Article

Surface wettability and spectroscopic studies on miscibility and ion adsorption of binary biomimetic self-assembled monolayers on gold surfaces

Korean Journal of Chemical Engineering (impact factor: 0.99). 05/2012; 26(3):691-696. DOI:10.1007/s11814-009-0115-9 pp.691-696

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.

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Keywords

adsorption
 
applicable potential
 
bands
 
binary SAMs
 
Binary self-assembled monolayers
 
FTIR spectra
 
FTIR spectroscopy
 
gold surfaces
 
good agreement
 
Israelachvili equation
 
mercaptohexadecanoic acid
 
miscibility
 
SAMs
 
two different molecules
 

Gil Sun Lee