Structure-Dependent Change of Desorption Species from <i>n</i>-Alkanethiol Monolayers Adsorbed on Au(111):  Desorption of Thiolate Radicals from Low-Density Structures

Kondoh, Hiroshi; Kodama, C.; Nozoye, Hisakazu

doi:10.1021/jp980175j

Cited by 56 publications

(74 citation statements)

References 18 publications

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“…Graphene regions show a different apparent height than 1AD islands and can thereby be segmented Scanning tunneling topographs before and after this second anneal, to 250 ˚C, are shown in Figure 5, where evidence of molecular desorption is obtained. 18,60,61 Once-filled holes are now empty and the hexagonal spacing of 5.0 ± 0.5 Å is recovered outside graphene pores. We confirm desorption by topographic imaging, where the exposed areas within the mask are destructively regenerated and thus prepared for further molecular deposition steps ( Figure S7).…”

Section: Resultsmentioning

confidence: 99%

Holey Graphene as a Weed Barrier for Molecules

et al. 2015

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We demonstrate the use of "holey" graphene as a mask against molecular adsorption. Prepared porous graphene is transferred onto a Au{111} substrate, annealed, and then exposed to dilute solutions of 1-adamantanethiol. In the pores of the graphene lattice, we find islands of organized, self-assembled molecules. The bare Au in the pores can be regenerated by postdeposition annealing, and new molecules can be self-assembled in the exposed Au region. Graphene can serve as a robust, patternable mask against the deposition of self-assembled monolayers.

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Section: Resultsmentioning

confidence: 99%

Holey Graphene as a Weed Barrier for Molecules

et al. 2015

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“…145,344,345 Disulfides have been proposed as the main final product of degradation in liquid media, and also in thermal desorption experiments (reaction 8). [354][355][356][357] In addition, sulfonate formation is expected after either air or liquid media exposure (reaction 9). 344,358 Therefore, in liquid media, the desorption rate increases because both degradation processes are possible.…”

Section: Chemical Stability: Sam Degradationmentioning

confidence: 99%

“…6). 354,355 However, Ito et al 350 have investigated the desorption process of structural isomers of propanethiols. For n-propanethiol SAM desorption they reported two peaks at 375 K and 450 K that were assigned to disulfide and thiolate desorption, respectively.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Self-assembled monolayers of thiols and dithiols on gold: new challenges for a well-known system

et al. 2010

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Self-assembled monolayers (SAMs) of alkanethiols and dialkanethiols on gold are key elements for building many systems and devices with applications in the wide field of nanotechnology. Despite the progress made in the knowledge of these fascinating two-dimensional molecular systems, there are still several "hot topics" that deserve special attention in order to understand and to control their physical and chemistry properties at the molecular level. This critical review focuses on some of these topics, including the nature of the molecule-gold interface, whose chemistry and structure remain elusive, the self-assembly process on planar and irregular surfaces, and on nanometre-sized objects, and the chemical reactivity and thermal stability of these systems in ambient and aqueous solutions, an issue which seriously limits their technological applications (375 references).

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“…4 The most studied and best understood system among ligands is the alkanethiol at Au(111) surfaces, which takes advantage of the environmental inertness of gold substrate, the high affinity of the sulfur-gold bonding, and the formation of ordered structure by the van der Waals forces between long carbon chains. [4][5][6] One example in the wide spectrum of its biological applications is a tailor surface with SAMs tethered with various functional head groups for manipulating the adhesion of proteins, cells, bacteria, and even large marine organisms. 7,8 Biocompatibility of biomaterials relies strongly on their surface properties.…”

Section: Introductionmentioning

confidence: 99%

Natural zwitterionic organosulfurs as surface ligands for antifouling and responsive properties

et al. 2014

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Natural sulfur-containing zwitterionic compounds, l-cysteine (Cys), l-methionine, and glutathionine (GSH), have been employed as surface ligands to prevent protein nonspecific adsorption on planar substrates. These organosulfur compounds form self-assembled monolayers (SAMs) on gold substrates by gold–sulfur interaction. The chemical elements of SAMs were confirmed using x-ray photoelectron spectroscopy. The surface wetting tests for SAMs show that films prepared from Cys and GSH exhibited super-hydrophilicity (contact angles of θ = ∼5°) due to their high coverage and strong hydration via ionic solvation and formation of hydrogen bonding. Quartz crystal microbalance with dissipation sensor was used to quantitatively and qualitatively monitor the adsorption of bovine serum albumin (BSA) from buffer onto these SAMs. It was found that the GSH film enables the resistance of BSA adsorption to the best extent at a physiological pH. Moreover, the surface charges of modified substrates were modulated by varying the pH value to control BSA adsorption. The effect of electrostatic repulsion on the antifouling behavior becomes prominent at a pH where the protein and the surface carry same charges. Consolidating the BSA adsorption measurements at different pH values, the antifouling properties of GSH-modified Au should be attributed to prevention of entropy gain and enthalpy loss, making BSA adsorption energetically unfavorable. It is believed that the surface modification with natural organosulfur ligands holds great potential in improving the biocompatibility of medical devices and in offering intelligent biointerfaces in response to environmental stimuli.

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Structure-Dependent Change of Desorption Species from n-Alkanethiol Monolayers Adsorbed on Au(111): Desorption of Thiolate Radicals from Low-Density Structures

Cited by 56 publications

References 18 publications

Holey Graphene as a Weed Barrier for Molecules

Holey Graphene as a Weed Barrier for Molecules

Self-assembled monolayers of thiols and dithiols on gold: new challenges for a well-known system

Natural zwitterionic organosulfurs as surface ligands for antifouling and responsive properties

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