@article{oai:kanazawa-u.repo.nii.ac.jp:00009051,
 author = {淺川, 雅 and 福間, 剛士 and Inada, N. and Asakawa, Hitoshi and Matsumoto, Yoshiyasu and Fukuma, Takeshi},
 issue = {30},
 journal = {Nanotechnology},
 month = {Aug},
 note = {The structure and protein resistance of oligo(ethylene glycol)-terminated self-assembled monolayers (OEG-SAMs) have been studied intensively using various techniques. However, their molecular-scale surface structures have not been well understood. In this study, we performed molecular-resolution imaging of OH-terminated SAMs (OH-SAMs) and hexa(ethylene glycol) SAMs (EG 6OH-SAMs) formed on a Au(111) surface in an aqueous solution by frequency modulation atomic force microscopy (FM-AFM). The results show that most of the ethylene glycol (EG) chains in an EG6OH-SAM are closely packed and well-ordered to present a molecularly flat surface even in an aqueous solution. In addition, we found that EG6OH-SAMs have nanoscale defects, where molecules take a disordered arrangement with their molecular axes parallel to the substrate surface. We also found that the domain size (50-200 nm) of an EG6OH-SAM is much larger than that of OH-SAMs (10-40 nm). These findings should significantly advance molecular-scale understanding about the surface structure of OEG-SAMs. © 2014 IOP Publishing Ltd., 金沢大学ナノ生命科学研究所},
 title = {Molecular-scale surface structures of oligo(ethylene glycol)-terminated self-assembled monolayers investigated by frequency modulation atomic force microscopy in aqueous solution},
 volume = {25},
 year = {2014}
}