Lin Chia-Hsin, Gong Ya-Chen, Chen Hsuan-Yu, Wu Heng-Liang, Luo Shyh-Chyang
Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
Anal Chem. 2025 Jun 10;97(22):11402-11412. doi: 10.1021/acs.analchem.4c06327. Epub 2025 May 25.
Understanding water dynamics at material interfaces is crucial for applications in biotechnology, electrochemistry, and energy systems. In this study, we employed Fourier transform infrared spectroscopy and electrochemical quartz crystal microbalance with dissipation monitoring to investigate the hydration states and ion interactions of functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) films. By applying controlled potentials, we monitored ion absorption and desorption while using Gaussian fitting to analyze the O-H stretching bands. Our results revealed that sulfate ions (SO) compete with water molecules at PEDOT interfaces with hydroxyl groups, whereas perchlorate ions (ClO) exhibit minimal interference due to their weak water interactions. For PEDOT functionalized with zwitterionic phosphorylcholine groups, higher levels of intermediate water and nonfreezing water mitigated dehydration in saline environments. This work highlights the synergy between electrochemical and spectroscopic methods for real-time analysis of ion-water-polymer interactions, providing critical insights into interfacial phenomena regulated by applied potential.
了解材料界面的水动力学对于生物技术、电化学和能源系统中的应用至关重要。在本研究中，我们采用傅里叶变换红外光谱和带有耗散监测的电化学石英晶体微天平来研究功能化聚（3,4-亚乙基二氧噻吩）（PEDOT）薄膜的水合状态和离子相互作用。通过施加受控电位，我们监测离子的吸收和解吸，同时使用高斯拟合分析O-H伸缩带。我们的结果表明，硫酸根离子（SO）在具有羟基的PEDOT界面处与水分子竞争，而高氯酸根离子（ClO）由于其与水的相互作用较弱，干扰最小。对于用两性离子磷酰胆碱基团功能化的PEDOT，较高水平的中间水和非冻结水减轻了盐环境中的脱水现象。这项工作突出了电化学和光谱方法在实时分析离子-水-聚合物相互作用方面的协同作用，为受外加电位调节的界面现象提供了关键见解。
