Spatially Directed Functionalization by Co-electropolymerization of Two 3,4-ethylenedioxythiophene Derivatives on Microelectrodes within an Array
Spatially Directed Functionalization by Co-electropolymerization of Two 3,4-ethylenedioxythiophene Derivatives on Microelectrodes within an Array
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DOI：
10.1149/1945-7111/abcb75
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发表时间：
2020-12
影响因子：
3.9
通讯作者：
B. Jones;C. Korzeniewski;J. H. Franco;S. Minteer;I. Fritsch
中科院分区：
文献类型：
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作者：
B. Jones;C. Korzeniewski;J. H. Franco;S. Minteer;I. Fritsch
电沉积的导电共聚物薄膜具有可预测的相对特性（用于进一步修饰的官能团数量和电容），在传感器、有机电子材料和能源应用中具有重要意义。研究了两种噻吩衍生物（2,3 -二氢噻吩[3,4 -b]二恶英-2-基）甲醇(1)和4-（（2,3 -二氢噻吩[3,4 -b][1,4]二恶英-2-基）-甲氧基）-4-氧丁酸(2)在含0.02 M总单体（0,25,34,50,66,75,100 mol% 2）、0.05 M十二烷基硫酸钠和0.1 M liclo4的水溶液中在金微电极阵列上的电位动力学共聚。减少单体沉积(m)从0到100 mol% 2归因于降低pH抑制电聚合。通过微衰减全反射傅里叶变换红外光谱和x射线光电子能谱测定，薄膜中1和2的摩尔比与沉积溶液中的摩尔比密切相关。用循环伏安法测得的电容量和亚铁氰化物在膜上的电子转移不受共聚物组成的影响，除了100 mol% 2的情况。正反法拉第峰电流的比值表明，高含量1的薄膜以阳极形式膨胀，以阴极形式收缩，而高含量2的薄膜则相反，其中阴离子和阳离子分别主导着溶液中的反离子传输。
Electrodeposited conductive copolymer films with predictable relative properties (quantities of functional groups for further modification and capacitance) are of interest in sensors, organic electronic materials and energy applications. Potentiodynamic copolymerization of films in aqueous solutions of two different thiophene derivatives,(2, 3-dihydrothieno [3, 4-b] dioxin-2-yl) methanol (1) and 4-((2, 3-dihydrothieno [3, 4-b][1, 4] dioxin-2-yl)-methoxy)-4-oxobutanoic acid (2), containing 0.02 M total monomer (0, 25, 34, 50, 66, 75, 100 mol% 2), 0.05 M sodium dodecyl sulfate, and 0.1 M LiClO 4, on gold microelectrodes in an array was investigated. Decreasing monomer deposited (m) from 0 to 100 mol% 2 is attributed to a decreasing pH that inhibits electropolymerization. Molar ratios of 1 and 2 in the films, determined by micro-attenuated total reflectance Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, tracks closely with the ratio in the deposition solutions. Capacitances measured from cyclic voltammetry in aqueous buffer and electron transfer of ferrocyanide at the films are unaffected by copolymer composition, except for the 100 mol% 2 case. Ratios of reverse-to-forward faradaic peak currents suggest that films with high content of 1 expand in the anodic form and contract in the cathodic form and vice versa for films with high content of 2, where anions and cations dominate counterion transport from solution, respectively.