Miscibility in two phase-separated binary self-assembled monolayers composed of hydrophilic components on Au(111)
Author affiliations
DOI:
https://doi.org/10.15625/2525-2321.2017-00440Keywords:
Binary self-assembled monolayers, miscibility, hydrophilic componentsAbstract
The typical characteristic of two binary self-assembled monolayer (SAMs) composed of 11-aminoundecanethiol hydrochloride (AUT), and 10-carboxy-1-decanethiol (MUA) in each and the other was 2-hydroxylethanethiol (MeOH) was investigated. The dependence of charges (Q), estimated from the peak areas in cyclic voltammograms on the mixing ratios of components (csolMeOH) indicated that QMUA = QMeOH at csolMeOH = 0.8, meanwhile QAUT = QMeOH at csolMeOH = 0.5, suggesting that adsorbed MUA molecules prevented the adsorption of MeOH molecules. Fourier transform infrared spectrometry (FTIR) showed the increase of band at 2855 cm-1 and 2965 cm-1, assigned to symmetric and asymmetric of CH2, respectively, of SAM of AUT, indicating the more perpendicular orientation of AUT molecules compared with MUA molecules on the Au(111) surface. This result interpreted the degree of phase separation in binary SAMs of AUT-MeOH compared with binary SAMs of MUA-MeOH.
Keywords. Binary self-assembled monolayers, miscibility, hydrophilic components.Downloads
References
J. C. Love, L. A. Estroff, J. K. Jennah et al. Self-assembled monolayers of thiolates on Metal as a form of nanotechnology, Chem. Rev., 105, 1103-1169 (2005).
D. Hobara, T. Kakiuchi. Domain structure of binary self-assembled monolayers composed of 3-mercapto-1-propanol and 1-tetradecanethiol on Au(111) prepared by coadsorption, Electrochem. Commun., 3, 154-157 (2001).
T. Kakiuchi, M. Iida, N. Gon, D. Hobara, S. Imabayashi, K. Niki. Miscibility of adsorbed 1-undecanethiol and 11-mercaptoundecanoic acid species in binary self-assembled monolayers on Au(111), Langmuir., 17, 1599-1603 (2001).
D. Hobara, K. Ueda, S. Imabayashi, M. Yamamoto, T. Kakiuchi. Phase separation of binary self-assembled thiol monolayers of of 2-mercaptoethanesulfonic acid and 1-octadecanethiol on Au(111), Electrochem., 67, 1218-1220 (1999).
Y. Ooi, D. Hobara, M. Yamamoto, T. Kakiuchi. Ideal nonideality in adsorption of 2-amino-ethanethiol and 2-mercaptoethane sulfonic acid to form electrostatically stabilized binary self-assembled monolayers on Au(111), Langmuir, 21, 11185-11189 (2005).
D. Capitao, R. Sahli, N. Raouafi, B. Limoges et al. Electro-assisted of binary self-assembled 1,2-dithiolane monolayers on gold with predictable composition, Chem. ElectroChem., 3, 1422-1428 (2016).
D. Bu, S. Riechers, J. Liang, G. Liu. Impact of nanografting on the local structure of ternary self-assembled monolayers, Nano Res., 8, 2102-2114 (2015).
A. Oliver, F. Meyer, J. -M. Raquez et al. Surface-initiated controlled polymersation as a convenient method for designing functional polymer brushes: From self-assembled monolayers to patented surfaces, Prog. Polym. Sci., 37, 157-181 (2012).
L. J. C. Jeuken, N. N. Daskalakis, X. Han et al. Phase separation in mixed self-assembled monolayers and its effect on biomimetic membranes, Sen. Act. B, 124, 501-509 (2007).
M. K. Strulson, D. M. Johnson, J. A. Maurer. Increase stability of glycol-terminated self-assembled monolayers for long term patterned cell culture, Langmuir, 28, 4318-4324 (2012).
P. H. Phong. Artificially phase separated ternary self-assembled monolayers composed of 11-amino-1-undecanethiol and 1-dodecanethiol and 10-carboxy-1-decanethiol on Au(111) prepared by electrochemically selective replacement technique, J. Chem., 53, 166-169 (2015).
P. H. Phong. Oppositely charged state formation of the homogenous binary self-assembled monolayers composed of 10-carboxy-1-decanethiol and 11-amino-1-undecanethiol on Au(111), J. Adv. Nat. Sci., 9, 289-298 (2008).
C. A. Widrig, C, Chung, M. D. Porter. The electrochemical desorption of n-alkanethiol monolayers from polycrystalline Au and Ag electrodes, J. Electroanal. Chem., 310, 335- 359 (1991).
S. Imabayashi, M. Iida, D. Hobara et al. Reductive desorption of carboxylic-acid-terminated alkanethiol monolayers from Au(111) surfaces, J. Electroanal. Chem., 428, 33-38 (1997).
D. Hobara, M. Ota, S. Imbayashi. Phase separation of binary self-assembled thiol monolayers composed of 1-hexadecanethiol and 3-mercaptopropionic acid on Au(111) studies by scanning tunneling microscopy and cyclic voltammetry, J. Electroanal. Chem., 444, 113-119 (1998).
P. H. Phong, V. V. Sokolov, N. Nishi, M. Yamamoto, T. Kakiuchi. Concentration-dependent switching of the mode of phase separation in ternary self-assembled monolayers of 2-mercaptoethanethiol sulfonic acid, 2-aminoethanethiol and 1-dodecanethiol on Au(111), J. Electroanal. Chem., 600, 35-44 (2007).
