Chip-Scale Electrodeposition and Analysis of Poly(3,4-ethylenedioxythiophene) (PEDOT) Films for Enhanced and Sustained Microfluidics Using DC-Redox-Magnetohydrodynamics
Chip-Scale Electrodeposition and Analysis of Poly(3,4-ethylenedioxythiophene) (PEDOT) Films for Enhanced and Sustained Microfluidics Using DC-Redox-Magnetohydrodynamics
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DOI：
10.1149/2.0811913jes
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发表时间：
2019
影响因子：
3.9
通讯作者：
Foysal Z. Khan;I. Fritsch
中科院分区：
文献类型：
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作者：
Foysal Z. Khan;I. Fritsch
氧化还原-磁流体动力学（R-MHD）微流体通过电极和磁场的策略性放置/激活精确地操纵流体流动。本文评价了在基于芯片的金电极上电沉积聚（3,4 -乙烯二氧噻吩）（PEDOT）薄膜的各种条件，以获得最大电流和电荷密度，它们分别与R-MHD在单一方向上的泵送速度和持续时间直接相关。采用循环伏安法（CV）（5、50和100 mV/s）在碳酸丙烯酯（PC）溶液和tbapf6或liclo4电解质中电沉积PEDOT。最大电荷与循环次数成正比，与扫描速率（即氧化单体的时间）成反比。与PC: liclo4相比，PC: tbapf6形成的薄膜更厚、更粗糙。CV、时间电流法（CA）、时间电位法和阻抗谱法评估了膜在水溶液中的电化学性能。在给定的水溶液中，PEDOT膜在CA过程中的最大电流与电沉积参数和厚度无关，并随离子强度线性增加。一个三阶段模型描述了厚PEDOT膜的氧化反应。在780 μm深的磷酸盐缓冲盐水中，当温度为0.37 T时，经最厚膜修饰的平行带电极间的R-MHD流体速度和泵送时间分别为50 μm/s和210 μ s，以及820 μm/s和800 μA时的9 s。
Redox-magnetohydrodynamics (R-MHD) microfluidics precisely manipulates fluid flow through strategic placement/activation of electrodes and magnetic fields. This paper evaluates various conditions of potentiodynamic electrodeposition of poly (3, 4-ethylenedioxythiophene)(PEDOT) films on chip-based, gold electrodes to attain maximum current and charge density, which correlate directly to R-MHD pumping speed and duration in a single direction, respectively. Electrodeposition of PEDOT was controlled by cyclic voltammetry (CV)(5, 50, and 100 mV/s) in propylene carbonate (PC) solutions of monomer and TBAPF 6 or LiClO 4 electrolyte. The maximum charge is directly proportional to cycle number and inversely proportional to scan rate (ie time spent oxidizing monomer). Thicker and rougher films formed from PC: TBAPF 6, compared to PC: LiClO 4. CV, chronoamperometry (CA), chronopotentiometry, and impedance spectroscopy assessed the electrochemical performance of films in aqueous electrolytes. The maximum current during CA in a given aqueous electrolyte for PEDOT films was independent of electrodeposition parameters and thickness and increased linearly with ionic strength. A three-stage model describes the oxidative response of thick PEDOT films. R-MHD fluid speeds and pumping durations at 0.37 T in 780-μm-deep phosphate-buffered saline were 50 μm/s and 210 s at 50 μA and 820 μm/s and 9 s at 800 μA, respectively, between parallel-band-electrodes, modified with the thickest films.