抄録
We investigated the frictional properties and the durability of self-assembled double layers on Au using a pin-on-plate tribometer and X-ray photoelectron spectroscopy (XPS). We found that double layers made from octadecanethiol (ODT) and mercaptohexadecanoic acid (MHA) connected via Cu ions exhibited lower frictional coefficients (approximately 0.1-0.15) than that of ODT monolayer (〜0.2). The frictional properties of self-assembled monolayers (SAMs) covalently bonded to silicon (Si) substrates through Si-C or Si-O-C bonds were also investigated using the pin-on-plate tribometer. Three kinds of molecules, which were 1-hexadecene, 1-hexadecanol and octadecyltrichlorosilane, with different head groups were used. SAMs with the Si-C bond of the head group exhibited lower friction coefficients, higher wear resistance and higher durability than those with the Si-O-C bond. The head group of the molecules affected the friction properties of the modified surfaces of the SAMs.
