TY - JOUR
T1 - Formation of self-assembled monolayer of curcuminoid molecules on gold surfaces
AU - Berlanga, Isadora
AU - Etcheverry-Berríos, Álvaro
AU - Mella, Andy
AU - Jullian, Domingo
AU - Gómez, Victoria Alejandra
AU - Aliaga-Alcalde, Núria
AU - Fuenzalida, Victor
AU - Flores, Marcos
AU - Soler, Monica
N1 - Funding Information:
This work has been partially financed by the Chilean government under grant PIA-ACT1117 and Fondecyt Projects 1110206 , 1140759 and 3150014 . Dr. N. A.-A. thanks to the MINECO (Ref: MAT2013-47869-C4-2-P ). Mr. A. E.-B. acknowledges the scholarship for his PhD through Conicyt PFCHA grant 21140734 . This research was also partially supported by the supercomputing infrastructure of the NLHPC ( ECM-02 ) (Powered@NLHPC).
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/9/18
Y1 - 2016/9/18
N2 - We investigated the formation of self-assembled monolayers of two thiophene curcuminoid molecules, 2-thphCCM (1) and 3-thphCCM (2), on polycrystalline gold substrates prepared by immersion of the surfaces in a solution of the molecules during 24 h. The functionalized surfaces were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Despite the fact that both molecules have the same composition and almost the same structure, these molecules exhibit different behavior on the gold surface, which can be explained by the different positions of the sulfur atoms in the terminal aromatic rings. In the case of molecule 1, the complete formation of a SAM can be observed after 24 h of immersion. In the case of molecule 2, the transition from flat-lying to upright configuration on the surface is still in process after 24 h of immersion. This is attributed to the fact that molecule 2 have the sulfur atoms more exposed than molecule 1.
AB - We investigated the formation of self-assembled monolayers of two thiophene curcuminoid molecules, 2-thphCCM (1) and 3-thphCCM (2), on polycrystalline gold substrates prepared by immersion of the surfaces in a solution of the molecules during 24 h. The functionalized surfaces were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Despite the fact that both molecules have the same composition and almost the same structure, these molecules exhibit different behavior on the gold surface, which can be explained by the different positions of the sulfur atoms in the terminal aromatic rings. In the case of molecule 1, the complete formation of a SAM can be observed after 24 h of immersion. In the case of molecule 2, the transition from flat-lying to upright configuration on the surface is still in process after 24 h of immersion. This is attributed to the fact that molecule 2 have the sulfur atoms more exposed than molecule 1.
KW - Curcumin derivatives
KW - Curcuminoid
KW - Polycrystalline gold surface
KW - Self-assembled monolayers (SAMs)
KW - STM
KW - XPS
U2 - 10.1016/j.apsusc.2016.09.077
DO - 10.1016/j.apsusc.2016.09.077
M3 - Article
AN - SCOPUS:84988719289
SN - 0169-4332
VL - 392
SP - 834
EP - 840
JO - Applied Surface Science
JF - Applied Surface Science
ER -