Probing chemical reactions on the nanometer scale: Inverted chemical force microscopy of reactive self-assembled monolayers

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• 作者：Dordi ; Barbara ; Pickering ; Jason P. ; Sch脙脙nherr ; Holger ; Vancso ; G. Julius
• 关键词：Atomic force microscopy ; Reflection spectroscopy ; Surface chemical reaction ; Wetting ; Gold ; Biological molecules 脙脙脙脙脙脙 nucleic acids ; Biological molecules 脙脙脙脙脙脙 proteins ; Esters
• 刊名：Surface Science
• 出版年：2004
• 期刊代码：104_00396028
• 类别：ch
• 出版时间：October 10, 2004
• 卷：570
• 期：1-2
• 页码：57-66
• 文件大小：418 K

摘要

The hydrolysis and aminolysis of 11,11芒芒芒-dithiobis(N-hydroxysuccinimidylundecanoate) (NHS-C₁₀) adsorbed as self-assembled monolayer (SAM) on gold surfaces were monitored on the nanometer scale by a novel approach termed 芒芒芒inverted芒芒芒 chemical force microscopy (iCFM). In iCFM the reactants are immobilized on an atomic force microscopy tip rather than on the substrate and the chemical reactions that take place at the surface of the tip are probed by force芒芒芒displacement measurements on an inert octadecanethiol-covered Au substrate. The information obtained is confined to the contact area at pull-off, which is of the order of only several nm². Thus interactions and hence reaction kinetics can be quantitatively studied on the level of 芒芒芒10芒芒芒100 molecules. In particular, iCFM data show that the aminolysis reaction on SAMs of NHS-C₁₀ is a spatially heterogeneous reaction. In addition information about the defect density of reactive SAMs can be obtained.