Potential and anion effects on the adsorption of 3',4'-bis(hexylthio)-2,2':5',2''-terthiophene on Au(111) electrode characterized by in situ STM

被引：2
|
作者：
Hsiao, Yu -Chun [1 ]
Velusamy, Arulmozhi [1 ]
Afraj, Shakil N. [1 ]
Liu, Jia-Hao [1 ]
Liu, Cheng-Liang [2 ]
Chen, Ming-Chou [1 ]
Kao, Hsien-Ming [1 ]
Yau, Shuehlin [1 ]
机构：
[1] Natl Cent Univ, Dept Chem, Taoyuan City 32049, Chungli County, Taiwan
[2] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei City 106319, Taiwan
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2023年 / 944卷
关键词：
In situ STM; Substituted terthiophene; Molecular adsorption; Anion coadsorption; Ordered Au(111) electrode; Oligothiophene; SCANNING-TUNNELING-MICROSCOPY; SELF-ASSEMBLED MONOLAYERS; SINGLE-CRYSTAL; CYCLIC VOLTAMMETRY; SMALL-MOLECULE; THIOPHENE; FIELD; ELECTROPOLYMERIZATION;
D O I：
10.1016/j.jelechem.2023.117646
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The adsorption of organic molecules on gold electrodes serves as a model to understand the organic/inorganic electrified interface, which is relevant to the study of molecular electronics and organic thin film semiconduc-tors. Our previous study on terthiophene (TT) adsorption on an Au(1 1 1) electrode shows that immersing Au (111) crystals in a TT ethanol dosing solution installs an ordered TT adlayer on the sample. The current study addresses the adsorption of 3',4'-bis(hexylthio)-2,2':5',2''-terthiophene (DTDST), a molecule with a TT back-bone attached with two thiolhexyl chains, on an ordered Au(1 1 1) electrode. High-quality STM images were obtained to reveal the internal and 2D spatial structures of DTDST admolecules. The potential greatly influ-enced the organization of DTDST on the ordered Au(1 1 1) electrode. Although the pristine DTDST adlayer was disordered, it transformed into ordered Au(1 1 1) -(3 & RADIC;3 x 9) and (5 & RADIC;3 x 26) structures after applying a potential more negative than 0 V (vs. Ag/AgCl) in 0.1 M H2SO4 and HClO4, respectively. Shifting the poten-tial more positive than 0.25 V resulted in coadsorption of bisulfate anions and restructuring of the DTDST adlayer. High-quality molecular resolution STM images were collected to reveal the azimuthal orientation of the DTDST admolecule on the Au(1 1 1) electrode. The thiolhexyl chains of DTDST admolecules could arrange in such a way that allowed intermolecular van der Waals interactions. Oxidation of adsorbed DTDST molecules to yield oligomers was also revealed by in situ STM.
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页数：11
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