Preparation and characterization of ordered Poly(3,4-Ethylenedioxythiophene) monolayers on Au(111) surfaces

单层 佩多:嘘 吸附 聚合 材料科学 聚(3,4-亚乙基二氧噻吩) 循环伏安法 化学工程 导电聚合物 介电谱 电化学 高分子化学 化学 电极 聚合物 纳米技术 有机化学 图层(电子) 物理化学 复合材料 工程类
作者
I-Ping Liu,Po-Hsuan Yeh,Sheng-Hsun Fu,Yuh‐Lang Lee
出处
期刊:Electrochimica Acta [Elsevier]
标识
DOI:10.1016/j.electacta.2019.134818
摘要

Abstract A novel method is developed to prepare orderly arranged mono-molecular layers of poly(3,4-ethylenedioxythiophene) (PEDOT) by surface polymerization of adsorbed 3,4-ethylenedioxythiophene (EDOT) monomers on Au(111) surfaces. To decrease the EDOT-substrate adhesion force, obtaining a highly ordered EDOT monolayer, the adsorption is performed in a phosphate buffer solution (PBS), rather than the acid solutions commonly utilized in the literature. Furthermore, potentials are applied on the electrode to regulate the adsorption rate of EDOT, and to simultaneously control the adsorption/polymerization mechanism of EDOT molecules. According to the observation of an in-situ electrochemical scanning tunneling microscopy (EC-STM), a highly ordered EDOT monolayer can be prepared by performing the adsorption in a PBS solution, as well as by slowly increasing the electrode potential, attributed to the slow adsorption of EDOT. In the following polymerization of the EDOT monolayer, if the reaction is performed at a constant potential (0.5 V vs. Ag/AgCl reference) or in an acid solution, the EDOT in the solution will take part in the reaction on the surface, leading to a disordered and multilayered structure of PEDOT film. Alternatively, by applying cyclic potentials between 0.0 and 0.5 V, as well as the utilization of a PBS solution, the polymerization could perform only on the pre-adsorbed EDOT monolayer, and an ordered PEDOT monolayer can be prepared. Impedance spectroscopy analysis indicates that the ordered PEDOT monolayer has a charge transfer resistance not only much lower than that of an EDOT monolayer, but also lower than that of the disordered PEDOT multilayer.
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