UPS, XPS, and NEXAFS Study of Self-Assembly of Standing 1,4-Benzenedimethanethiol SAMs on Gold

Pasquali, Luca; Terzi, Fabio; Seeber, Renato; Nannarone, Stefano; Datta, Debasish; Dablemont, Céline; Hamoudi, Hicham; Canepa, M.; Esaulov, Vladimir A.

doi:10.1021/la105063u

Cited by 64 publications

(117 citation statements)

References 59 publications

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“…The direct assembly study was extended to BDMT and BPD molecules. Formation of BDMT SAMs from ethanol produced erratic results in RAIRS and SE measurements. There appeared to be lying down and standing‐up molecules and multilayer formation.…”

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

“…(a) S 2p XPS spectra of BDMT SAMs assembled in an n‐hexane solution for hn = 260eV. (b) C1s NEXAFS spectra taken at different angles between the surface plane and the electric field vector for BDMT.…”

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

“…There appeared to be lying down and standing‐up molecules and multilayer formation. A robust and reproducible protocol for well ordered SAM preparation was found for a 60°C degassed n‐hexane solution in absence of light. This heating procedure originates from the observation for thiols, that mild annealing to this temperature in the preparation solution during assembly yields larger ordered domains.…”

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

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Selfassembly of α,ω‐dithiols on surfaces and metal dithiol heterostructures

Hamoudi

Esaulov

2016

Annalen der Physik

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α,ω-Dithiols present an interesting case of molecules with two reactive terminal -SH groups (HS-R-SH) that allow their use as binders between different metallic entities. They have thus been used in molecular electronics conduction measurements, in "nanogap" electrodes of interest in plasmonics, as building blocks of more complex structures such as metal intercalated superlattices and in the formation of metalized organic thin films, including doped graphene type films. There exist however many problems, because the molecules may end up in undesirable configurations with both thiol terminals bound to the same metal particle/substrate or link with other molecules to produce "multi-molecule" or "multilayer" structures. This report discusses various key questions on dithiol linking with metal surfaces and the quest of protocols of making problem free dithiol metal structures. It then describes the use of dithiols and their SAMs to produce various metal organic heterostructures useful for molecular electronics and formation of doped metalized organic thin films. We discuss the build up of these structures by self assembly and lithography, their chemical composition and functional properties.

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Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

Section: Dithiol Self Assembled Monolayersmentioning

confidence: 99%

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Selfassembly of α,ω‐dithiols on surfaces and metal dithiol heterostructures

Hamoudi

Esaulov

2016

Annalen der Physik

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“…We recall that the S Au component appears with a lower intensity, because of attenuation of intensity of electrons passing through the organic layer. 23,24 Because the BPD molecules are longer they result in a greater attenuation of electrons passing through the thicker layer and the S Au intensity is lower than for BDMT. We shall return to this point later.…”

Section: Xps Measurementsmentioning

confidence: 99%

“…[52][53][54] Here we ask ourselves the question whether it is indeed possible to build a multilayer SAM starting from the highly quality dithiol SAM? We base ourselves on the results of these earlier works, 23,24,50 and have used a combination of SE, and XPS to study the formation of the bilayer of BDMT and also 5,5 0 -bis(mercaptomethyl)-2,2 0 -bipyridine (BPD) self-assembled lms on Au, with intercalated Ag atoms. In the following we refer to these generically as DT (dithiols).…”

Section: Introductionmentioning

confidence: 99%

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

et al. 2014

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A study of the self-assembly of silver atom intercalated 5,5 0 -bis(mercaptomethyl)-2,2 0 -bipyridine (BPD; HS-CH 2 -(C 5 H 3 N) 2 -CH 2 -SH) and 1,4-benzenedimethanethiol (BDMT; HS-CH 2 -(C 6 H 4 )-CH 2 -SH)) dithiol (DT) multilayers on gold is presented. The bilayer of these SAMs can be obtained starting from the exposure of a DT monolayer to a concentrated silver ion solution. After grafting the silver atoms on the sulfur end group, the incubation of the resulting DT-Ag SAM in a DT solution leads to the formation of a DT-Ag-DT bilayer. This process was extended to make a multilayer structure. The corresponding changes in these self-assembled layers on Au are characterized by X-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE) measurements, and I-V characteristics. Our interpretation of evolution in the absorbed layer are based on changes in intensities of peaks in XPS related to S bound to substrate or Ag and in -SH groups, as well as changes in thickness and absorption features in SE measurements. The latter show the evolution in absorbance wavelength as a function of thickness and indicate a decrease in the HOMO-LUMO gap from about 4.5 eV to 4 eV. The I-V characteristics show a significant bias dependence on the number of the BPD layers and there appears to be a transition from tunneling to a hopping regime when going from the single to the multiple layers.

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DNA Immobilization

Wittmann

Marquette

2012

Encyclopedia of Analytical Chemistry

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Immobilized DNA is required for the development of DNA chips and arrays, DNA sensors, or other sensing devices including microfluidics, in addition to gene delivery devices. The broad application range for all of these DNA‐based systems is to a major extent found in the medical area, using the devices also in DNA sequencing and furthermore for food and environmental analyses. Therefore, strategies for DNA immobilization are described in this article, with focus on immobilization chemistry. Depending on the different surfaces, various immobilization techniques (e.g. via physical adsorption, covalent, affinity binding, and matrix entrapment) were developed and optimized, which are described for carbonaceous materials (e.g. carbon nanotubes), silica and silicon surfaces, gold surfaces, the same as for more recently complex biocompatible surfaces (e.g. polymeric gels). The ‘top‐down techniques’ can be distinguished from the ‘bottom‐up’ techniques started in the very beginning of DNA chip development. More recently, surfaces such as stents or biocompatible transplants are on focus to generate therapeutic devices. In the future, the power of DNA as a self‐assembling material could be used to combine both the ‘bottom‐up’ and ‘top‐down’ strategies to generate complex nanostructures with multifunctional applications (e.g. three‐dimensional DNA ‘origami’). Overall, the main aim of this article is to provide an overview of the methods currently used for DNA immobilization regarding the broad variety of the above mentioned potential applications.

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UPS, XPS, and NEXAFS Study of Self-Assembly of Standing 1,4-Benzenedimethanethiol SAMs on Gold

Cited by 64 publications

References 59 publications

Selfassembly of α,ω‐dithiols on surfaces and metal dithiol heterostructures

Selfassembly of α,ω‐dithiols on surfaces and metal dithiol heterostructures

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

DNA Immobilization

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