Kinetics of Exchange of Alkanethiol Monolayers Self-Assembled on Polycrystalline Gold

Baralia, Gabriel G.; Duwez, Anne‐Sophie; Nysten, Bernard; Jonas, Alain M.

doi:10.1021/la050245v

Cited by 82 publications

(89 citation statements)

References 51 publications

(77 reference statements)

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“…This results in a lower layer thickness and also in higher friction in the LFM, due to the increased number of available vibrational and relaxation modes under contact, which increases energy dissipation [24,25]. It is well known that high temperatures or even simple immersion in various solvents may lead to desorption of thiols [19,33]. Since the samples are flashed with hot dichloromethane to remove the PMMA mask after the first thiolization, this could be a first reason explaining the limited packing density of the thiol monolayer.…”

Section: Resultsmentioning

confidence: 99%

“…First, thiol molecules exchange in solution or in the gas phase [19], which implies the need to strictly control the conditions used during the deposition of the background thiol to avoid scrambling of the patterns (as was done here by working at 5…”

Section: Resultsmentioning

confidence: 99%

“…• C for 2 h only, in order to limit the exchange between thiol species as detailed elsewhere [18,19].…”

Section: Fabrication Of Nanopatterned Gold Surfacesmentioning

confidence: 99%

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Nanopatterned self-assembled monolayers

Baralia

Pallandre²,

Nysten

et al. 2006

Nanotechnology

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We report on the fabrication of chemically nanopatterned gold surfaces by combining electron-beam lithography with gas and liquid phase thiolization. The line-edge roughness of the patterns is ∼4 nm, corresponding to a limiting feature size in the range of 15 nm. Indications for a lower packing density of the self-assembled monolayers grown in the nanofeatures are given, and evidences for the bleeding of thiols along the grain boundaries of the gold substrate are displayed. A comparison is provided between nanopatterned thiol and silane monolayers on gold and on silicon wafers, respectively. The line-edge roughnesses are shown to be close to each other for these two systems, indicating that the limiting step is currently the lithography step, suggesting possible improvement of the resolution. The advantages and drawbacks of thiol versus silane monolayers are finally discussed with respect to the formation of chemically nanopatterned surfaces. M Supplementary data files are available from stacks.iop.org/Nano/17/1160

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nanopatterned self-assembled monolayers

Baralia

Pallandre²,

Nysten

et al. 2006

Nanotechnology

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“…16 Here, replacement of short alkane thiol by longer alkane thiols begins at grain boundaries and is followed by gradual replacement of entire domains, resulting in phase separated arrangement. 16,17 The replacement of shorter alkane thiols with longer alkane thiols in SAMs is thermodynamically favored due to the higher number of intermolecular van der Waals interactions formed with longer alkane thiol molecule. Uchida and co-workers studied the backfilling of high M W PEG layers with low M W PEG and assumed that the addition of low M W species results in formation of well-mixed, homogeneous mixed layers 14,15 The aspect of replacement and the extent of replacement are expected to be low since it is thermodynamically unfavorable for a longer PEG molecule to be replaced by a shorter PEG molecule.…”

Section: Introductionmentioning

confidence: 99%

Mixed poly (ethylene glycol) and oligo (ethylene glycol) layers on gold as nonfouling surfaces created by backfilling

et al. 2011

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Backfilling a self-assembled monolayer (SAM) of long poly (ethylene glycol) (PEG) with short PEG is a well-known strategy to improve its potential to resist fouling. Here it is shown, using xray photoelectron spectroscopy, contact angle, and atomic force microscopy, that backfilling PEG thiol with oligo (ethylene glycol) (OEG) terminated alkane thiol molecules results in underbrush formation. The authors also confirm the absence of phase separated arrangement, which is commonly observed with backfilling experiments involving SAMs of short chain alkane thiol with long chain alkane thiol. Furthermore, it was found that OEG addition caused less PEG desorption when compared to alkane thiol. The ability of surface to resist fouling was tested through serum adsorption and bacterial adhesion studies. The authors demonstrate that the mixed monolayer with PEG and OEG is better than PEG at resisting protein adsorption and bacterial adhesion, and conclude that backfilling PEG with OEG resulting in the underbrush formation enhances the ability of PEG to resist fouling.

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“…The adhesive force determined between the modified tip and the sample surface can be used to gain additional information about the chemical composition of the surface (Noy et al 1997). The tip is modified with self-assembling monolayers (SAMs) of alkane thiol compounds, which allow control of the functionality and their chemical and mechanical stabilities (Baralia et al 2005). Chemical force microscopy has been established on chemically modified, flat silicon surfaces by Noy et al (1995).…”

Section: Introductionmentioning

confidence: 99%

Determination of the cellulose and lignin content on wood fibre surfaces of eucalypts as a function of genotype and site

et al. 2010

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We compared the chemical composition of wood fibres and fibre surfaces of several eucalypt species and hybrids originating from various growth sites in South Africa. The objective was to test for differences in chemical surface composition due to genetics or site with the ultimate aim to facilitate a tailor-made supply of wood for pulping that results in an optimal blend of fibres that can be pulped together with similar yields. This, however, requires a sound knowledge of the fibre properties. The surface functionality on the single fibre level is a key property, because it determines how good inter-fibre bonding will be when paper is formed, which depends amongst other fibre properties on the amount of free hydroxyl groups that are available and therefore on the cellulose content on the fibre surface. The cellulose and lignin content on the fibre surface were determined with chemical force microscopy, a variation of atomic force microscopy. Since the general bulk composition of the fibre and the surface composition might differ, both parameters were determined. We found significant differences in the cellulose and lignin content on fibre surfaces, with regard to genotype and site, respectively. In some, but not all, cases, the surface composition of wood fibres followed the bulk composition, and differences were generally more pronounced. Differences due to genotype were significant, especially with regard to the surface lignin content-but variation due to site was also distinctly recognisable. This variation in surface functionality could be the reason why some pulpwood blends result in a lower pulp yield and different quality.

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Kinetics of Exchange of Alkanethiol Monolayers Self-Assembled on Polycrystalline Gold

Cited by 82 publications

References 51 publications

Nanopatterned self-assembled monolayers

Nanopatterned self-assembled monolayers

Mixed poly (ethylene glycol) and oligo (ethylene glycol) layers on gold as nonfouling surfaces created by backfilling

Determination of the cellulose and lignin content on wood fibre surfaces of eucalypts as a function of genotype and site

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