模板法Li4Ti5O12纳米线阵列的制备及其机理分析

摘要

通过溶胶填充模板法制备了Li4Ti5O12纳米线阵列,采用SEM、EDS、XRD对纳米线形貌和组成进行了表征.实验结果表明:以孔径为100nm阳极氧化铝模板(AAO),于-0.1MPa负压环境中填充0.8 mol/L Li4Ti5O12溶胶,80℃干燥,900℃空气气氛中焙烧20h,重复填充-干燥-焙烧四次,得到平均直径为70nm尖晶石结构的Li4Ti5O12纳米线阵列.其直径和长度分别由模板的孔径、厚度,溶胶浓度和填充次数控制,晶体结构取决于焙烧时间和温度.并在实验基础上,分析了纳米线形成机理.%Li4Ti5O12 nanoarrays were prepared with sol-filling template method. The morphology and structure of Li4Ti5O12 nanoarrays were characterized by SEM, EDS and XRD. The experimental results show that spinel Li4Ti5O12 nanoarrays with average diameter of 70nm are obtained by repeating the following steps for four times:immersing the porous AAO in sol of 0.8mol/L under -0.1MPa and drying at 80℃, then roasting at 900℃ for 20h in the air. The diameter and length of Li4Ti5O12 nanoarrays are controlled by diameter, thickness, sol concentration and filling times, with the crystalline structure rested on the roasting time and temperature. On the basis of characterization for nanoarrays, a possible formation mechanism is supposed.