Studying the responses of potassium ion‐selective electrodes with poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate), PEDOT(PSS), as solid contact (SC) revealed significant differences in the equilibration times and standard potentials of the electrodes fabricated on Au or Pt as substrate electrodes. To trace the source of these differences, PEDOT(PSS) films were deposited under the same conditions onto Au and Pt electrodes on the surface of 10 MHz quartz crystals. During the galvanostatic polymerization, the frequency decrease of the quartz crystal was monitored by an electrochemical quartz crystal microbalance (EQCM). In the initial 15 seconds of the electrochemical deposition, the rate of PEDOT(PSS) polymer growth was significantly faster on Au compared to Pt although the current density used for the deposition was the same. Consequently, the total frequency change after a given electrolysis time was always larger on Au compared to Pt, indicating a larger deposited mass or PEDOT(PSS) layer thickness. The differences in the thicknesses of the PEDOT(PSS) films on Au and Pt could be quantitatively confirmed by X‐ray photoelectron spectroscopy (XPS) etching studies. Scanning electron microscopy (SEM) analysis of PEDOT(PSS) films on Au and Pt also showed characteristic differences.

中文翻译：

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在金和铂衬底电极上化学沉积的PEDOT（PSS）膜的差异：石英晶体微天平研究

以聚（3,4-亚乙基二氧噻吩）-聚（苯乙烯磺酸盐），PEDOT（PSS）作为固体接触（SC）来研究钾离子选择电极的响应时，发现在其上制造的电极的平衡时间和标准电势存在显着差异金或铂作为衬底电极。为了追踪这些差异的根源，在相同条件下将PEDOT（PSS）膜沉积在10 MHz石英晶体表面的Au和Pt电极上。在恒电流聚合期间，通过电化学石英晶体微量天平（EQCM）监测石英晶体的频率降低。在电化学沉积的最初15秒钟中，尽管用于沉积的电流密度相同，但与Pt相比，PEDOT（PSS）聚合物在Au上的生长速度明显更快。所以，在给定的电解时间之后，总频率变化在Au上总是比Pt大，表明沉积的质量或PEDOT（PSS）层的厚度更大。可以通过X射线光电子能谱（XPS）蚀刻研究定量地确认Au和Pt上PEDOT（PSS）膜厚度的差异。在金和铂上的PEDOT（PSS）膜的扫描电子显微镜（SEM）分析也显示出特征差异。