In-situ polarization-dependent total-reflection fluorescence XAFS studies on the structure transformation of Pt clusters on α-Al2O3(0001)

Kiyotaka Asakura; Wang Jae Chun; Masayuki Shirai; Keiichi Tomishige; Yasuhiro Iwasawa

In-situ polarization-dependent total-reflection fluorescence XAFS studies on the structure transformation of Pt clusters on α-Al₂O₃(0001)

Kiyotaka Asakura, Wang Jae Chun, Masayuki Shirai, Keiichi Tomishige, Yasuhiro Iwasawa

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

Abstract

Structures of Pt species derived from Pt₄(μ-CH₃COO)₈ on an α-Al₂O₃(0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt₄ cluster framework was destroyed upon the deposition of Pt₄(μ-CH₃COO)₈ by the reaction on the α-Al₂O₃ surface at room temperature. The isolated Pt species were converted to one-atomic layer thick Pt rafts with the Pt-Pt distance of 0.273 nm when the cluster was treated with H₂ at 373 K. The raftlike Pt clusters were stabilized by the formation of direct Pt-O-Al bonding with the α-Al₂O₃ surface. The raftlike Pt clusters were redispersed to isolated oxidized Pt species by the reaction with NO. They were also transferred to three-dimensional Pt particles by reduction with H₂ at 773 K.

Original language	English
Pages (from-to)	5549-5556
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	101
Issue number	28
Publication status	Published - 1997 Jul 10
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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In-situ polarization-dependent total-reflection fluorescence XAFS studies on the structure transformation of Pt clusters on α-Al₂O₃(0001). / Asakura, Kiyotaka; Chun, Wang Jae; Shirai, Masayuki; Tomishige, Keiichi; Iwasawa, Yasuhiro.

In: Journal of Physical Chemistry B, Vol. 101, No. 28, 10.07.1997, p. 5549-5556.

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

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abstract = "Structures of Pt species derived from Pt4(μ-CH3COO)8 on an α-Al2O3(0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt4 cluster framework was destroyed upon the deposition of Pt4(μ-CH3COO)8 by the reaction on the α-Al2O3 surface at room temperature. The isolated Pt species were converted to one-atomic layer thick Pt rafts with the Pt-Pt distance of 0.273 nm when the cluster was treated with H2 at 373 K. The raftlike Pt clusters were stabilized by the formation of direct Pt-O-Al bonding with the α-Al2O3 surface. The raftlike Pt clusters were redispersed to isolated oxidized Pt species by the reaction with NO. They were also transferred to three-dimensional Pt particles by reduction with H2 at 773 K.",

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AU - Asakura, Kiyotaka

AU - Chun, Wang Jae

AU - Shirai, Masayuki

AU - Tomishige, Keiichi

AU - Iwasawa, Yasuhiro

PY - 1997/7/10

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AB - Structures of Pt species derived from Pt4(μ-CH3COO)8 on an α-Al2O3(0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt4 cluster framework was destroyed upon the deposition of Pt4(μ-CH3COO)8 by the reaction on the α-Al2O3 surface at room temperature. The isolated Pt species were converted to one-atomic layer thick Pt rafts with the Pt-Pt distance of 0.273 nm when the cluster was treated with H2 at 373 K. The raftlike Pt clusters were stabilized by the formation of direct Pt-O-Al bonding with the α-Al2O3 surface. The raftlike Pt clusters were redispersed to isolated oxidized Pt species by the reaction with NO. They were also transferred to three-dimensional Pt particles by reduction with H2 at 773 K.

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