Abstract
We investigated alkanethiol phase-separated SAMs (PS-SAMs) with different head groups using noncontact atomic force microscopy (NC-AFM). Two kinds of PS-SAMs were prepared composed of 1-dodecanethiol (C12)/3-mercapto-1-propanol (C3OH) and C12/11-mercapto-1-undecanol (C11OH). We obtained the topographic, energy dissipation, and surface potential (SP) images of each sample. All the images clearly showed the feature of phase separation. Additionally, in the case of C12/C11OH PS-SAMs, the tip-to-sample distance dependence of frequency shift (Δf) and energy dissipation were measured on each domain, which also exhibited a difference in molecular species. We discussed them in terms of the difference in the molecular arrangement, dipole moment and hydrophobic/hydrophilic properties of the head groups.
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