Mimicking Polymer Surfaces Using Cyclohexyl- and Perfluorocyclohexyl-Terminated Self-Assembled Monolayers
Mimicking Polymer Surfaces Using Cyclohexyl- and Perfluorocyclohexyl-Terminated Self-Assembled Monolayers
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使用环己基和全氟环己基封端的自组装单层模拟聚合物表面
DOI：
10.1021/acsanm.9b01268
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发表时间：
2019
影响因子：
5.9
通讯作者：
Lee, T. Randall
中科院分区：
文献类型：
--
作者：
Yu, Tianlang;Marquez, Maria D.;Zenasni, Oussama;Lee, T. Randall
本文介绍了两种环己基封端的烷硫醇（HCyHnSH; n = 10和11）及其氟化类似物C6 F11（CH 2）nSH（n = 10和11;FCyHnSH）的合成。这些环封端的吸附物被用来产生自组装单分子膜（SAM）的金表面上作为模型的金属基板上的聚合物界面。采用椭圆偏振仪、X射线光电子能谱（XPS）、偏振调制红外反射吸收光谱（PM-IRRAS）和接触角测定法对相应的自组装膜进行了表征。虽然椭偏厚度与单层形成一致，但XPS分析表明，thehCyHnSHSAMs比其氟碳类似物具有更大的堆积密度。然而，PM-IRRAS光谱显示，潜在的亚甲基单位在thHCyHnSHSAMs的构象有序性低于其氟碳类似物。在所有的表征中，没有观察到明显的“奇-偶”效应，无论是HCyHnSH或FCyHnSHSAMs，可能是由于庞大的和构象的灵活性的链末端。有趣的是，这些自组装膜和它们的聚合物类似物，聚乙烯（PE）和聚四氟乙烯（PTFE）的接触角的广泛的接触液体的比较，发现这些液体表现出类似的润湿性上的HCyHnSHSAMs和PE表面，并分别在FCyHnSHSAMs和PTFE表面。这些结果表明，这些自组装膜可以成功地作为纳米级聚合物膜的模拟物，并可用于未来的研究（例如，离子-表面碰撞和等离子体改性），而无需考虑表面重构。
This article describes the synthesis of two cyclohexyl-terminated alkanethiols (HCyHnSH; n = 10 and 11) and their fluorinated analogs C6F11(CH2)nSH (n = 10 and 11;FCyHnSH). These ring-terminated adsorbates were used to generate self-assembled monolayers (SAMs) on gold surfaces to serve as model polymeric interfaces on metal substrates. The corresponding SAMs were characterized using ellipsometry, X-ray photoelectron spectroscopy (XPS), polarization modulation infrared reflection–absorption spectroscopy (PM-IRRAS), and contact angle goniometry. While the ellipsometric thicknesses were consistent with monolayer formation, analysis by XPS indicated that theHCyHnSHSAMs exhibited greater packing densities than their fluorocarbon analogs. However, PM-IRRAS spectra revealed that the underlying methylene units in theHCyHnSHSAMs were less conformationally ordered than their fluorocarbon analogs. In all the characterizations, no discernible “odd–even” effect was observed in either theHCyHnSHor theFCyHnSHSAMs, plausibly due to the bulkiness and conformational flexibility of the chain termini. Interestingly, comparison of the contact angles of a wide range of contacting liquids on these SAMs and their polymeric analogs, polyethylene (PE) and polytetrafluoroethylene (PTFE), found that these liquids exhibited similar wettability on theHCyHnSHSAMs and PE surfaces, and separately on theFCyHnSHSAMs and PTFE surfaces. These results suggest that these SAMs can successfully act as mimics of nanoscale polymer films and can be used in future studies (e.g., ion-surface collisions and plasma modification) without concerns of surface reconstruction.
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第 11 章 – 聚合物涂层基本信息
DOI：
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发表时间：
2015
期刊：
影响因子：
--
作者：
C. A. Bishop
通讯作者：
C. A. Bishop
低能离子表面碰撞表征金上烷基和氟烷基封端的自组装单分子层
DOI：
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发表时间：
2002
期刊：
影响因子：
--
作者：
Darrin L. Smith;V. Wysocki;R. Colorado;O. E. Shmakova;M. Graupe;T. Lee
通讯作者：
T. Lee
影响因子：
3.9
作者：
Colorado, R;Lee, TR
通讯作者：
Lee, TR
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
J. Telegdi;T. Rigó;Erika Kálmán
通讯作者：
Erika Kálmán
DOI：
10.1021/la400040e
发表时间：
2013-03
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
S. Pujari;Luc Scheres;T. Weidner;J. Baio;M. Stuart;C. V. van Rijn;H. Zuilhof
通讯作者：
S. Pujari;Luc Scheres;T. Weidner;J. Baio;M. Stuart;C. V. van Rijn;H. Zuilhof