Surface wettability and spectroscopic studies on miscibility and ion adsorption of binary biomimetic self-assembled monolayers on gold surfaces
ABSTRACT Binary self-assembled monolayers (SAMs) have been much studied due to their high applicable potential as a model of biomimetic
surfaces. However, the research about miscibility of binary SAMs has not much been investigated yet. In this work, we focused
on analyzing the binary SAMs composed of mercaptohexadecanoic acid (MHA)-hexadecanthiol (HDT) on gold surfaces with Cassie
equation, Israelachvili equation, and FTIR spectroscopy to confirm that the binary SAMs are well mixed. As a result, MHA-HDT
binary SAMs are considered miscible because the result obtained from FTIR spectra is in good agreement with that calculated
by Israelachvili equation for the case that two different molecules are well mixed on the surface. Also, the adsorption of
cadmium ions on binary SAMs was confirmed by the appearance of carboxylate stretching bands.