A New Phase of the c(4 × 2) Superstructure of Alkanethiols Grown by Vapor Phase Deposition on Gold

Lüssem, Björn; Müller‐Meskamp, Lars; Karthäuser, Silvia; Waser, Rainer

doi:10.1021/la0503552

Cited by 60 publications

(82 citation statements)

References 22 publications

(31 reference statements)

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“…o overlayer on Au(111) surfaces, which is further structured by a c(4×2) superstructure [16][17][18][19][20] that is readily observed by scanning tunneling microscopy (STM) with high-impedance tunneling junctions. 16,[21][22][23][24][25] Although many reports have described alkanethiol SAMs in the last 20 years, a full understanding of this system is far from complete, which is mostly due to the lack of understanding of imaging mechanism.…”

Section: Molecular Scale Images Reveal That Alkanethiol Sams Form a (mentioning

confidence: 99%

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Mamun¹,

Bae²,

Hahn³

2011

Bulletin of the Korean Chemical Society

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We investigated the effects of tunneling current on scanning tunneling microscopy (STM) images of 1-octanethiol (OT) and 1-decanethiol (DT) self-assembled monolayers (SAMs). At a low tunneling current, the domain boundaries and ordered alkanethiol molecules were clearly resolved. As the tunneling current was increased at a constant bias voltage, however, the STM images showed disordered structures of the OT and DT SAMs. As the tunneling current was reduced back to low values, the ordered structures of the alkanethiol molecules reappeared. The reversibility of the process suggests that the sulfur head groups did not rearrange under any of the tunneling current conditions. On the basis of our observations, which are inconsistent with the standard model for STM imaging of molecules on metal surfaces, we consider the STM imaging mechanism in terms of a two-region tunneling junction model.

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Section: Molecular Scale Images Reveal That Alkanethiol Sams Form a (mentioning

confidence: 99%

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Mamun¹,

Bae²,

Hahn³

2011

Bulletin of the Korean Chemical Society

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“…The STM images of (2√3x3)rect. show significant variations, leading to suggestions for dodecylthiolate (n=12), for example, that this unit mesh may be associated with as many as five distinctly different structures [42]. However, there is evidence that artefacts of the technique associated with tip and imaging conditions are the cause of these differences [43], and that the images all correspond to only one (2√3x3)rect.…”

Section: Overviewmentioning

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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“…By use of nanometersized electrodes it was shown that direct electron transfer through the layer, rather than electron transfer at the defects, was dominant and that the size of the defects was 1-100 nm [261]. Indeed, the present consensus is that SAMs are collectively organized in different phases constrained by disordered boundaries and substrate defects [251]. The approach of Abbou et al [74] is also notableby use of the combined AFM-SECM technique they probed the structure and dynamics of polymer chains labeled on one end with a ferrocene unit and grafted on the other end to a gold surface.…”

Section: Self Assembled Monolayersmentioning

confidence: 96%

“…It is now well established that the complete monolayers formed on Au(111) adopt a commensurate (√3×√3)R30°structure, which is further structured by a c(4×2) superlattice. The superstructure is characterized by systematic arrangement of molecules with distinct height differences in STM images [250,251]. The alkane chain is tilted at 30°to the surface normal.…”

Section: Self Assembled Monolayersmentioning

confidence: 99%

Multidimensional electrochemical imaging in materials science

2007

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In the past 20 years the characterization of electroactive surfaces and electrode reactions by scanning probe techniques has advanced significantly, benefiting from instrumental and methodological developments in the field. Electrochemical and electrical analysis instruments are attractive tools for identifying regions of different electrochemical properties and chemical reactivity and contribute to the advancement of molecular electronics. Besides their function as a surface analytical device, they have proved to be unique tools for local synthesis of polymers, metal depots, clusters, etc. This review will focus primarily on progress made by use of scanning electrochemical microscopy (SECM), conductive AFM (C-AFM), electrochemical scanning tunneling microscopy (EC-STM), and surface potential measurements, for example Kelvin probe force microscopy (KFM), for multidimensional imaging of potential-dependent processes on metals and electrified surfaces modified with polymers and self assembled monolayers.

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A New Phase of the c(4 × 2) Superstructure of Alkanethiols Grown by Vapor Phase Deposition on Gold

Cited by 60 publications

References 22 publications

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

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

Multidimensional electrochemical imaging in materials science

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