In Situ Scanning Tunneling Microscopy and X-ray Photoelectron Spectroscopy Studies of Ethylene-Induced Structural Changes on the Pt(100)-hex Surface

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• 作者：Zhongwei Zhu ; Derek R. Butcher ; Baohua Mao ; Zhi Liu ; Miquel Salmeron ; Gabor A. Somorjai
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 14, 2013
• 年：2013
• 卷：117
• 期：6
• 页码：2799-2804
• 全文大小：360K
• 年卷期：v.117,no.6(February 14, 2013)
• ISSN：1932-7455

文摘

We have studied the structures of the Pt(100) surface in the presence of gas-phase ethylene at room temperature. High-pressure scanning tunneling microscopy shows that the hexagonal reconstruction on the clean Pt(100) surface is preserved under 1 Torr of C₂H₄, which produces an ethylidyne and di-蟽-bonded ethylene saturated surface. At 5 脳 10^鈥? Torr of C₂H₄, coadsorbed CO from the background gases lifts the reconstruction, with the excess Pt atoms from the hexagonal surface forming islands on the surface. The chemisorption of CO from background gases in the vacuum system, in the nominally pure C₂H₄, is revealed by ambient-pressure X-ray photoelectron spectroscopy.