In situ friction study of Ag Underpotential deposition (UPD) on Au(111) in aqueous electrolyte

Park, Inhee; Baltruschat, Helmut

doi:10.1002/cphc.202100130

Cited by 3 publications

(8 citation statements)

References 41 publications

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“…This implies that the strength of the iodine adsorbed on Au(111) has no variation with potential in this potential region and it is a minor effect on friction. Moreover, a stepwise increase of friction upon increasing the normal load and upon the structural transition caused by penetration of the tip into either solvent layers or the adsorbate layer, as found in other cases, [2,4,6,58,69] was not observed. Therefore we assume that the adsorbed iodine is quite mobile, and no extra energy is dissipated to push it away in front of the sliding tip.…”

Section: Discussionmentioning

confidence: 71%

“…Although the classical friction law of Amontons predicts a linear relationship between friction and normal load, in electrochemical systems often a non‐linear behavior is observed [2,4,6] . On electrode surfaces, a sudden increase in friction or a plateau region had been ascribed to the penetration of the tip into an ionic layer.…”

Section: Resultsmentioning

confidence: 99%

“…Although the classical friction law of Amontons predicts a linear relationship between friction and normal load, in electrochemical systems often a non-linear behavior is observed. [2,4,6] On electrode surfaces, a sudden increase in friction or a plateau region had been ascribed to the penetration of the tip into an ionic layer. Also in ionic liquids, such a sudden, stepwise increase in friction was observed upon penetration of the tip through distinct electrolyte layers; there, penetration was confirmed by force distance curves.…”

Section: Dependence Of Friction On Normal Loadmentioning

confidence: 99%

“…Numerous studies of atomic scale friction employed atomic force microscopy or lateral force microscopy (AFM or LFM), [1][2][3][4][5][6][7][8][9][10][11][12] a technique that is also well suited to elucidate the lateral atomic structure. [13] As compared to the electrochemical scan-ning tunneling microscopy (EC-STM), [14,15] it has the disadvantage of a typically lower lateral resolution.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, apart from the importance of friction on wet surfaces (and thus electrodes), electrochemistry also offers means to control friction. [1][2][3][4][5][6][7][8][9][10][11][12] For SILs, Li et al demonstrated that friction as function of normal load correlates with the interaction between ions and the surface by varying potential. Furthermore, they observed that the behavior of friction with potential depends on substrate (HOPG and Au-(111)).…”

Section: Introductionmentioning

confidence: 99%

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Friction on I‐Modified Au(111) in a Tetraglyme Electrolyte

2022

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In situ electrochemical lateral force microscopy (EC-LFM) has been employed to study the ordered structure of Li + containing tetraglyme (G4) in front of I-modified Au(111) and its influence on friction as function of normal load. Since the effect of water in aprotic electrolytes is a critical issue, the influence of water on the ordered structure and friction was also been investigated. Lateral force maps recorded at low normal load (F N < 30 nN) show that the adsorbed iodine forms a ffi ffi ffi 3 p � ffi ffi ffi 3 p À � R30 � structure (q I ¼ 0:33Þ independent of potential. With increasing normal load, observed atomic corrugations at both potentials (0.45 V and À 0.4 V) are in agreement with the Au(111) (1 � 1Þ structure while returning to a ffi ffi ffi 3 p � ffi ffi ffi 3 p À � R30 � structure with decreasing normal load. Thus we conclude that the AFM tip penetrates into the iodine adlayer without irreversible wear. Astonishingly, no clear friction increase was observed upon penetration into the iodine adlayer; also no corresponding step was found in force separation (FS) curves. On the other hand, FS curves for I-modified Au(111) in pure G4 solvent and Li + containing electrolyte clearly showed several steps suggesting that G4 molecules are forming up to five ordered layers. It is noteworthy that we observed two different push-through forces for the innermost layers. Considering the higher reproducibility of FS curves on I-modified Au(111) compared to bare Au(111) we assume that the low surface energy of the iodine monolayer leads to negligible interaction between G4 molecules and iodine adlayer, resulting in less perturbations of the structure by the solid phase and also an increase of push-through force. Charts of friction forces vs. normal load are found to be independent of applied potential and the concentration of water.

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Section: Discussionmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Dependence Of Friction On Normal Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Friction on I‐Modified Au(111) in a Tetraglyme Electrolyte

2022

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The 3D structures of interfaces between solid electrodes and liquid electrolytes probed by atomic force measurements

Chen¹,

Rodenbücher²,

Korte³

2024

Encyclopedia of Solid-Liquid Interfaces

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Atomic-Scale Friction Study by EC-AFM: Underpotential Deposition (UPD) of Ag on I-Modified Au(111) and Its Tip Penetration

Park¹,

Baltruschat²

2022

J. Electrochem. Soc.

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The underpotential deposition (UPD) of Ag on an I-modified Au(111) surface is examined in perchloric acid solution by electrochemical lateral force microscopy (LFM). The transitions of ordered structures are observed as potential is swept and normal load changes. At low normal load, the structural changes with potential indicate that the iodine structure is very sensitive to the coverage of silver. At potentials positive of the 1st Ag UPD peak, the iodine forms a (√3×√3 R30°) structure (θ_I=0.33) on Au(111). The structural transition to a 1x1 structure observed as the normal load increases demonstrates that the AFM tip penetrates the iodine adlayer. As the potential passes the 1st Ag UPD peak, the iodine forms a p(3×3) (θ_I=0.44) structure and also silver seems to form a p(3×3) (θ_Ag=0.44) structure, as suggested by LFM images at high load. At even higher load, also this Ag layer is penetrated and the 1x1 structure of the substrate is observed. At potentials slightly negative of the 2nd Ag UPD peak, the atomic corrugations observed at high normal load indicate that silver completes a monolayer. At the 3rd Ag UPD peak where the Ag bilayer completes, the iodine forms a (√3×√3 R30°) (θ_I=0.33).

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In situ friction study of Ag Underpotential deposition (UPD) on Au(111) in aqueous electrolyte

Cited by 3 publications

References 41 publications

Friction on I‐Modified Au(111) in a Tetraglyme Electrolyte

Friction on I‐Modified Au(111) in a Tetraglyme Electrolyte

The 3D structures of interfaces between solid electrodes and liquid electrolytes probed by atomic force measurements

Atomic-Scale Friction Study by EC-AFM: Underpotential Deposition (UPD) of Ag on I-Modified Au(111) and Its Tip Penetration

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