Quantitative kinetic measurements of the esterification of self-assembled monolayers of mercaptoundecanol by trifluoroacetic anhydride using friction force microscopy.
Quantitative kinetic measurements of the esterification of self-assembled monolayers of mercaptoundecanol by trifluoroacetic anhydride using friction force microscopy.
复制标题
使用摩擦力显微镜定量动力学测量三氟乙酸酐对巯基十一醇自组装单层的酯化。
DOI：
10.1021/la900741y
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
G. Leggett
中科院分区：
文献类型：
--
作者：
T. Whittle;G. Leggett
摩擦力显微镜 (FFM) 作为一种定量表面分析技术，其发展的核心是在表面的组织和组成与从 FFM 获取的数据之间建立清晰的关系。作为实现这一目标的一步，FFM 已应用于测量表面限制反应的动力学，即三氟乙酸酐对醇封端的自组装单层 (SAM) 的酯化反应。最初使用接触角测角法研究动力学。发现所获得的数据可以通过朗缪尔吸附等温线很好地描述。还通过 X 射线光电子能谱监测反应进程，并使用 FFM 进行比较研究。通过对 FFM 数据进行简单的数值分析，可以获得表面成分的定量信息。衍生化分子分数的测量结果与 XPS 和接触角测角法获得的成分数据进行了比较，发现非常一致，明确确立了 FFM 作为定量表面分析技术的能力。
Central to the advancement of friction force microscopy (FFM) as a quantitative surface analysis technique is the establishment of clear relationships between the organization and composition of surfaces and data acquired from FFM. As a step toward this goal, FFM has been applied to measurement of the kinetics of a surface-confined reaction, namely, the esterification of alcohol-terminated self-assembled monolayers (SAMs) by trifluoroacetic anhydride. The kinetics were studied initially using contact angle goniometry. The data obtained were found to be well described by a Langmuir adsorption isotherm. The progress of the reaction was also monitored by X-ray photoelectron spectroscopy, and comparative studies carried out using FFM. By using a simple numerical analysis of the FFM data, it has been possible to obtain quantitative information on surface composition. The resulting measurements of the fraction of derivatized molecules have been compared with compositional data obtained from XPS and contact angle goniometry, and found to be in excellent agreement, establishing unequivocally the capability of FFM as a quantitative surface analysis technique.