| Abstract
| - Alkyl organic monolayers with different alkyl molecular chain lengths directly attached to silicon were preparedat 160 °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 effectof the molecular chain length on the molecular arrangement and packing density of the monolayers. Water contactangle and XPS measurements showed that C12, C14, and C16 monolayers have a comparably higher quality, whilethe quality of C10 and C18 monolayers is worse. GIXD revealed that the alkyl monolayers directly attached to theSi were all amorphously structured regardless of their alkyl chain length. The amorphous structure of the alkylmonolayers could be attributed to the rigid Si−C bonding, low quality of hydrogen-terminated silicon substrate, and/orlow mobility of physisorbed molecules.
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