In both corner and edge adsorptions, water molecule approaches the cluster through the O atom. For planar clusters, surface adsorption occurs in a O-up/H-down geometry with water plane oriented nearly perpendicular to the cluster. For 3D clusters, water instead favors a near-flat surface adsorption geometry with the water O atom sitting nearly atop a surface Au atom, in agreement with previous study on bulk surfaces. Including vdW interaction increases the adsorption energy for the weak surface adsorption but reduces the adsorption energy for the strong corner adsorption due to increased water-cluster bond length. By analyzing the adsorption induced charge rearrangement through Bader's charge partitioning and electron density difference and the orbital interaction through the projected density of states, we conclude that the bonding between water and gold nanocluster is determined by an interplay between electrostatic interaction and covalent interaction involving both the water lone-pair and in-plane orbitals and the gold 5d and 6s orbitals. Including vdW interaction does not change qualitatively the physical picture but does change quantitatively the adsorption structure due to the fluxionality of gold nanoclusters." @default.
- W2028442630 created "2016-06-24" @default.
- W2028442630 creator A5057792619 @default.
- W2028442630 date "2012-01-10" @default.
- W2028442630 modified "2023-10-14" @default.
- W2028442630 title "Water monomer interaction with gold nanoclusters from van der Waals density functional theory" @default.
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- W2028442630 doi "https://doi.org/10.1063/1.3675494" @default.
- W2028442630 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22260605" @default.
- W2028442630 hasPublicationYear "2012" @default.
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