title: γ-Fe₂O₃ nanoparticle surface controls PtFe nanoparticle growth and catalytic properties.
abstract: We report a novel method for synthesis of alloy PtFe nanoparticles (NPs) of different compositions using γ-Fe2O3 NPs as an iron source. We show here other growth mechanisms than conventional nucleation on a NP surface leading to core-shell NP or seeded NP growth. Depending on reaction conditions, different compositions of PtFe NPs can be obtained. PtFe NPs may coexist with γ-Fe2O3 NPs in the reaction product. This mixture obtained in situ allows much higher catalytic activity in hydrogenation of methyl-3-buten-2-ol than that of only PtFe nanoparticles or merely mixed PtFe and γ-Fe2O3 NPs. The presence of both PtFe and γ-Fe2O3 NPs allows formation of dense and stable NP arrays which hold promise for catalytic applications in microreactors or other reactor designs where a catalytic film is favoured.
authors: Indiana University, Department of Chemistry, 800 E. Kirkwood Av., Bloomington, IN 47405, USA.
authors: Gregory
authors: G
authors: Gumina
authors: Rosemary
authors: R
authors: Easterday
authors: Andrey G
authors: AG
authors: Malyutin
authors: Angela M
authors: AM
authors: Budgin
authors: Barry D
authors: BD
authors: Stein
authors: Linda Zh
authors: LZh
authors: Nikoshvili
authors: Valentina G
authors: VG
authors: Matveeva
authors: Esther M
authors: EM
authors: Sulman
authors: David Gene
authors: DG
authors: Morgan
authors: Lyudmila M
authors: LM
authors: Bronstein