Nanoscale Electrochemical Surface Science on Molecular Assembly and Surface Function

YOSHIMOTO, Soichiro

doi:10.5796/electrochemistry.23-00067

Cited by 4 publications

(2 citation statements)

References 83 publications

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“…In addition to the intrinsic characteristics of FHC molecules, their spatial structures in fabricated films can influence the mobility of charge carriers and the photo efficiencies of solar cells. In situ scanning tunneling microscopy (STM) is a powerful tool to study molecular adsorption on a metal substrate. − FHC molecules including 3,4-ethylenedioxythiophene, , terthiophene (TT), thienothiophene (DTT), 2,3-diphenyl-5,7-di(thiophen-2-yl)thieno[3,4- b ]pyrazine (DPDTTP), 3′,4′-bis(hexylthio)-2,2′:5′,2″-terthiophene (DTDST) have been examined by STM …”

Section: Introductionmentioning

confidence: 99%

Scanning Tunneling Microscopy Examination of Molecules with Fused Thiophene and Pyrrole Groups Adsorbed on the Electrified Au(111) Interface

Balasaravanan,

Hsieh,

Jhou

et al. 2024

J. Phys. Chem. C

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Molecules with a fused pyrrole and thiophene backbone can be harnessed into organic semiconductors and optoelectronics devices. Closely related to these applications is contact with a frequently used gold electrode. This organic/metal interface has been examined with scanning tunneling microscopy (STM) at the molecular level, revealing the adsorption orientation and spatial structure of the Au(111) electrode. The current study focused on the adsorption of 1,4-bis(4H-dithieno[3,2-b:2′,3′-d]pyrrol-4-yl)benzene (BDTP) on an ordered Au(111) electrode. The BDTP adlayer was adsorbed onto a Au crystal by immersion in 0.01 mM BDTP/benzene dosing solution for 2 min after the Au electrode was pretreated with the annealing-and-quenching process. The STM experiment was performed in 0.1 M HClO 4 or H 2 SO 4 under potential control. The cyclic voltammetric results indicate that the BDTP adlayer was stable between −0.2 and 0.7 V (versus Ag/AgCl) in both acids before desorption and oxidation commenced at negative and positive potentials. High-quality STM imaging was achieved to provide insights into the interactions between BDTP admolecules and with the Au support. The van der Waals interaction between BDTP and Au(111) was strong enough to partially lift the Au(111)-(√3 × 22) reconstructed phase. The threedimensional adsorption configuration of the BDTP admolecule on the Au(111) electrode is inferred from the corrugated features in the STM image. Potential control affected the interfacial interactions, the coadsorption of anions, and finally the spatial molecular arrangement on the Au electrode.

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Section: Introductionmentioning

confidence: 99%

Scanning Tunneling Microscopy Examination of Molecules with Fused Thiophene and Pyrrole Groups Adsorbed on the Electrified Au(111) Interface

Balasaravanan,

Hsieh,

Jhou

et al. 2024

J. Phys. Chem. C

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“…Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) are powerful tools for understanding both 2D molecular assemblies and dynamics, such as assembly processes and molecular motions at the molecular scale. − To date, many reports and related reviews have been published on the characteristics of nanostructures and molecular assemblies of metal complexes, including metalloporphyrins, ,, metallophthalocyanines, ,,, 2D MOFs, ,− graphene nanoribbons (GNRs), , and supramolecularly assembled polymers such as catenanes on surfaces. Thus, the molecular architecture of functional molecules can be controlled not only in the gas phase but also in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Solvent Effect for the Structural Control of Molecular Architectures Consisting of Trinuclear Ruthenium Clusters and Ligands at the HOPG Surface

Inoue,

Abe,

Yoshimoto

2024

Langmuir

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The molecular architecture of a triruthenium complex and 1,4-di(4-pyridyl)benzene on highly oriented pyrolytic graphite was investigated by drop-casting mixed tetrahydrofuran and methanol solutions. Atomic force microscopy revealed the formation of one-dimensional molecular wires on highly oriented pyrolytic graphite after heating the mixed tetrahydrofuran solution, whereas large ring structures were formed in the methanolic solution. It was found that the molecular architectures composed of triruthenium complexes and 1,4-di(4-pyridyl)benzene strongly depend not only on the temperature of the solution but also on the organic solvents. The formation of the molecular architecture was supported by the ultraviolet−visible absorption spectra of the mixed solution and the electrochemical responses of the deposited film.

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Effects of Anion Coadsorption on the Self-Assembly of 11-Acryloylamino Undecanoic Acid on an Au(111) Electrode

Huang,

Chen,

Hsieh

et al. 2024

ACS Omega

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11-acryloylamino undecanoic acid (AAUA) is a versatile polymerizable surfactant that has been applied to coat medical devices, and these applications can benefit from a fundamental understanding of its interaction with a metal substrate. Cyclic voltammetry and in situ scanning tunneling microscopy (STM) were used to examine the adsorption configuration of AAUA molecules on an ordered Au(111) electrode and their mutual interactions, as AAUA was adsorbed from a methanol dosing solution. In addition to the van der Waals force between the aliphatic groups, the hydrogen bonding between the carboxylic acid and acrylamide groups was also important to guide the spatial arrangement of AAUA admolecules on the Au electrode. The −COOH group of AAUA admolecule likely dissociated in neutral media to −COO – , which formed hydrogen bonds with H 2 PO 4 – in phosphate buffer solution (PBS). This interaction between the AAUA admolecules and ions in the electrolyte resulted in different electrochemical characteristics observed in phosphate buffer solution (PBS) and potassium sulfate (K 2 SO 4 ). Molecular-resolution STM imaging revealed distinctly different AAUA spatial structures on the Au electrode in PBS and K 2 SO 4 . Shifting the potential positively to 0.5 V (versus Ag/AgCl) led to lifting of the reconstructed Au(111) to the (1 × 1) phase and the dissolution of the ordered AAUA film, suggesting that the orientation of the AAUA admolecule was altered. The ordered AAUA adlayer could be partially recovered by shifting the potential negatively.

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Nanoscale Electrochemical Surface Science on Molecular Assembly and Surface Function

Cited by 4 publications

References 83 publications

Scanning Tunneling Microscopy Examination of Molecules with Fused Thiophene and Pyrrole Groups Adsorbed on the Electrified Au(111) Interface

Scanning Tunneling Microscopy Examination of Molecules with Fused Thiophene and Pyrrole Groups Adsorbed on the Electrified Au(111) Interface

Solvent Effect for the Structural Control of Molecular Architectures Consisting of Trinuclear Ruthenium Clusters and Ligands at the HOPG Surface

Effects of Anion Coadsorption on the Self-Assembly of 11-Acryloylamino Undecanoic Acid on an Au(111) Electrode

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