Miscibility of Adsorbed 1-Undecanethiol and 11-Mercaptoundecanoic Acid Species in Binary Self-Assembled Monolayers on Au(111)

Kakiuchi, Takashi; Iida, Minehiko; Gon, Narutoshi; Hobara, Daisuke; Imabayashi, Shin Ichiro; Niki, Katsumi

doi:10.1021/la0014757

“…Secondly, the homogeneous mixing takes place when there is no significant difference of the interaction energies between A-A and B-B pairs and the A-B pair [48]. Finally, when the interaction between A and B is much stronger than those of the similar molecules, a homogeneously mixed SAMs, whose surface mixing ratio is constant without depending on the mixing ratio of thiols in the adsorption solution were obtained, as has been found in the binary SAMs of AET and MES [47].…”

Section: Effect Of the Ratios Of T-cooh To T-nh 2 On Voltammetric Behmentioning

confidence: 99%

Voltammetry of immobilized cytochrome c on novel binary self-assembled monolayers of thioctic acid and thioctic amide modified gold electrodes

Ji

¹

,

Jin

²

,

Jin

³

et al. 2006

Journal of Electroanalytical Chemistry

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Horse heart cytochrome c (cyt c) was adsorbed on the binary self-assembled monolayers (SAMs) composed of thioctic acid (T-COOH) and thioctic amide (T-NH 2 ) at gold electrodes via electrostatic interaction. The cyt c adsorbed on the modified gold electrode exhibited well-defined reversible electrochemical behavior in 10 mM phosphate buffer solution (PBS, pH 7.0). The surface concentration (Г) of electroactive species, cyt c, on the binary SAMs was higher than that in single-component SAMs of T-COOH, and reached a maximum value of 9.2×10 -12 mol cm -2 when the ratio of T-COOH to T-NH 2 in adsorption solution was of 3:2, and the formal potential

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“…Binary mixed SAMs of various alkanethiols have already been investigated to a great extent by contact-angle measurements, 6 ellipsometry, X-ray photoelectron spectroscopy, 67 voltammetry of their reductive desorption, [64][65][66] and scanning tunneling microscopy. 65,66 Other previous work dealt with their surface property and the miscibility of two components.…”

Section: Effect Of Mixed Sam (Cooh/ch3)mentioning

confidence: 99%

“…65,66 Other previous work dealt with their surface property and the miscibility of two components. 66 MHA/HT mixed SAMs were prepared by a standard procedure using ethanol solutions containing MHA and HT with different mole fractions of them and a constant total concentration of 1 mM.…”

Section: Effect Of Mixed Sam (Cooh/ch3)mentioning

confidence: 99%

“…65,66 Other previous work dealt with their surface property and the miscibility of two components. 66 MHA/HT mixed SAMs were prepared by a standard procedure using ethanol solutions containing MHA and HT with different mole fractions of them and a constant total concentration of 1 mM. 65,66 Both components of the mixed SAM used in this study had the same-length alkyl chain, i.e., five methylene units between the terminal groups (-COOH for MHA and -CH3 for HT) and the sulfur atom.…”

Section: Effect Of Mixed Sam (Cooh/ch3)mentioning

confidence: 99%

“…4 the MHA/HT SAM could be co-adsorbed equally in its formation process, as expected for such mixed SAMs composed of thiols having a similar alkyl chain length, but different terminal groups. 66 …”

Section: Composition Of Mixed Samsmentioning

confidence: 99%

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Effect of Intramonolayer Hydrogen Bonding of Carboxyl Groups in Self-assembled Monolayers on a Single Force with Phenylurea on an AFM Probe Tip

