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Enhanced ionic conductivity of AgI nanowires/AAO composites fabricated by a simple approach

机译：通过简单方法制造的AgI纳米线/ AAO复合材料的增强的离子电导率

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摘要

AgI nanowires/anodic aluminum oxide ( AgI NWs/AAO) composites have been fabricated by a simple approach, which involves the thermal melting of AgI powders on the surface of the AAO membrane, followed by the infiltration of the molten AgI inside the nanochannels. As-prepared AgI nanowires have corrugated outer surfaces and are polycrystalline according to scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. X-ray diffraction (XRD) shows that a considerable amount of 7H polytype AgI exists in the composites, which is supposed to arise from the interfacial interactions between the embedded AgI and the alumina. AC conductivity measurements for the AgI nanowires/AAO composites exhibit a notable conductivity enhancement by three orders of magnitude at room temperature compared with that of pristine bulk AgI. Furthermore, a large conductivity hysteresis and abnormal conductivity transitions were observed in the temperature-dependent conductivity measurements, from which an ionic conductivity as high as 8.0 x 10(2) Omega(-1) cm(-1) was obtained at around 70 degrees C upon cooling. The differential scanning calorimetry (DSC) result demonstrates a similar phase transition behavior as that found in the AC conductivity measurements. The enhanced ionic conductivity, as well as the abnormal phase transitions, can be explained in terms of the existence of the highly conducting 7H polytype AgI and the formation of well-defined conduction paths in the composites.
机译：AgI纳米线/阳极氧化铝（AgI NWs / AAO）复合材料是通过一种简单的方法制备的，该方法涉及将AgI粉末在AAO膜表面热熔，然后将熔融的AgI渗透到纳米通道内。根据扫描电子显微镜（SEM）和透射电子显微镜（TEM）的观察，制备的AgI纳米线具有波纹状的外表面，并且是多晶的。 X射线衍射（XRD）显示复合物中存在大量7H多型AgI，这可能是由于嵌入的AgI与氧化铝之间的界面相互作用引起的。 AgI纳米线/ AAO复合材料的交流电导率测量结果显示，与原始块状AgI相比，室温下电导率显着提高了三个数量级。此外，在取决于温度的电导率测量中观察到大的电导率滞后和异常的电导率转变，由此可在70度左右获得高达8.0 x 10（2）Omega（-1）cm（-1）的离子电导率。冷却时为C。差示扫描量热法（DSC）的结果表明，相变行为与交流电导率测量结果相似。可以通过高导电7H多型AgI的存在以及复合材料中明确定义的导电路径的形成来解释增强的离子电导率以及异常的相变。

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