Oxidation of Alkylsilane-Based Monolayers on Gold

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• 作者：Thomas M. Owens ; Bonnie J. Ludwig ; Kevin S. Schneider ; Daniel R. Fosnacht ; Bradford G. Orr ; and Mark M. Banaszak Holl
• 刊名：Langmuir
• 出版年：2004
• 出版时间：October 26, 2004
• 年：2004
• 卷：20
• 期：22
• 页码：9636 - 9645
• 全文大小：263K
• 年卷期：v.20,no.22(October 26, 2004)
• ISSN：1520-5827

文摘

The oxidation of alkylsilane monolayers on Au has been studied by X-ray photoelectron spectroscopy,reflection-absorption infrared spectroscopy, contact-angle measurements, and scanning tunnelingmicroscopy. Exposure of the monolayers at 298 K to pure O₂ or H₂O (>5 × 10^-5 Torr and >150 000 L) doesnot cause oxidation. Ambient atmosphere only causes oxidation if direct sight lines are maintained to thesample. Ozone exposure results in rapid monolayer oxidation. Oxidation initially occurs only at the Siatom, resulting in formation of a cross-linked siloxane monolayer that retains alkyl surface termination.Prolonged ozone exposures result in the oxidation and subsequent loss of the alkyl chain.