Kado

¹

,

Murakami

²

,

Kimura

³

2006

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IntroductionDuring the recent decade, atomic force microscopy (AFM) has attracted much attention as a promising analytical tool for precisely measuring intermolecular forces.1-5 AFM can be used to detect the force between its probe tip and substrate surfaces, even at the pN level. It is thus of great importance that there is almost no limitation of the environment and conditions where the AFM force measurements are carried out. Thus, if the AFM probe tip and the substrate are modified chemically with selfassembled monolayers (SAMs) 6,7 terminating with target functional groups, the intermolecular force in their molecular pairs can be evaluated by force-curve measurements in appropriate solvents by AFM. [8][9][10][11][12][13][14][15][16][17][18][19]36 Furthermore, the individual force for a variety of intermolecular forces at a single-molecule level can also be evaluated by statistical analyses of the forces obtained by repetitive adhesion force measurements. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]37,38 In our previous studies, we measured specific intermolecular forces attributable to the characteristic molecular functionalities of the functional molecules, such as crown ether 36,37 and spirobenzopyran 38 derivatives, attached covalently on the probe tips. These functionalized AFM probe tips, which possess a powerful capability of detecting supramolecular interactions, can be potentially utilized for developing a novel analytical tool for surface analysis based on force sensing by AFM.In such AFM force measurements, SAMs are often used for conveniently established covalent bonding of the target molecules onto the surfaces of the tip and substrate. Then, the intramonolayer interaction between the components in the SAMs can be expected to affect the force observed by the AFM technique. In other words, the AFM technique could detect such effects as the intramonolayer interaction on the interaction between the tip and the substrate. Intramonolayer hydrogen bonding is crucial in the SAMs of thiols or silanes bearing a terminal functional group, which can form hydrogen bondings between themselves. For example, terminal carboxyl groups in the SAMs of ω-carboxyalkanethiol can easily form hydrogen bonding within the monolayers. 39-42The COOH-terminated SAMs, such as thiol and silane, have been analyzed by FT-IR spectroscopy. 44 Especially, in the case of COOH-terminated SAMs, the effect of the intramonolayer hydrogen bonding between the neighboring carboxyl groups in the SAMs had been considered with respect to their surface property, such as wettability 45 and surface acidity (pKa) of the carboxyl groups. [41][42][43] In the present paper, we report an AFM force spectroscopic study concerning the effect of intramonolayer hydrogen bonding in COOH-terminated SAMs of 6-mercaptohexanoic acid (MHA) on the adhesion force observed between a SAM of MHA and a phenylurea derivative attached to the substrate and probe tip, respectively.Urea derivatives have a powerful ability to form hydrogen bondings, sin...

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Electrochemistry of Gold*Dedicated to the memory of Professor Ralph N. Adams, a respected and unforgettable electrochemist and man

Orlik

¹

,

Galus

²

2006

Encyclopedia of Electrochemistry

1

0

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The sections in this article are Preparation of Au Surfaces and Double‐layer Properties Polycrystalline ( pc ‐ Au ) and Single‐crystal Au / H 2 O Interface pc ‐ Au and Single‐crystal Au /Nonaqueous Solutions Interface Adsorption of Inorganic Compounds on Gold Electrodes Sulfate Hydroxide Nitrate Chloride Bromide Iodide Cyanide Thiocyanate Other Inorganic Species Adsorption of Organic Compounds on Gold Electrodes Adsorption of Sulfur‐containing Compounds Adsorption of Thiols Adsorption of Modified Thiols Adsorption of Thiourea Adsorption of Disulfides and Related Compounds Other Sulfur Compounds and Complex Adsorption Layers Adsorption of Selenium‐containing Compounds Adsorption of Nitrogen‐containing Compounds Pyridine and its Derivatives Pyrazine Amines and Other Nitrogen‐containing Compounds Adsorption of Other Organic Compounds Alcohols Aminoacids Other Organic Acids Nucleic Bases and Other Biochemical Compounds Other Compounds Reconstruction of the Surface of Gold Electrodes Formation of Oxides on Gold Electrodes Underpotential Deposition of Various Metals on Au Cu Cd Pd S , Se , and Te Sulfur Selenium Tellurium Bi Pt Ni Co Sb Sn Al Tl Pb Zn Ge Rh Li Fe Ag Hg Electrochemistry of Coordination Compounds of Gold. Electrodissolution and Electrodeposition of Au Au Electrodeposition Au Electrodissolution Gold Clusters

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Miscibility of Adsorbed 1-Undecanethiol and 11-Mercaptoundecanoic Acid Species in Binary Self-Assembled Monolayers on Au(111)

Cited by 92 publications

References 82 publications

Voltammetry of immobilized cytochrome c on novel binary self-assembled monolayers of thioctic acid and thioctic amide modified gold electrodes

Voltammetry of immobilized cytochrome c on novel binary self-assembled monolayers of thioctic acid and thioctic amide modified gold electrodes

Effect of Intramonolayer Hydrogen Bonding of Carboxyl Groups in Self-assembled Monolayers on a Single Force with Phenylurea on an AFM Probe Tip

Electrochemistry of Gold*Dedicated to the memory of Professor Ralph N. Adams, a respected and unforgettable electrochemist and man

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