Structure of Self-Assembled Decanethiol on Ag(111): A Molecular Resolution Scanning Tunneling Microscopy Study

Dhirani, Al-Amin; Hines, Margaret A.; Fisher, A. J.; Ismail, O.; Guyot‐Sionnest, Philippe

doi:10.1021/la00007a046

Cited by 90 publications

(120 citation statements)

References 5 publications

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“…However, it is worth noting that both Ag(111) and Au(111) have virtually identical lattice constants. While SAMs on Au(111) form a commensurate v3 × v3 structure, it is now known that SAMs on Ag(111) are in fact incommensurate with the underlying silver lattice (12)(13)(14). The measured overlayer lattice constant is 4.4-4.8 Å, as compared to 5.0 Å on Au(111).…”

Section: The Structurementioning

confidence: 98%

The self-assembly of a layered material: metal-alkanethiolate bilayers

Bensebaa¹,

Ellis²,

Kruus³

et al. 1998

Rev. Can. Chim.

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/npsi/ctrl?action=rtdoc&an=8894811&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8894811&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1139/cjc-76-11-1654Canadian Journal of Chemistry, 76, 11, pp. 1654Chemistry, 76, 11, pp. -1659Chemistry, 76, 11, pp. , 1998 The self-assembly of a layered material: metal-alkanethiolate bilayers Bensebaa, Farid; Ellis, T. H.; Kruus, E.; Voicu, R.; Zhou, Y.The self-assembly of a layered material: metal-alkanethiolate bilayers F. Bensebaa, T.H. Ellis, E. Kruus, R. Voicu, and Y. Zhou Abstract: Layered materials composed of metal-alkanethiolate units have been synthesized and characterized. The selfassembly occurs at the interface between a metal-ion-containing aqueous phase and an alkanethiol-containing organic phase. Key features of the structure have been determined from X-ray diffraction and infrared spectroscopy measurements. The highly ordered bilayers are characterized by tilted, all-trans alkyl chains. A new model for the inplane structure has been presented, which is based on a hexagonal arrangement of metal atoms in the central plane.Key words: self-assembly, alkanethiolates, layered materials, vibrational spectroscopy.Résumé : On a synthétisé et caractérisé des matériaux en couches formés d'unités alcanethiolate de métal. L'autoassemblage se produit à l'interface entre une phase aqueuse contenant l'ion métallique et une phase organique contenant l'alcanethiol. On a déterminé les caractéristiques principales de la structure par diffraction des rayons X et par spectroscopie infrarouge. Les bicouches bien ordonnées sont caractérisées par des chaînes alkyles inclinées, complètement trans. On propose un nouveau modèle pour la structure dans le plan; elle est basée sur un arrangement hexagonal des atomes métalliques dans le plan central.Mots clés : autoassemblage, matériaux en couche, spectroscopie de vibration.

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Section: The Structurementioning

confidence: 98%

The self-assembly of a layered material: metal-alkanethiolate bilayers

Bensebaa¹,

Ellis²,

Kruus³

et al. 1998

Rev. Can. Chim.

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“…Specifically, an investigation of the n=18 alkylthiolate on Ag(111) using X-ray diffraction and low-energy (He) atom diffraction (LEAD) led to the conclusion that, for this species, an ordered phase having two rotational domains similar to that of the (77)R19.1º structure is formed, but the lateral periodicity is ~6% larger than this commensurate structure [36]. Subsequently, one STM study of decanethiolate (n=10) on Ag(111) [37] came to a similar conclusion, while most recently our own STM and LEED measurements on the pentylthiolate (n=5) layer also indicated an enlarged, incommensurate, surface unit mesh [38]. As a general rule, establishing whether the overlayer is commensurate or incommensurate by measuring nearest-neighbour interatomic distances in STM, or measuring the exact location of diffracted beams corresponding to the surface layer sub-mesh in a conventional diffraction technique (particularly using a standard LEED optics), can place significant demands on the precision of the measurement.…”

Section: Ag(111)mentioning

confidence: 99%

The interface structure of n-alkylthiolate self-assembled monolayers on coinage metal surfaces

Woodruff

2008

Phys. Chem. Chem. Phys.

124

150

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The current state of understanding of the structure of the metal/thiolate interface of nalkylthiolate 'self-assembled monolayers' (SAMs) on Cu(111), Ag(111) and Au (111) is reviewed. On Cu(111) and Ag (111) there is now clear evidence that adsorbate-induced reconstruction of the outermost metal layer occurs to a less atomically-dense structure, with the S head-group atom bonded to four-fold and three-fold coordinated hollow sites, respectively, and that intermolecular interaction plays some role in the periodicity of the resulting SAMs. On the far more heavily-studied Au(111) surface, the detailed interface structure remains controversial, but there is growing evidence for the role of Au-adatomthiolate moieties in the layer ordering.

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“…• structure [36,37]. Normal incident X-ray standing wave (NIXSW) experiments have confirmed the √ 7 × √ 7 structure, but have corrected the registry of the SAM on the underlying substrate to (…”

Section: Structuresmentioning

confidence: 99%

Dipole Formation at Interfaces of Alkanethiolate Self-assembled Monolayers and Ag(111)

2007

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The formation of interface dipoles in self-assembled monolayers (SAMs) of -CH3 and -CF3 terminated short-chain alkanethiolates on Ag(111) is studied by means of density functional theory calculations. The interface dipoles are characterized by monitoring the change in the surface work function upon adsorption of the SAM. We compare results obtained for SAMs in structures with a different packing density of molecules, i.e. (• , and p(2×2). The work function of alkanethiolate SAMs on silver depends weakly on the packing density; that of fluorinated alkanethiolates shows a stronger dependance. The results are analyzed in terms of two nearly independent contributions to the interface dipole. These originate respectively from the molecular dipoles and from a charge transfer between the metal surface and the molecules. The charge transfer is determined by the silver-sulfur bond and it is independent of the electronegativity of the molecules.

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Structure of Self-Assembled Decanethiol on Ag(111): A Molecular Resolution Scanning Tunneling Microscopy Study

Cited by 90 publications

References 5 publications

The self-assembly of a layered material: metal-alkanethiolate bilayers

The self-assembly of a layered material: metal-alkanethiolate bilayers

The interface structure of n-alkylthiolate self-assembled monolayers on coinage metal surfaces

Dipole Formation at Interfaces of Alkanethiolate Self-assembled Monolayers and Ag(111)

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