用于湿度传感的纳米晶多孔镍铁氧体陶瓷

D. Sekulić, Z. Lazarević, N. Romčević
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引用次数: 2

摘要

在过去的二十年中,合成具有高湿度敏感特性的新型陶瓷纳米材料以制造低成本、快速和稳定的湿度传感器引起了人们的极大兴趣。本文报道了采用软机械化学工艺成功合成的超细纳米粉末常规烧结制备的纳米晶多孔镍铁氧体陶瓷的湿度传感性能的初步结果。通过扫描电镜和x射线衍射分析,确定了制备的NiFe2O4陶瓷的结构特征(晶的平均尺寸、密度和孔隙率)。在室温下,该传感材料在相对湿度为15% ~ 85%的宽范围内,频率为2.5 kHz,阻抗变化呈线性响应。此外,该多孔陶瓷传感材料的响应时间(吸附过程)为26 s,恢复时间(解吸过程)为43 s。同时,具有相对较小的滞后,良好的重复性和稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nanocrystalline Porous Nickel Ferrite Ceramics for Humidity Sensing Applications
Over the last two decade, considerable interest has been received to synthesize novel ceramic nanomaterials with high humidity sensitivity characteristics for the fabrication of low-cost, fast and stable humidity sensors. This paper reports the preliminary results of humidity sensing properties of the nanocrystalline porous nickel ferrite ceramics fabricated by a conventional sintering of ultrafine nanopowders, which were successfully synthesized by soft mechanochemical processing. By using SEM and X-ray diffraction analyzes, the structural characteristics (average size of crystallites, density and porosity) of prepared NiFe2O4 ceramics were determined. At room temperature, this sensing material showed a linear response of impedance change within the wide relative humidity range from 15% to 85% at frequency of 2.5 kHz. Furthermore, the response time (adsorption process) of 26 s and the recovery time (desorption process) of 43 s have been obtained for this porous ceramic sensing material. Also, relatively small hysteresis, good repeatability and stability were also observed.
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