STM study of charge transfer and the role of rest-atoms in the binding of benzene to Si(111)7×7

Horn, Steven A.; Patitsas, S. N.

doi:10.1016/j.susc.2007.11.022

Cited by 14 publications

(15 citation statements)

References 46 publications

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“…The results presented in Table 1 suggest that the bridging geometry, that is well‐known from the study of other small aromatic molecules, is stable 12–16, 18–20, 27–29. For the thermodynamically preferred site, UE r , we find a binding energy of approximately 0.70 eV, a value that is comparable to our calculated binding energy for benzene on 7 × 7 (0.74 eV).…”

Section: Total Energy Calculationssupporting

confidence: 82%

Using steric constraints to template an organic array on Si(111)‐7 × 7

McLean

Weymouth

Edge

et al. 2012

Physica Status Solidi (a)

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We show that the Si(111)‐7 × 7 surface reconstruction can be used to template an ordered array of 1,3,5‐trimethyl benzene (mesitylene) molecules. The disorder that normally derives from the multiplicity of admissible adsorption geometries, for small aromatic molecules on 7 × 7, is suppressed, and the molecules are found to occupy both halves of the 7 × 7 unit cell with equal probability. It is argued that a steric interaction, associated with the methyl groups, hinders nearest neighbor adsorption and this leads to the formation of an array that has the molecules at the corners of the 7 × 7 half unit cells. To understand the ordering kinetics we used: scanning tunneling microscopy to study site occupancy as a function of coverage, ab initio total energy calculation to study the stability of the attachment sites and kinetic Monte Carlo modeling to investigate the emergence of translational order in the overlayer. When two mesitylene molecules adsorb in nearest neighbor bridging geometries on the 7 × 7 reconstruction, the hydrogen atoms located on the methyl groups interact. To reduce the interaction energy, the molecules form an ordered array that places each molecule at the corner of the half cell.

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Section: Total Energy Calculationssupporting

confidence: 82%

Using steric constraints to template an organic array on Si(111)‐7 × 7

McLean

Weymouth

Edge

et al. 2012

Physica Status Solidi (a)

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“…More recently, aromatic hydrocarbons, although smaller than coronene, have been studied on this surface. Benzene is known to adsorb preferentially on the FH [17,18] forming di−σ bonds to an adatom−rest atom pair [19,20,21]. The sticking probability at the center adatoms is twice that at the corner adatoms, since the latter have one adjacent rest atom while the former have two.…”

Section: Resultsmentioning

confidence: 99%

Selective adsorption of coronene on Si(111)-(7×7)

2010

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The adsorption of coronene (C 24 H 12 ) on the Si(111)-(7×7) surface is studied using Scanning Tunneling Microscopy (STM). Upon room temperature submonolayer deposition, we find that the coronene molecules preferentially adsorb on the unfaulted half of the 7×7 unit cell. Molecules adsorbed on different sites can be induced to move to the preferential sites by the action of the tip in repeated image scans. Imaging of the molecules is strongly bias dependent, and also critically depends on the adsorption site. We analyze the results in terms of differential bonding strength for the different adsorption sites and we identify those substrate atoms which participate in the bonding with the molecule.

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“…Similarly, quad-σ bonded products on two neighboring pairs of adjacent adatom-restatom sites were found for several aliphatic dienes, including 1,6-heptadiene, 1,7-octadiene and 1,13-tetradecadine . These [4+2] cycloaddition products have been observed for unsaturated hydrocarbon (1,3-butadine) at adatom–adatom pairs, and for aromatic hydrocarbons − and toluene, aromatic heterocycles (thiophene , ), and DNA base (thymine) at adjacent adatom-restatom pairs. These STM studies showed that the center adatom was more reactive with these organic molecules than the corner adatom.…”

Section: Introductionmentioning

confidence: 72%

Self-Organized Supported Clusters of l-Methionine

Rahsepar

Leung

2016

J. Phys. Chem. C

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Fundamental understanding of self-organization and integration of biomaterials on semiconductors is essential to the development of biological electronic devices. While formation of supramolecular structures by hydrogen bonding and/or electrostatic forces appears common on metal surfaces, the availability of dangling bonds on semiconductor surfaces introduces new bonding mechanisms that could disrupt the self-organization of basic biomolecules. Here, we demonstrate self-organization of l-methionine on Si(111)7×7 at room temperature into a Y-shaped trimer, as the first “perfect-match” supported cluster reported to date. The Y trimer is found to be securely attached within the 7×7 half unit cell and is driven by intralayer hydrogen bonding among the unattached carboxylic acid groups in a ring configuration. Its unique cluster structure is verified by ultra-large-scale density functional theory calculations with van der Waals corrections. The Y trimer (key) offers a remarkably stable “lock-and-key” fit to the 7×7 unit cell (lock) for biofunctionalization and molecular templating.

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STM study of charge transfer and the role of rest-atoms in the binding of benzene to Si(111)7×7

Cited by 14 publications

References 46 publications

Using steric constraints to template an organic array on Si(111)‐7 × 7

Using steric constraints to template an organic array on Si(111)‐7 × 7

Selective adsorption of coronene on Si(111)-(7×7)

Self-Organized Supported Clusters of l-Methionine

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