Redox Properties of Polyvinylamine-g-TEMPO in Multilayer Films with Sodium Poly(styrenesulfonate).
Redox Properties of Polyvinylamine-g-TEMPO in Multilayer Films with Sodium Poly(styrenesulfonate).
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DOI：
10.1021/acsami.6b15319
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发表时间：
2017-02
影响因子：
9.5
通讯作者：
Q. Fu;Igor Zoudanov;Emil Gustafsson;Dong-Woon Yang;L. Soleymani;R. Pelton
中科院分区：
文献类型：
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作者：
Q. Fu;Igor Zoudanov;Emil Gustafsson;Dong-Woon Yang;L. Soleymani;R. Pelton
采用聚苯乙烯磺酸钠（PSS）修饰聚乙烯胺（PVAm-T），在金磺酸盐表面制备了层状组装体，并通过循环伏安法研究了其氧化还原性能. LB L组合物探测石英晶体微量天平（湿）和椭偏（干）膜测量。当总克里思覆盖率变化至6 μmol/m2时，通过改变PVAm-T中的克里思含量或通过改变LbL双层的数量，LbL组装体中约30%的克里思部分是氧化还原活性的。需要三个非氧化还原活性PVAm/PSS阻断双层以防止电极氧化外部LbL层中的PVAm-T。这表明LbL膜中的层之间存在显著的相互混合。除了对基于接枝克里思的氧化还原聚合物的小但不断增长的工作做出贡献之外，这项工作还可以作为在未来工作中理解胶体PVAm-T-漆酶复合物的氧化还原特性的参考点。
Layer-by-layer (LbL) assemblies of polyvinylamine with grafted TEMPO moieties (PVAm-T) with sodium polystyrenesulfonate (PSS) were prepared on gold-sulfonate surfaces, and the redox properties were measured by cyclic voltammetry. LbL compositions were probed by quartz crystal microbalance (wet) and ellipsometric (dry) film measurements. Approximately 30% of the TEMPO moieties in the LbL assemblies were redox-active when the total TEMPO coverage was varied up to 6 μmol/m2, by either varying the TEMPO content in PVAm-T or by varying the number of LbL bilayers. Three non-redox-active PVAm/PSS blocking bilayers were required to prevent the electrode from oxidizing PVAm-T in the exterior LbL layer. This suggests significant intermixing between the layers in the LbL film. In addition to contributing to the small but growing body of work on redox polymers based on grafted TEMPO, this work serves as a reference point for understanding the redox properties of colloidal PVAm-T-laccase complexes in future work.