Atomic structural change of silver-plating layers on the surfaces of Selemion, resulting in its excellent bending controllability
Atomic structural change of silver-plating layers on the surfaces of Selemion, resulting in its excellent bending controllability
复制标题
Selemion表面镀银层的原子结构变化，使其具有优异的弯曲可控性
DOI：
10.1016/j.snb.2005.07.043
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发表时间：
2006
影响因子：
8.4
通讯作者：
F. Nogata
中科院分区：
文献类型：
--
作者：
H. Tamagawa;F. Nogata
一种名为Selemion的离子交换聚合物膜在很大程度上脱水状态下含有-SO3H基团，其顶部和底部表面镀银，通过施加电压控制在相当长的时间内显示出良好的弯曲可控性，不同于传统研究得很好的水合离子交换聚合物膜，如Nafion。Selemion如此出色的弯曲可控性的确切机制尚未阐明。然而，银氧化还原反应参与了这种优异的弯曲可控性，这在以前就有过强烈的暗示。本研究中的X射线衍射测量清楚地表明发生了氧化还原反应，4Ag+O2=2Ag2O。通过对Selemion和Nafion的弯曲可控性测试和电流测量以及X射线衍射仪的测量，我们得出结论，氧化还原反应引起Selemion上下表面的Ag和Ag2O原子结构的变化是导致Selemion具有良好的弯曲可控性的原因。这种弯曲机制与传统的水合离子交换聚合物膜弯曲机制完全不同，后者即使在短时间内也不能表现出良好的弯曲可控性。
One of the ion-exchange polymer membranes called Selemion, containing –SO3H groups in the largely dehydrated state, where its top and bottom surfaces are plated with silver, exhibits an excellent bending controllability for fairly a long while by the applied voltage control unlike the conventionally well-investigated hydrated ion-exchange polymer membranes, such as Nafion. The exact mechanism of such an excellent bending controllability of Selemion has not been elucidated yet. However, the involvement of silver redox reaction in this excellent bending controllability was strongly suggested before. XRD measurement in this study clearly suggests the occurrence of redox reaction, 4Ag+O2=2Ag2O. By the bending controllability testing and the current measurements along with this XRD measurement on Selemion and Nafion, we reached the conclusion that the atomic structural change of Ag and Ag2O on the top and bottom surfaces of Selemion caused by the redox reaction is responsible for the excellent Selemion bending controllability. This bending mechanism is totally different from the conventionally accepted mechanism for the bending of hydrated ion-exchange polymer membranes, which cannot exhibit a good bending controllability even for a short while.