Onset of Crystalline Order in 1‐Nonanethiol Monolayers Deposited from Solution

Capitán, M. J.; Álvarez, Jesús Cuéllar; Calvente, Juan José; Andreu, Rafael

doi:10.1002/anie.200600926

Cited by 10 publications

(15 citation statements)

References 46 publications

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“…In contrast, the measurements shown in the present work were mostly performed on noncompact alkanethiol monolayers ͓Fig. 53 This leads us to conclude that the medium surrounding the sample plays a key role in the structural and mechanical properties of the alkanethiol monolayers. Regarding the presence of defects, it can be attributed to the surrounding liquid environment, as it was studied in the past by means of infrared techniques: It was concluded that terminal disorder in the alkyl chains was induced by the solvent, in that case of D 2 O, CD 3 OD, and CCl 4 .…”

Section: Folding Mechanismcontrasting

confidence: 57%

Mechanical properties of alkanethiol monolayers studied by force spectroscopy

Oncins

Vericat²,

Sanz³

2008

The Journal of Chemical Physics

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The mechanical properties of alkanethiol monolayers on Au(111) in KOH solution have been studied by force spectroscopy. The analysis of the vertical force versus penetration curves showed that monolayer penetration is a stepped process that combines elastic regions with sudden penetration events. The structural meaning of these events can be explained both by the creation of gauche defects on the hydrocarbon chains and by a cooperative molecular tilting model proposed by Barrena et al. [J. Chem. Phys. 113, 2413 (2000)]. The validity of these models for alkanethiol monolayers of different compactness and chain length has been discussed. The Young's modulus (E) of the monolayers has been calculated by using a recently developed model which considers the thickness of the monolayer as a parameter, thus allowing a decoupling of the mechanical properties of the thiol layer from those of the Au(111) substrate. As a result, the calculated E values are in the range of 50-150 Pa, which are remarkably lower than those previously reported in the literature.

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Section: Folding Mechanismcontrasting

confidence: 57%

Mechanical properties of alkanethiol monolayers studied by force spectroscopy

Oncins

Vericat²,

Sanz³

2008

The Journal of Chemical Physics

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“…Therefore, it is possible to have the S headgroups forming ordered lattices and yet have orientational and conformational disorder in the hydrocarbon chains. 237 Ordered alkanethiolates in SAMs tend to adopt a crystallinelike, all-trans configuration. This issue has been explored by using IR spectroscopy techniques, such as IRRAS and PMIRRAS.…”

Section: Chain Orderingmentioning

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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“…The characterisation of defects of self-assembled monolayers (SAMs) has therefore received considerable attention [10][11][12][13]. Numerous techniques were used for this purpose: scanning tunnelling microscopy (STM) [11,[14][15][16][17][18][19][20][21], infrared spectroscopy, voltammetry [3,6,22], electrochemical impedance spectroscopy (EIS) [3,[23][24][25][26][27][28], X-ray diffraction [29], contact angle measurements [7], scanning electrochemical microscopy (SECM) [30,31].…”

Section: Introductionmentioning

confidence: 99%