• 文献标题:   Influence of growing conditions on the reactivity of Ni supported graphene towards CO
  • 文献类型:   Article
  • 作  者:   CELASCO E, CARRARO G, SMERIERI M, SAVIO L, ROCCA M, VATTUONE L
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF CHEMICAL PHYSICS
  • ISSN:   0021-9606 EI 1089-7690
  • 通讯作者地址:   Univ Genoa
  • 被引频次:   4
  • DOI:   10.1063/1.4978234
  • 出版年:   2017

▎ 摘  要

Free standing graphene is chemically inert but, as recently demonstrated, CO chemisorption occurs at lowcrystal temperature on the single layer grown by ethene dehydrogenation on Ni(111). Such layer is inhomogeneous since different phases coexist, the relative abundance of which depends on the growth conditions. Here we show by X ray photoemission and high resolution electron energy loss spectroscopies that the attained CO coverage depends strongly on the relative weight of the different phases as well as on the concentration of carbon in the Ni subsurface region. Our data show that the chemical reactivity is hampered by the carbon content in the substrate. The correlation between the amount of adsorbed CO and the weight of the different graphene phases indicates that the top-fcc configuration is the most reactive. Published by AIP Publishing.