Competing Forces during Contact Formation between a Tip and a Single Molecule

Caffrey, Nuala M.; Buchmann, Kristof; Hauptmann, Nadine; Lazo, Cesar; Ferriani, P.; Heinze, Stefan; Berndt, Richard

doi:10.1021/acs.nanolett.5b01383

Cited by 10 publications

(16 citation statements)

References 46 publications

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“…The interaction potentials between the tip and the surface, which for Cu(100) are represented in Fig. 6(e), are also influenced by ∆ρ and can be measured by frequency shifts of an AFM [48]. In summary, we have shown that the interfacial charge density and its variation during sliding are the basic physical quantities, which determine adhesion, the PES, and thus the friction of a given atomically flat solid interface.…”

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confidence: 85%

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces

et al. 2018

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We derive a connection between the intrinsic tribological properties and the electronic properties of a solid interface. In particular, we show that the adhesion and frictional forces are dictated by the electronic charge redistribution occurring due to the relative displacements of the two surfaces in contact. We define a figure of merit to quantify such a charge redistribution and show that simple functional relations hold for a wide series of interactions including metallic, covalent, and physical bonds. This suggests unconventional ways of measuring friction by recording the evolution of the interfacial electronic charge during sliding. Finally, we explain that the key mechanism to reduce adhesive friction is to inhibit the charge flow at the interface and provide examples of this mechanism in common lubricant additives.

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confidence: 85%

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces

et al. 2018

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“…[14][15][16][17][18][19][20][21][22][23][24] As soon as electrostatic dipoles in the molecule or tip are present, the electrostatic force plays an important role in interpreting the images. 20,22,[24][25][26][27] Thiols are of great interest owing to their capacity to self-assemble and to create various structures thanks to their functionalizing groups. 28 The adsorption of thiols on Au(111) has been investigated over a range of coverages using a variety of methods including STM and X-ray diffraction.…”

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confidence: 99%

“…This transition occurs close to the maximal attractive force as observed for single atoms and other molecules before. 26,[51][52][53] The conductance at contact shift for three tip heights. While the shape in the current maps is similar for all distances probed, the frequency shift map evolves with decreasing tip-molecule distance.…”

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confidence: 99%

AFM Imaging of Mercaptobenzoic Acid on Au(110): Submolecular Contrast with Metal Tips

Hauptmann

Robles

Abufager

et al. 2016

J. Phys. Chem. Lett.

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A self-assembled monolayer of mercaptobenzoic acid (MBA) on Au(110) is investigated with scanning tunneling and atomic force microscopy (STM and AFM) and density functional calculations. High-resolution AFM images obtained with metallic tips show clear contrasts between oxygen atoms and phenyl moieties. The contrast above the oxygen atoms is due to attractive covalent interactions, which is different than previously reported high-resolution images, where Pauli repulsion dominated the image contrast. We show that the bonding of MBA to the substrate occurs mainly through dispersion interactions, whereas the thiol-Au bond contributes only a quarter of the adsorption energy. No indication of Au adatoms mediating the thiol-Au interaction was found in contrast to other thiol-bonded systems. However, MBA lifts the Au(110)-(2 × 1) reconstruction.

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“…For instance, the mechanical control of a single-molecule junction has been obtained by slowly approaching and retracting the tip thereby switching its magnetic and conductance properties 20–22 . Such methods are however of difficult integration in nanoscale devices.…”

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confidence: 99%

Designing a molecular magnetic button based on 4d and 5d transition-metal phthalocyanines

Ferriani

Heinze

Bellini

2017

Sci Rep

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The field of molecular spintronics exploits the properties of organic molecules possessing a magnetic moment, either native in the form of radicals or induced by the insertion of transition metal magnetic ions. To realize logic or storage molecular spin-tronics devices, molecules with stable different magnetic states should be deposited on a substrate, and switching between the states controllably achieved. By means of a first-principles calculations, we have devised a functional molecule exhibiting different magnetic states upon structural changes induced by current injection. We investigate the prototypical case of non-planar M-Phthalocyanine (MPc), where M is a transition-metal ion belonging to the 4d and 5d series. We find that for ZrPc and HfPc deposited on a graphene decorated Ni(111) substrate, two different structural conformations could be stabilized, for which the molecules attain different magnetic states depending on the position of the M ion – whether above the Pc or between the Pc and the substrate –, acting therefore as molecular magnetic button. Our work indicates an intuitive way to engineer a magnetic molecular switch with tailored properties, starting from the knowledge of the basic atomic properties of elements and surfaces.

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Competing Forces during Contact Formation between a Tip and a Single Molecule

Cited by 10 publications

References 46 publications

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces

AFM Imaging of Mercaptobenzoic Acid on Au(110): Submolecular Contrast with Metal Tips

Designing a molecular magnetic button based on 4d and 5d transition-metal phthalocyanines

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