Study of alkyl organic monolayers with different molecular chain lengths directly attached to silicon.
Study of alkyl organic monolayers with different molecular chain lengths directly attached to silicon.
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DOI：
10.1021/la052342u
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
T. Ishizaki;N. Saito;Lee SunHyung;K. Ishida;O. Takai
中科院分区：
文献类型：
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作者：
T. Ishizaki;N. Saito;Lee SunHyung;K. Ishida;O. Takai
在160 ℃下由1-癸烯（C10）、1-十二碳烯（C12）、1-十四碳烯（C14）、1-十六碳烯（C16）和1-十八碳烯（C18）制备具有直接连接到硅的不同烷基分子链长度的烷基有机单层。这些单分子膜的水接触角测量，椭圆偏振，X射线反射率（XR），X射线光电子能谱（XPS），和掠入射X射线衍射（GIXD）的基础上，其特征在于阐明的分子链长度上的分子排列和堆积密度的单分子膜。水接触角和XPS测量表明，C12，C14和C16单分子膜具有较高的质量，而C10和C18单分子膜的质量较差。GIXD显示，直接连接到Si的烷基单层都是无定形结构，无论其烷基链的长度。烷基单分子膜的无定形结构可归因于刚性Si-C键合、低质量的氢封端的硅衬底和/或低迁移率的物理吸附分子。
Alkyl organic monolayers with different alkyl molecular chain lengths directly attached to silicon were prepared at 160 degrees C from 1-decene (C10), 1-dodecene (C12), 1-tetradecene (C14), 1-hexadecene (C16), and 1-octadecene (C18). These monolayers were characterized on the basis of water contact angle measurement, ellipsometry, X-ray reflectivity (XR), X-ray photoelectron spectroscopy (XPS), and grazing incidence X-ray diffraction (GIXD) to elucidate the effect of the molecular chain length on the molecular arrangement and packing density of the monolayers. Water contact angle and XPS measurements showed that C12, C14, and C16 monolayers have a comparably higher quality, while the quality of C10 and C18 monolayers is worse. GIXD revealed that the alkyl monolayers directly attached to the Si were all amorphously structured regardless of their alkyl chain length. The amorphous structure of the alkyl monolayers could be attributed to the rigid Si-C bonding, low quality of hydrogen-terminated silicon substrate, and/or low mobility of physisorbed molecules.