caa a22 4500 60617396X CHVBK 20210128100735.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11244-014-0352-y doi (NATIONALLICENCE)springer-10.1007/s11244-014-0352-y Growth and Structure of Ni-Au Bimetallic Particles on Reducible CeO2(111) [Elektronische Daten] [Yinghui Zhou, Erik Peterson, Jing Zhou] The growth and sintering behavior of Ni-Au have been investigated on CeOx(111) (1.5<x<2) thin films with controlled oxidation states under ultrahigh vacuum conditions. Scanning tunneling microscopy studies reveal that pure Au grows three-dimensional particles with a submonolayer coverage at room temperature, while Ni prefers two-dimensional islands on ceria as a result of a stronger metal-ceria interaction. With heating, Au experiences extensive particle growth compared to Ni. In the study, bimetallic Ni-Au particles were prepared by deposition of 0.3ML Ni followed by 0.3ML Au on ceria. A larger fraction of deposited Au on the Ni particles dispersed on ceria. A small percent of Au was observed to form new pure Au particles on both ceria surfaces. With heating, both Au and Ni-Au particles sinter on CeO1.8 resulting in a bimodal particle size distribution. However, mostly Ni-Au bimetallic particles are present on CeO2. The different sintering behavior is attributed to the surface defects present on the reduced ceria. Such behavior was also observed in the study of ceria-supported Pt-Au bimetallic particles. Our study demonstrates that bimetallic Ni-Au particles can be prepared by deposition of Au on the existing Ni particles as "seeds” on both oxidized and partially reduced ceria. The growth and sintering behavior of Ni-Au bimetallic surfaces are dependent on the nature of ceria supports. Our study can provide morphological and size information for the understanding of the activity of ceria-supported Ni-Au catalysts. Graphical Abstract: Springer Science+Business Media New York, 2014 Ceria nationallicence Gold nationallicence Nickel nationallicence Platinum nationallicence Bimetallic nanoparticles nationallicence Scanning tunneling microscopy nationallicence X-ray photoelectron spectroscopy nationallicence Zhou Yinghui Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut Peterson Erik Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut Zhou Jing Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/2-3(2015-03-01), 134-142 1022-5528 58:2-3<134 2015 58 11244 https://doi.org/10.1007/s11244-014-0352-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-014-0352-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhou Yinghui Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 700 1- Peterson Erik Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 700 1- Zhou Jing Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/2-3(2015-03-01), 134-142 1022-5528 58:2-3<134 2015 58 11244