Growth of ordered ultrathin tungsten oxide films on pt(111)

Zhenjun Li; Zhenrong Zhang; Yu Kwon Kim; R. Scott Smith; Falko Netzer; Bruce D. Kay; Roger Rousseau; Zdenek Dohnálek

doi:10.1021/jp1108976

Growth of ordered ultrathin tungsten oxide films on pt(111)

Zhenjun Li, Zhenrong Zhang, Yu Kwon Kim, R. Scott Smith, Falko Netzer, Bruce D. Kay, Roger Rousseau, Zdenek Dohnálek

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Ordered ultrathin tungsten oxide films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO₃) ₃ trimers. The surface composition, structure, and morphology were determined using a combination of atomically resolved imaging, ensemble-averaged surface-sensitive spectroscopies, and DFT. We find that half of the (WO ₃)₃ tungsten atoms in the first layer get partially reduced to the (5+) oxidation state. The opening of the (WO₃) ₃ ring leads to the formation of a tungsten oxide layer with a zigzag chain structure with a c(4×2) periodicity. In the second layer, the (WO₃)₃ clusters remain intact and form an ordered (3×3) array of molecularly bound (WO₃)₃. DFT calculations provide a detailed understanding of the structure, oxidation states, and the vibrational frequencies for both the c(4×2) and (3×3) overlayers.

Original language	English
Pages (from-to)	5773-5783
Number of pages	11
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	13
DOIs	https://doi.org/10.1021/jp1108976
State	Published - Apr 7 2011
Externally published	Yes

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title = "Growth of ordered ultrathin tungsten oxide films on pt(111)",

abstract = "Ordered ultrathin tungsten oxide films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO3) 3 trimers. The surface composition, structure, and morphology were determined using a combination of atomically resolved imaging, ensemble-averaged surface-sensitive spectroscopies, and DFT. We find that half of the (WO 3)3 tungsten atoms in the first layer get partially reduced to the (5+) oxidation state. The opening of the (WO3) 3 ring leads to the formation of a tungsten oxide layer with a zigzag chain structure with a c(4×2) periodicity. In the second layer, the (WO3)3 clusters remain intact and form an ordered (3×3) array of molecularly bound (WO3)3. DFT calculations provide a detailed understanding of the structure, oxidation states, and the vibrational frequencies for both the c(4×2) and (3×3) overlayers.",

author = "Zhenjun Li and Zhenrong Zhang and Kim, {Yu Kwon} and Smith, {R. Scott} and Falko Netzer and Kay, {Bruce D.} and Roger Rousseau and Zdenek Dohn{\'a}lek",

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AU - Li, Zhenjun

AU - Zhang, Zhenrong

AU - Kim, Yu Kwon

AU - Smith, R. Scott

AU - Netzer, Falko

AU - Kay, Bruce D.

AU - Rousseau, Roger

AU - Dohnálek, Zdenek

PY - 2011/4/7

Y1 - 2011/4/7

N2 - Ordered ultrathin tungsten oxide films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO3) 3 trimers. The surface composition, structure, and morphology were determined using a combination of atomically resolved imaging, ensemble-averaged surface-sensitive spectroscopies, and DFT. We find that half of the (WO 3)3 tungsten atoms in the first layer get partially reduced to the (5+) oxidation state. The opening of the (WO3) 3 ring leads to the formation of a tungsten oxide layer with a zigzag chain structure with a c(4×2) periodicity. In the second layer, the (WO3)3 clusters remain intact and form an ordered (3×3) array of molecularly bound (WO3)3. DFT calculations provide a detailed understanding of the structure, oxidation states, and the vibrational frequencies for both the c(4×2) and (3×3) overlayers.

AB - Ordered ultrathin tungsten oxide films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO3) 3 trimers. The surface composition, structure, and morphology were determined using a combination of atomically resolved imaging, ensemble-averaged surface-sensitive spectroscopies, and DFT. We find that half of the (WO 3)3 tungsten atoms in the first layer get partially reduced to the (5+) oxidation state. The opening of the (WO3) 3 ring leads to the formation of a tungsten oxide layer with a zigzag chain structure with a c(4×2) periodicity. In the second layer, the (WO3)3 clusters remain intact and form an ordered (3×3) array of molecularly bound (WO3)3. DFT calculations provide a detailed understanding of the structure, oxidation states, and the vibrational frequencies for both the c(4×2) and (3×3) overlayers.

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ER -

Growth of ordered ultrathin tungsten oxide films on pt(111)

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