title: Synthesis of palladium nanoparticles on TiO2(110) using a beta-diketonate precursor.
abstract: The adsorption of palladium hexafluoracetylacetone (Pd(hfac)2) and nucleation of Pd nanoparticles on TiO2(110) surface were observed using scanning tunneling microscopy (STM). Surface species of Pd(hfac)* and Ti(hfac)* uniformly adsorbed on TiO2(110) upon exposure of Pd(hfac)2. No preferential nucleation was observed for the surface species. Atomic resolution STM images revealed that both Pd(hfac)* and Ti(hfac)* appeared on the metastable Ti(5c) sites. After annealing at 700 K, sub-nm Pd nanoparticles were observed across the TiO2(110) without preferential nucleation. The adsorption preferences of Pd(hfac), hfac, and atomic Pd on TiO2(110) surface were studied using density functional theory (DFT), and possible decomposition pathways of Pd(hfac)2 leading to the formation of Pd nucleation sites were presented.
authors: Energy Systems Division, Argonne National Laboratory, Lemont, IL 60439, USA. jelam@anl.gov.
authors: Yu
authors: Y
authors: Lei
authors: Bin
authors: B
authors: Liu
authors: Junling
authors: J
authors: Lu
authors: Xiao
authors: X
authors: Lin
authors: Li
authors: L
authors: Gao
authors: Nathan P
authors: NP
authors: Guisinger
authors: Jeffrey P
authors: JP
authors: Greeley
authors: Jeffrey W
authors: JW
authors: Elam