Adsorption of dimethyl sulfide and methanethiolate on Ag and Au surfaces: Surface-enhanced Raman scattering and density functional theory calculation study

Tailoring the Shape of Anisotropic Core–Shell Au–Ag Nanoparticles in Dimethyl Sulfoxide

“…The absence of S–O stretching band in the SERS spectra after the silver growth and the significant shift of S 2p binding energies toward lower binding energies evidenced by XPS indicate that DMSO (sulfur oxidation state 0) was converted into reduced species. Indeed, the peak at 161.9 eV is consistent with adsorbed organic sulfide (or thiolate) on silver such as dimethylsulfide (sulfur oxidation state −II). − The minor contribution in the S 2p signal identified at 160.9 eV is very likely due to silver sulfide Ag 2 S where sulfur oxidation state is −II. , The close examination of SERS spectra in the region below 300 cm –1 reveals a shoulder at ∼270 cm –1 only for the DMSO-assisted silver growth on gold seeds. This is representative of Ag–S stretching band in Ag 2 S, which further strengthens our assumption of DMSO reduction …”

Scanning the Potential Energy Surface for Synthesis of Dendrimer-Wrapped Gold Clusters: Design Rules for True Single-Molecule Nanostructures

“…The adsorption energy is subchemisorption at approximately 0.3 eV. By comparison, methylthiomethane has a binding energy to gold of approximately 0.5 eV …”

“…By comparison, methylthiomethane has a binding energy to gold of approximately 0.5 eV. 43 The computed thioether bond strength is substantially weaker than a 1.7 eV alkanethiolÀgold bond, 44 which has two important consequences for the dendrimer-mediated gold nanoparticle synthesis. First, there is scope for self-correction in the dendrimerÀ gold complexation with the thioether sulfurs able to distribute themselves on the surface via quasireversible SÀAu bonds so as to obtain favorable dendrimer conformations.…”

Characterizing Substrate–Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy

“…The S K-edge XANES of the methionine-impregnated γ-Al 2 O 3 and Pd/γ-Al 2 O 3 revealed the various chemical states of S in each sample (see Figure a). The peak observed in all spectra around 2472.5 eV is attributed to S–C bonding in the methionine and is less intense in both γ-Al 2 O 3 and Pd/γ-Al 2 O 3 as a result of the S-to-metal/metal oxide surface binding. , Notably, the S–C feature for the Pd/γ-Al 2 O 3 was also further decreased and shifted toward a higher energy compared to the γ-Al 2 O 3 , likely as a result of the more intense Pd–S interaction between the methionine and Pd nanoparticles. , The bulk PdS sample did not exhibit the S–C feature, although this sample does show an intense pre-edge feature at 2470.5 eV, corresponding to the effect of Pd d - and S p -orbital hybridization on S s → p transitions. , The γ-Al 2 O 3 and Pd/γ-Al 2 O 3 samples also exhibit pre-edge features around 2470.5 eV that can be associated with metal–S interactions and correspond to the change in their respective S–C features; , however, the pre-edge of Pd/γ-Al 2 O 3 is much more intense and thus implies a bonding mode that is analogous to Pd–S in bulk PdS. We also note that multiple overlapping pre-edge features are discernible in the spectrum of Pd/γ-Al 2 O 3 , which are likely a result of Pd–S interactions similar to those in bulk PdS, as well as Pd–S interactions similar to those in metal–thiolate systems. , Taken together, the pre-edge and main absorption edge features support that Pd–S bonding is the major component of the stabilization of methionine in Pd/γ-Al 2 O 3 .…”