A New Approach for the Fabrication of Strongly Heterogeneous Mixed Self‐Assembled Monolayers

Ballav, Nirmalya; Weidner, Tobias; Rössler, Katrin; Lang, Heinrich; Zharnikov, Michael

doi:10.1002/cphc.200700120

Cited by 27 publications

(50 citation statements)

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“…10,11,24 When the difference in length of alkyl chain is more than four methylene groups, phase separation is observed. 22,[27][28][29] The X-ray photoelectron spectroscopy has, in the case of alkanethiol/ ferrocene alkanethiol mixed SAMs, allowed the differentiation of the binding energies of iron and sulfur, depending on whether the SAMs are prepared by coadsorption or successive adsorptions. In most cases, adsorption at lower temperature favors the coalescence of adsorbates.…”

Section: Introductionmentioning

confidence: 99%

Phase segregation on electroactive self-assembled monolayers: a numerical approach for describing lateral interactions between redox centers

Alévêque

Gautier

Dias

et al. 2010

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Phase segregation on electroactive self-assembled monolayers: a numerical approach for describing lateral interactions between redox centers

Alévêque

Gautier

Dias

et al. 2010

Phys. Chem. Chem. Phys.

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“…In this way, a place-exchange reaction can be promoted in which part of the molecules are replaced by another component to obtain a mixed film. 49,61,62 Another strategy to realize mixed SAMs is to attach both functional groups of interest to the same molecule. 55,63−66 Silien et al .…”

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confidence: 99%

The Electronic Structure of Mixed Self-Assembled Monolayers

et al. 2010

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The electronic structure of mixed self-assembled monolayers (SAMs) on Au(111) surfaces is modeled using slab-type density-functional theory calculations. The studied molecules have a dipolar character induced by polar and electron donating or accepting tail-group substituents. The resulting electronic structure of mixed layers is found to differ qualitatively from a simple superposition of those of the respective pure layers. Specifically, the positions of the frontier electronic states are shifted relative to the metal Fermi level, with the sign and magnitude of that shift depending on the dipole moment of the molecules and the mixing ratio in the film. This appears counterintuitive considering previous investigations, in which it has been shown that, for densely packed layers, tail-group substituents have no impact on the interfacial energy-level alignment. The seeming contradiction can be lifted by considering the local electrostatic interactions within the films in both mixed and homogeneous monolayers. Beyond that, we show that mixed SAMs provide an efficient tool for continuously tuning substrate work functions over a range that far exceeds that accessible by merely changing the coverage of homogeneous layers, with the net effect depending linearly on the mixing ratio in agreement with recent experimental findings.

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“…Herein we present a method to form gradients of bioresistance down to the micrometer scale using the irradiation‐promoted exchange reaction (IPER) and self‐assembled monolayers (SAMs) as the primary template 17–19. We and others have demonstrated in the past that SAMs of thiolates on gold can be affected by either X‐rays,20, 21 UV exposure,22, 23 or electron irradiation,18, 24–26 resulting in the appearance of conformational and orientational defects and bond cleavage.…”

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confidence: 99%