Sb₂O₃八面体微晶的合成及其湿敏性能研究

Synthesis and Humidity Sensing Performance of Sb₂O₃ Octahedral Microcrystals

摘要: 本工作采用简单的水热法合成了Sb₂O₃粉体并研究了其湿敏性能。材料表征显示，所制备的Sb₂O₃是立方相，呈现微米级八面体形貌，含有丰富的表面缺陷。将Sb₂O₃微晶作为敏感材料组装了阻抗型湿敏传感器，并对器件的湿敏特性展开评价。结果表明，Sb₂O₃在11%~97%的相对湿度范围内表现出优秀的湿敏性能，特别是灵敏度高(1.23 × 10⁵)，响应时间短(2 s)及最大湿滞小(1.5%)。最后，结合复阻抗谱与等效电路讨论了Sb₂O₃传感器的湿敏机理。本文报道了一种性能优异的感湿材料，进而为该类材料在生态及环境等方面的应用奠定了物质基础。

Abstract: In this work, Sb₂O₃ powder was synthesized by a simple hydrothermal method and its humidity sensing properties were investigated. The material characterization showed that as-prepared Sb₂O₃ was crystallized in a cubic phase, presenting a micron-sized octahedral morphology and containing abundant surface defects. Sb₂O₃ microcrystals were used as the sensitive layer to assemble an impedance-type humidity sensor, and then the humidity sensing characteristics of the device were evaluated. The results indicate that Sb₂O₃ exhibited excellent humidity sensing performance within a relative humidity range of 11%~97%, especially with high sensitivity (1.23 × 10⁵), short response time (2 s), and small maximum humidity hysteresis (1.5%). Finally, the humidity sensing mechanism of the Sb₂O₃ sensor was discussed by combining the complex impedance spectrum with the equivalent circuit. This work reports an excellent humidity-sensing material, and then laying a material foundation for its applications in ecology, environment and other aspects.