有序介孔氧化硅SBA-15/纳米AgI复合材料制备及其物性研究  

PREPARATION AND STUDIES OF PHYSICAL PROPERTIES OF ORDERED MESOPOROUS SILICA SBA-15/Nano-AgI COMPOSITES

作　　者：游志成[1] 王玉霞[1] 高韶华[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,合肥230026

出　　处：《低温物理学报》2011年第1期20-24,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:50672095)资助的课题~~

摘　　要：AgI复合材料因其在电化学器件上的潜在应用而受到越来越多的关注.本文介绍采用浸渍热扩散的方法制备有序介孔氧化硅SBA-15/纳米AgI复合材料,对复合材料进行了XRD、TEM、SEM及交流阻抗谱分析表征.结果发现两相复合后AgI的离子电导率提高了约2个量级、相变温度也有较大改变.我们用界面空间电荷区模型解释了离子电导率的提高机理及用同质晶核间表面张力、弹性剪切力理论对相变温度的滞后机理给予了解析.AgI-based composites are attracting widespread interest for their potential applications in electrochemical devices.In this work,ordered mesoporous silica SBA-15/nano-AgI composites were prepared by dipping heat diffusion method.The composites were analysed and characterized by X-ray powder diffraction,transmission electron microscopy,scanning electron microscopy and ac impedance spectroscopy.The results suggest that the ionic conductivity of the composites is increased by two orders of magnitude and the phase-transition temperature changes a lot too.Interface space charge region model is adopted to explain the increase of the ionic conductivity and the effect of surface tension on homogeneous nucleation and elastic effect are adopted to explain the phase-transition lag,respectively.

关 键 词：纳米AgI 快离子半导体 有序介孔氧化硅SBA-15 离子电导率 

分 类 号：TB333[一般工业技术—材料科学与工程]