The interaction of CO molecules on Au-Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100)

Hsuan Lee, Zhen He Liao, Po Wei Hsu, Ting Chieh Hung, Yu Cheng Wu, Yuwei Lin, Jeng Han Wang, Meng Fan Luo

Research output: Contribution to journalArticle

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Abstract

The interaction of CO molecules adsorbed on Au-Rh bimetallic nanoclusters supported on an ordered thin film of Al2O3/NiAl(100) was studied, primarily with infrared reflection absorption spectroscopy and density-functional-theory calculations. The bimetallic clusters, grown by sequential deposition of vapor Au and Rh onto the Al2O3/NiAl(100) surface at 300 K, had diameters of 1.2-3.0 nm and heights of 0.4-1.2 nm; they had a fcc phase and grew in the orientation (100). The infrared absorption line for CO adsorbed on Au sites (COAu) of the bimetallic clusters at 110 K was narrow (centered about 2100 cm−1) and intense, which results largely from the small adsorption energy and large dipole moment of COAu, whereas that on Rh sites (CORh) was broad (1880-2100 cm−1) and weak, which contrasts also with its counterpart on pure Rh clusters. Upon increasing the temperature to remove COAu, the absorption line for CORh narrowed and the intensity increased; at 300 K, the line width decreased by 30-40% and the absorption intensity was enhanced by 40-60%. The former arose, after the desorption of COAu, from a decreased CO-CO interaction and inhomogeneous broadening; the latter corresponded to an enhanced dipole moment of CORh, attributed to a promoted charge transfer from the CORh-binding Rh to the neighboring Au and consequently increased charge donated from CORh to Rh. The varied IR absorption for adsorbed CO can thus serve as an indicator for the charge transfer between the components in bimetallic clusters.

Original languageEnglish
Pages (from-to)13362-13371
Number of pages10
JournalRSC Advances
Volume7
Issue number22
DOIs
Publication statusPublished - 2017 Jan 1

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Nanoclusters
Dipole moment
Carbon Monoxide
Charge transfer
Thin films
Molecules
Infrared absorption
Absorption spectroscopy
Linewidth
Density functional theory
Desorption
Vapors
Infrared radiation
Adsorption
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Lee, H., Liao, Z. H., Hsu, P. W., Hung, T. C., Wu, Y. C., Lin, Y., ... Luo, M. F. (2017). The interaction of CO molecules on Au-Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). RSC Advances, 7(22), 13362-13371. https://doi.org/10.1039/c7ra00482f

The interaction of CO molecules on Au-Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). / Lee, Hsuan; Liao, Zhen He; Hsu, Po Wei; Hung, Ting Chieh; Wu, Yu Cheng; Lin, Yuwei; Wang, Jeng Han; Luo, Meng Fan.

In: RSC Advances, Vol. 7, No. 22, 01.01.2017, p. 13362-13371.

Research output: Contribution to journalArticle

Lee, Hsuan ; Liao, Zhen He ; Hsu, Po Wei ; Hung, Ting Chieh ; Wu, Yu Cheng ; Lin, Yuwei ; Wang, Jeng Han ; Luo, Meng Fan. / The interaction of CO molecules on Au-Rh bimetallic nanoclusters supported on a thin film of Al2O3/NiAl(100). In: RSC Advances. 2017 ; Vol. 7, No. 22. pp. 13362-13371.
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