Covalently Attached Monolayers on Crystalline Hydrogen-Terminated Silicon: Extremely Mild Attachment by Visible Light

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• 作者：Qiao-Yu Sun ; Louis C. P. M. de Smet ; Barend van Lagen ; Marcel Giesbers ; Peter C. Thü ; ne ; Johan van Engelenburg ; Frits A. de Wolf ; Han Zuilhof ; and Ernst J. R. Sudhö ; lter
• 刊名：Journal of the American Chemical Society
• 出版年：2005
• 出版时间：March 2, 2005
• 年：2005
• 卷：127
• 期：8
• 页码：2514 - 2523
• 全文大小：171K
• 年卷期：v.127,no.8(March 2, 2005)
• ISSN：1520-5126

文摘

A very mild method was developed for the attachment of high-quality organic monolayers oncrystalline silicon surfaces. By using visible light sources, from 447 to 658 nm, a variety of 1-alkenes and1-alkynes were attached to hydrogen-terminated Si(100) and Si(111) surfaces at room temperature. Thepresence and the quality of the monolayers were evaluated by static water contact angles, X-rayphotoelectron spectroscopy, and IR spectroscopy. Monolayers prepared by thermal, UV light, or visiblelight initiation were compared. Additionally, the ability of infrared reflection-absorption spectroscopy tostudy organic monolayers on silicon was explored. A reaction mechanism is discussed on the basis ofinvestigations of the reaction behavior of 1-alkenes with silicon wafers with varying types and levels ofdoping. Finally, a series of mixed monolayers derived from the mixed solutions of a 1-alkene and an chars/omega.gif" BORDER=0 >-fluoro-1-alkene were investigated to reveal that the composition of the mixed monolayers was directly proportionalto the molar ratio of the two compounds in the solutions.