Structure of Mixed Acid/Decyl Monolayers Grafted on Oxide-Free Si(111) Surfaces

Villeneuve, Catherine Henry de; Nguyen-Le, Thang Long; Ozanam, F.; Allongue, P.

doi:10.1021/acs.langmuir.8b03746

Cited by 4 publications

(5 citation statements)

References 36 publications

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“…In this case, the value of N T would simply be the average number of carbon atoms per molecule of the bulk mixture, assuming no phase segregation or deviation from linearity . Care must be taken when assuming random mixing as “prestructuring” of the solution, as has been recently shown for mixtures of alkenes of which one component was an alkene-terminated carboxylic acid . The formation of self-assembled reverse micelles by the carboxylic acid-containing alkene led to nonlinearity and phase segregation upon hydrosilylation on the Si(111)–H surface.…”

Section: Resultsmentioning

confidence: 99%

“…79 Care must be taken when assuming random mixing as "prestructuring" of the solution, as has been recently shown for mixtures of alkenes of which one component was an alkene-terminated carboxylic acid. 80 The formation of selfassembled reverse micelles by the carboxylic acid-containing alkene led to nonlinearity and phase segregation upon hydrosilylation on the Si(111)−H surface.…”

Section: Aumentioning

confidence: 99%

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Reconsidering X-ray Photoelectron Spectroscopy Quantification of Substitution Levels of Monolayers on Unoxidized Silicon Surfaces

Luber

Buriak

2020

J. Phys. Chem. C

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The covalent functionalization of unoxidized silicon surfaces is of interest for a wide range of applications, and for fundamental studies linking surface functionalization and electronic properties. Determination of the level of substitution (yield) of a reaction on a silicon surface is necessary as the number of functional groups bound to the surface is directly linked to properties. X-ray photoelectron spectroscopy (XPS), is the most common analytical method for determining the substitution level of the chemical handle on the silicon surface, typically a Si-H or Si-Cl bond, through which a new stable bond is formed to link the molecule to the surface. Calculations using the atomic ratio of carbon to silicon as determined by XPS do not take into account the effect of adventitious carbon, retained solvent and the substitution level is typically measured by first assuming 100% substitution of a fictitious hydrocarbon layer with an effective thickness that is determined by XPS intensity ratio of C to Si, and then the real substitution level is taken as the ratio of the effective thickness to the theoretical height of the molecule. In this work, we take an alternative and more physically meaningful approach to deriving expressions for the substitution level, where the photoelectron attenuation length is proportional to the substitution level. For all-hydrocarbon molecules grafted to a silicon surface, this new approach yields the same equations for substitution levels as an earlier effective thickness model. More importantly, unlike the effective thickness models, this method can be extended to include molecules with a heteroatom "tag", such as fluorine and chalcogenides, for determining coverage by XPS; this latter approach is shown to provide a greater degree of certainty with respect to calculating coverage on silicon. We finish with a simple flowchart to guide the reader to the appropriate equation for both Si(111) and Si(100) surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Aumentioning

confidence: 99%

Reconsidering X-ray Photoelectron Spectroscopy Quantification of Substitution Levels of Monolayers on Unoxidized Silicon Surfaces

Luber

Buriak

2020

J. Phys. Chem. C

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“…The etching procedure allows for obtaining H−Si(111) surfaces exhibiting extended (111) terraces flat at atomic scale well suited for high resolution AFM imaging [32] . The H−Si surfaces were then functionalized by covalent grafting of ω‐functionalized alkyl monolayer with carboxylic acid tail‐groups (Si−COOH surfaces) [23b,d] . Other surface chemistries were also considered.…”

Section: Methodsmentioning

confidence: 99%

Growth of Fe‐BDC Metal‐Organic Frameworks onto Functionalized Si (111) Surfaces

Yuan

Soulmi

et al. 2022

Chemistry An Asian Journal

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The realization of metal-organic framework (MOF) layers onto solid surfaces is a prerequisite for their integration into devices. This work reports the direct growth of Fe 3 + / benzene di-carboxylate MOFs onto functionalized silicon surfaces, compatible with a wide range of MOF synthesis conditions. The co-nucleation and growth of different crystalline phases are evidenced, whose coverage depends on the surface chemistry and/or the solution composition. Three structural phases -the cubic MIL-101(Fe), a hexagonal phase with a structure close to MOF-235 and a MIL-53(Fe) with a monoclinic symmetry -are identified through characteristic crystal shapes and their structural parameters inferred from X-Ray Diffraction. In addition to the oriented growth of 3D crystallites, the formation of two-dimensional MIL-101 nano-crystallites or thin layers/islands exhibiting extended monocrystalline domains with (111) texture is also demonstrated through high-resolution atomic force microscopy. Post-synthesis treatments reveal a weak adhesion of the hexagonal phase, indicating a different surface anchoring.

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“…A common reported procedure applied on oxide free silicon surfaces involves hydrosilylation with undecylenic acid to introduce the carboxylic acid functionality onto the silicon surface [ 80 ] followed by coupling to the amine group of a biomolecule via NHS/EDC chemistry. The method is one of the more reliable coupling strategies and is frequently applied for efficient bioconjugation on various substrates.…”

Section: Functional Surfaces For Efficient Bioconjugationmentioning

confidence: 99%

Functionalization of Oxide‐Free Silicon Surfaces for Biosensing Applications

Henriksson

Neubauer

Birkholz

2021

Adv Materials Inter

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As an alternative to standard silicon biofunctionalization protocol based on alkoxysilanes that bind to SiO2 on oxidized silicon substrates, several protocols to form bifunctional interlayers that directly bind to the silicon surface via a strong SiC bond have been developed during the last decades. These interlayers are more stable, and the lack of an insulating layer between the substrate and the interlayer reduces electric noise in biosensor devices. SiC monolayers are not yet regularly applied as the protocols are more complex and generally require an inert gas atmosphere. However, a variety of applications and new methods to form bifunctional SiC interlayers are recently developed. Here, the role these innovative protocols and interlayers play in biofunctionalization of silicon surfaces is reviewed and their applications in electrochemical, microelectromechanical, and optical biosensing are reported. From the analysis of the current situation, it can be concluded that the advantageous properties offered with this approach in many cases more than outweigh the additional processes to form SiC bonded interlayers and the approach is predicted to expand the applications of future silicon‐based biosensors.

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Structure of Mixed Acid/Decyl Monolayers Grafted on Oxide-Free Si(111) Surfaces

Cited by 4 publications

References 36 publications

Reconsidering X-ray Photoelectron Spectroscopy Quantification of Substitution Levels of Monolayers on Unoxidized Silicon Surfaces

Reconsidering X-ray Photoelectron Spectroscopy Quantification of Substitution Levels of Monolayers on Unoxidized Silicon Surfaces

Growth of Fe‐BDC Metal‐Organic Frameworks onto Functionalized Si (111) Surfaces

Functionalization of Oxide‐Free Silicon Surfaces for Biosensing Applications

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