Formation and Tribology Study of Amide-Containing Stratified Self-Assembled Monolayers: Influences of the Underlayer Structure

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• 作者：Shiyong Song ; Ruiqing Chu ; Jinfang Zhou ; Shengrong Yang ; Junyan Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：March 13, 2008
• 年：2008
• 卷：112
• 期：10
• 页码：3805 - 3810
• 全文大小：113K
• 年卷期：v.112,no.10(March 13, 2008)
• ISSN：1932-7455

文摘

Three kinds of amide-containing stratified self-assembled films are grafted onto silicon surfaces by a two-step method. (3-Aminopropyl)triethoxylsilane (APS), N-[3-(trimethoxylsilyl)propyl]ethylenediamine (DA),and N-[3-(trimethoxylsilyl)propyl]diethylenetriamine (TA) are separately self-assembled on silicon surfacesto form the first layer followed by derivatization with lauroyl chloride to form the second layer via surfacecoupling reaction. The formation and structure of these films are characterized by means of contact anglemeasurement, ellipsometry, and attenuated total reflectance Fourier transform infrared spectroscopy. It isshown that DA and TA form more densely packed films than APS and the density of the amino-terminatedfilms largely affects the density of the subsequent lauroyl layer. A microtribological study of these films iscarried out with an atomic force microscope, and the macrotribological property is tested with a ball-on-platetribometer. The results indicate that the packing density of the films is greatly influenced by the underlayersof them, and therefore, their tribological performances are varied. The DAC12 film formed is more denselypacked and possesses a lower frictional coefficient than the other two.