Electronic shell structure and chemisorption on gold nanoparticles

Electronic shell structure and chemisorption on gold nanoparticles

Oxygen chemisorption on Au nanoparticles

Oxygen molecules do not adsorb on flat gold surfaces at room temperature, but recent experimental results have demonstrated adsorption of oxygen on small, negatively charged gold nanoparticles. Here we report first-principles density functional calculations of oxygen adsorption on neutral and charged Aun nanoparticles. We find that: (i) Oxygen molecules chemisorb on Aun clusters, with typical b...

The Effect of Cationic Gold on the Electronic Structure of Iron in Fe2O3-Supported Gold Nanoparticles

Sergio A. Jimenez-Lam, Gustavo A. Fuentes, Sergio A. Gómez, 2 Brent E. Handy, 3 María G. Cárdenas-Galindo, 3 Javier Guzman, 4 and Juan.C. Fierro-Gonzalez* Department of Chemical Engineering, Instituto Tecnológico de Celaya, Celaya, Guanajuato (Mexico) Department of Process Engineering, Universidad A. Metropolitana – Iztapalapa, A.P. 55-534, 09340 Mexico, D.F., (Mexico) Facultad de Ciencias Quím...

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...

A systematic growth of Gold nanoseeds on Silica for Silica@Gold core-shell nanoparticles and investigation of optical properties

Metal nanoshells consists of a dielectric core surrounded by a thin noble metal shell, possess unique optical properties, which render nanoshells attractive for use in different technologies. This paper reports a facile method for growth of small gold nanoparticles on the functionalized surface of larger silica nanoparticles. Mono-dispersed silica particles and gold nanoparticles were prepared ...