In situ Wilhelmy balance surface energy determination of poly(3-hexylthiophene) and poly(3,4-ethylenedioxythiophene) during electrochemical doping-dedoping.
In situ Wilhelmy balance surface energy determination of poly(3-hexylthiophene) and poly(3,4-ethylenedioxythiophene) during electrochemical doping-dedoping.
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DOI：
10.1021/la061606p
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发表时间：
2006-09
期刊：
影响因子：
--
通讯作者：
Xiangjun Wang;T. Ederth;O. Inganäs
中科院分区：
文献类型：
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作者：
Xiangjun Wang;T. Ederth;O. Inganäs
用Wilhelmy平板张力计在电化学池中原位测定了共轭聚合物表面聚(3-己基噻吩基)[P3HT]和聚(3，4-乙二氧基噻吩基)(PEDOT)在电解液中电化学掺杂-脱掺杂过程中接触角的变化。疏水的P3HT在氧化态的疏水性低于中性；亲水性较强的PEDOT在氧化态的亲水性低于中性。张力测量结果与接触角测量法的测量结果吻合较好，并进一步证实了另一种原位动态测定方法--两个平行聚合物涂覆板的流体室中掺杂时产生的毛细上升现象。接触角的变化取决于掺杂电势、电解液类型和浓度。我们还使用聚合物表面的三种探针液，将表面能反卷积为范德华和酸碱相互作用的分量，使电化学池异地运行。这些方法和结果对印刷电子学和电化学器件的科学技术领域以及对电化学掺杂表面能修饰的理解具有重要意义。
Changes in the contact angle between conjugated polymers surface poly(3-hexylthiophene) [P3HT] and poly(3,4-ethylenedioxythiophene) (PEDOT) upon electrochemical doping-dedoping in aqueous electrolyte were determined in situ using a Wilhelmy plate tensiometer in an electrochemical cell. The hydrophobic P3HT was less hydrophobic in the oxidized state than in the neutral state; the more hydrophilic PEDOT was less hydrophilic in the oxidized state than when neutral. The tensiometry results were in good agreement with those measured by contact angle goniometry, and further corroborated by the capillary rise upon doping in a fluid cell with two parallel polymer coated plates, another in situ dynamic determination method. The contact angle changes depend on doping potential, electrolyte type, and concentration. We also deconvoluted the surface energy into components of van der Waals and acid-base interactions, using three probe liquids on the polymer surfaces, ex situ the electrochemical cell. The methods and the obtained results are relevant for the science and technology areas of printed electronics and electrochemical devices and for the understanding of surface energy modification by electrochemical doping.