Molecular Adsorption Changes the Quantum Structure of Oxide-Supported Gold Nanoparticles: Chemisorption versus Physisorption

Molecular Adsorption Changes the Quantum Structure of Oxide-Supported Gold Nanoparticles: Chemisorption versus Physisorption.

STM conductance spectroscopy and mapping has been used to analyze the impact of molecular adsorption on the quantized electronic structure of individual metal nanoparticles. For this purpose, isophorone and CO2, as prototype molecules for physisorptive and chemisorptive binding, were dosed onto monolayer Au islands grown on MgO thin films. The molecules attach exclusively to the metal-oxide bou...

adsorption versus dissociative chemisorption

Ž . Ab initio embedded cluster calculations of water interaction with the TiO 110 surface predict that molecular adsorption 2 is more favorable than dissociative chemisorption. Unlike all previous calculations, this result is in agreement with recent temperature-programmed desorption and modulated beams experiments. Calculated surface relaxation, water adsorption energy and the densities of ele...

Chemisorption sites of CO on small gold clusters and transitions from chemisorption to physisorption.

Gold clusters adsorbed with CO, Au(m)(CO)(n) (-) (m=2-5; n=0-7), were studied by photoelectron spectroscopy (PES). The first few CO adsorptions were observed to induce significant redshifts to the PES spectra relative to pure gold clusters. For each Au cluster, a critical CO number (n(c)) was observed, beyond which the PES spectra of Au(m)(CO)(n) (-) change very little with increasing n. n(c) w...

Electronic shell structure and chemisorption on gold nanoparticles

Cytotoxicity and antibacterial activity of gold-supported cerium oxide nanoparticles

BACKGROUND Cerium oxide nanoparticles (CeO2) have been shown to be a novel therapeutic in many biomedical applications. Gold (Au) nanoparticles have also attracted widespread interest due to their chemical stability and unique optical properties. Thus, decorating Au on CeO2 nanoparticles would have potential for exploitation in the biomedical field. METHODS In the present work, CeO2 nanoparti...