Ion transport through a porphyrin-terminated hybrid bilayer membrane

Ion transport through a porphyrin-terminated hybrid bilayer membrane
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通过卟啉封端的杂化双层膜的离子传输

DOI:
10.1016/j.electacta.2010.10.040
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发表时间:
2011
影响因子:
6.6
通讯作者:
Fang, Yueping
Fang, Yueping
中科院分区:
材料科学2区
文献类型:
--
作者:
Li, Yongxin;Chen, Yuanli;Wang, Lun;Fang, Yueping

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在玻碳电极(GCE)上制备了混合双层膜(HBM)。 HBM 由共价连接在 GCE 上的正十六胺 (HDA) 内层和四(N-十六烷基吡啶基)卟啉 (TC16PyP) 外层组成。在循环伏安电位扫描下,HDA 通过其伯胺共价结合在碳表面上,形成自组装单层 (SAM)。由于疏水相互作用,TC16PyP 在 HDA 层顶部形成第二层。 TC16PyP/HDA/GCE 组件已用于研究通过混合双层膜的离子传输。人们发现,通过这种卟啉封端的 HBM 的离子传输强烈依赖于 pH 值。它允许带负电的氧化还原离子 Fe(CN)63− 在 pH <6 时渗透,同时排斥带正电的 Ru(NH3)63+。然而,在 pH > 6 时,这两种离子均未检测到法拉第电流。我们认为氧化还原离子和带电膜之间的静电相互作用是这种依赖于 pH 值的离子传输的主要原因。
A hybrid bilayer membrane (HBM) has been prepared on a glassy carbon electrode (GCE). The HBM consists of an inner layer of n-hexadecylamine (HDA) covalently attached at the GCE and an out-layer of tetra-(N-hexadecylpyridiniurnyl)porphyrin (TC16PyP). The HDA was covalently bounded on the carbon surfaces through its primary amine under cyclic voltammetric potential scans forming a self-assembled monolayer (SAM). The TC16PyP forms a second layer on top of the HDA layer due to hydrophobic interaction. The TC16PyP/HDA/GCE assembly has been utilized to study ion transport through hybrid bilayer membranes. The ion transport through this porphyrin-terminated HBM has been found to strongly dependent on pH. It allows negatively charged redox ions, Fe(CN)63−, to penetrate at pH <6 while repelling positively charged Ru(NH3)63+. However, no faradaic current has been detected at pH >6 with either ions. We believe that electrostatic interaction between the redox ions and the charged membrane is the main reason for this pH dependent ion transport.
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