Humidity sensing and dielectric properties of mesoporous Bi3.25La0.75Ti3O12 nanorods
Humidity sensing and dielectric properties of mesoporous Bi3.25La0.75Ti3O12 nanorods
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介孔Bi3.25La0.75Ti3O12纳米棒的湿度传感和介电性能
DOI：
10.1016/j.snb.2016.06.070
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Zheng Xuejun
中科院分区：
文献类型：
--
作者：
Zhang Yong;Jiang Bin;Yuan Mengjiao;Li Peiwen;Zheng Xuejun
采用静电纺丝技术制备了Bi3.25La0.75Ti3O12（BLT）纳米棒，并通过纳米浇铸法在BLT纳米棒中形成了介孔结构。采用X射线衍射、场发射扫描电子显微镜、透射电子显微镜和能谱仪对介孔BLT（M-BLT）纳米棒进行了表征，并将其与Ag-Pd叉指型电极一起涂覆在陶瓷基底上，形成湿敏器件。在室温下，在相对湿度（RH）为11- 95%的范围内，研究了M-BLT纳米棒湿敏器件的湿敏特性。M-BLT纳米棒的阻抗特性受频率的影响。M-BLT纳米棒在低频下具有良好的传感性能。该湿敏器件在100 Hz处具有高灵敏度，在11%~ 95%RH的湿度范围内阻抗变化超过6个数量级。M-BLT纳米棒湿敏器件的响应时间和恢复时间分别约为8 s和250 s，最大滞后约为4% RH。结果表明，静电纺丝技术与纳米浇铸法相结合是制备高性能湿敏材料的重要而有效的方法之一，M-BLT纳米棒是制备高灵敏度湿敏元件的理想材料。
Bi3.25La0.75Ti3O12(BLT) nanorods are synthesized via electrospinning technique, and mesoporous structures are formed in the BLT nanorods via nanocasting method. The mesoporous BLT (M-BLT) nanorods are characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometer, and then coated on the ceramic substrates with Ag-Pd interdigitated electrodes to form the humidity sensitive device. The humidity sensitive properties of M-BLT nanorods humidity sensitive device are investigated at room temperature within the relative humidity (RH) ranges of 11–95%. The impedance properties of M-BLT nanorods are effected by frequencies. The M-BLT nanorods have good sensing properties at low frequency. The humidity sensitive device is of high sensitivity at 100 Hz, and the impedance variations are over six orders of magnitude within the humidity ranges from 11% to 95% RH. The response time and recovery time of the M-BLT nanorods humidity sensitive device are about 8 s and 250 s, and the maximum hysteresis is about 4% RH. The results indicate that the electrospinning technique combining with nanocasting method would be one of important and effective approaches for preparing high-performance humidity-sensing material, and the M-BLT nanorods are the promising materials to fabricate high sensitivity humidity sensor.