In Situ Atomic Resolution Studies of the Electrode/Solution Interface by Electrochemical Scanning Tunneling Microscopy

2015 ◽  
pp. 695-748
Author(s):  
Scott Thorgaard ◽  
Philippe Bühlmann
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Solution Interface ◽  
Electrochemical Scanning Tunneling Microscopy

Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces

Nanoscale ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 3438-3443 ◽  
Author(s):  
Zhen-Feng Cai ◽  
Hui-Juan Yan ◽  
Dong Wang ◽  
Li-Jun Wan
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Scanning Tunneling ◽  
Liquid Interfaces ◽  
Tunneling Microscopy ◽  
Controlled Assembly ◽  
Electrochemical Scanning Tunneling Microscopy ◽  
Solid Liquid

We report the potential and concentration controlled assembly of an alkyl-substituted benzo[1,2-b:4,5-b′]dithiophene (DDBDT) on an Au(111) electrode byin situelectrochemical scanning tunneling microscopy (ECSTM).

scholarly journals In situ video-STM studies of the mechanisms and dynamics of electrochemical bismuth nanostructure formation on Au

2016 ◽  
Vol 193 ◽  
pp. 171-185 ◽  
Author(s):  
H. Matsushima ◽  
S.-W. Lin ◽  
S. Morin ◽  
O. M. Magnussen
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Temporal Resolution ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Deposit Morphology ◽  
Tunneling Microscopy ◽  
Atomic Arrangement ◽  
Surface Plane ◽  
Structural Fluctuations

The microscopic mechanisms of Bi electrodeposition on Au(111) and Au(100) electrodes in the overpotential regime were studied by in situ scanning tunneling microscopy with high spatial and temporal resolution. Atomic resolution images of the needle-like Bi(110) deposits formed on Au(111) reveal the central influence of covalent Bi–Bi bonds on the deposit morphology. In the straight steps along the needle edges the Bi atoms are interlinked by these bonds, whereas at the needle tip and at kinks along the needle edges dangling bonds exist, explaining the rapid structural fluctuations at these sites. For ultrathin Bi deposits on Au(100) a more open atomic arrangement was found within the surface plane, which was tentatively assigned to an epitaxially stabilised Bi(111) film. Furthermore, well-defined nanowires, consisting of zigzag chains of Bi surface atoms, were observed on this surface.

scholarly journals Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study

Surfaces ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 12-28 ◽  
Author(s):  
Tomasz Kosmala ◽  
Matías Blanco ◽  
Gaetano Granozzi ◽  
Klaus Wandelt
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Long Range ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Electrode Potentials ◽  
Electrochemical Scanning Tunneling Microscopy

The modelling of long-range ordered nanostructures is still a major issue for the scientific community. In this work, the self-assembly of redox-active tetra(N-methyl-4-pyridyl)-porphyrin cations (H2TMPyP) on an iodine-modified Au(100) electrode surface has been studied by means of Cyclic Voltammetry (CV) and in-situ Electrochemical Scanning Tunneling Microscopy (EC-STM) with submolecular resolution. While the CV measurements enable conclusions about the charge state of the organic species, in particular, the potentio-dynamic in situ STM results provide new insights into the self-assembly phenomena at the solid-liquid interface. In this work, we concentrate on the regime of positive electrode potentials in which the adsorbed molecules are not reduced yet. In this potential regime, the spontaneous adsorption of the H2TMPyP molecules on the anion precovered surface yields the formation of up to five different potential-dependent long-range ordered porphyrin phases. Potentio-dynamic STM measurements, as a function of the applied electrode potential, show that the existing ordered phases are the result of a combination of van der Waals and electrostatic interactions.

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