title: Electronic properties and charge transfer phenomena in Pt nanoparticles on γ-Al2O3: size, shape, support, and adsorbate effects.
abstract: This study presents a systematic detailed experimental and theoretical investigation of the electronic properties of size-controlled free and γ-Al(2)O(3)-supported Pt nanoparticles (NPs) and their evolution with decreasing NP size and adsorbate (H(2)) coverage. A combination of in situ X-ray absorption near-edge structure (XANES) and density functional theory (DFT) calculations revealed changes in the electronic characteristics of the NPs due to size, shape, NP-adsorbate (H(2)) and NP-support interactions. A correlation between the NP size, number of surface atoms and coordination of such atoms, and the maximum hydrogen coverage stabilized at a given temperature is established, with H/Pt ratios exceeding the 1 : 1 ratio previously reported for bulk Pt surfaces.
authors: Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
authors: F
authors: F
authors: Behafarid
authors: L K
authors: LK
authors: Ono
authors: S
authors: S
authors: Mostafa
authors: J R
authors: JR
authors: Croy
authors: G
authors: G
authors: Shafai
authors: S
authors: S
authors: Hong
authors: T S
authors: TS
authors: Rahman
authors: Simon R
authors: SR
authors: Bare
authors: B Roldan
authors: BR
authors: Cuenya