Electrochemical and surface characterisation of poly(3,4-ethylenedioxythiophene) dodecylbenzenesulfonate layers

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Bulletin Pub Date : 2024-08-15 DOI:10.1016/j.materresbull.2024.113050

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Abstract

Poly(3,4-ethylenedioxythiophene) (PEDOT) films were electrochemically synthesised with sodium dodecylbenzenesulfonate (DBS) and chloride acting as dopant anions within the polymer matrix. Upon redox switching of the PEDOT/DBS film between conducting and non-conducting states, the DBS anion remained within the polymer and cation insertion and expulsion occurred, as confirmed by Electrochemical Quartz Crystal Microbalance (EQCM) measurements. Electrolytes composed of alkali metal cations of varying masses (Li⁺, Na⁺, K⁺) were employed to investigate the cation insertion/expulsion processes, thereby resulting in varying mass changes being observed upon film redox switching. The charging and discharging of bulky anion doped polymer films presented higher capacitance upon charging and lower capacitance when discharging, which is expected during doping and de-doping as confirmed by AC impedance. In this work, the main results obtained by chemical-physical characterisation are presented and critically discussed, with regard to the possible use of a viable conducting polymer as a drug delivery vehicle.

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聚(3,4-亚乙二氧基噻吩)十二烷基苯磺酸盐层的电化学和表面特性分析

聚（3,4-亚乙二氧基噻吩）（PEDOT）薄膜是以十二烷基苯磺酸钠（DBS）和氯化物作为聚合物基质中的掺杂阴离子进行电化学合成的。电化学石英晶体微天平（EQCM）测量证实，当 PEDOT/DBS 薄膜在导电和不导电状态之间发生氧化还原转换时，DBS 阴离子仍留在聚合物中，阳离子则会插入或排出。为了研究阳离子的插入/排出过程，我们使用了由不同质量的碱金属阳离子（Li+、Na+、K+）组成的电解质，因此在薄膜氧化还原切换时观察到了不同的质量变化。掺杂了大量阴离子的聚合物薄膜在充电和放电时电容较高，而在放电时电容较低，这在掺杂和去掺杂过程中是预料之中的，交流阻抗也证实了这一点。在这项工作中，我们介绍了通过化学物理特性分析获得的主要结果，并就可行的导电聚合物作为药物输送载体的可能性进行了深入讨论。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.