高响应NaTaO₃/SnO₂湿度传感器的制备及性能研究

Study on the Preparation and Performance of NaTaO₃/SnO₂ Humidity Sensor with High Response

本文采用水热法制备NaTaO3/SnO2纳米材料,系统地研究了其湿度传感性能。实验结果表明,NaTaO3/SnO2复合材料比表面积比纯NaTaO3更大,这使得复合材料表面吸附更多的水分子,增强了NaTaO3/SnO2湿度传感器的性能。NaTaO3/SnO2复合材料表面氧空位含量明显提升,使其吸附大量水分,促进水分子分解为导电离子,提高NaTaO3/SnO2湿度传感器的响应和恢复速度。该NaTaO3/SnO2湿度传感器电阻达到3个数量级,在11%~95%相对湿度范围内具有高响应度(303,959%)、良好的线性度、低的湿滞(1.99%)、长期稳定性和快的响应和恢复时间(分别为15 s和13 s)。通过对NaTaO3/SnO2湿度传感器的复阻抗谱分析,对其传感机理进行了解释。NaTaO3/SnO2复合材料的成功制备也为具有高湿敏性能的NaTaO3基电阻传感器的设计开辟了新的方向。

NaTaO3/SnO2 nanomaterials were prepared by hydrothermal method, and their humidity sensing properties were studied systematically in this paper. The experimental results show that the specific surface area of NaTaO3/SnO2 composite is larger than that of pure NaTaO3, which makes the surface of the composite absorb more water molecules and enhances the response of NaTaO3/SnO2 humidity sensor. The oxygen vacancies on the surface of NaTaO3/SnO2 composite material are significantly increased, which makes it absorb a large amount of water, promote the decomposition of water molecules into conductive ions, and improve the response and recovery speed of NaTaO3/SnO2 humidity sensor. The NaTaO3/SnO2 humidity sensor has a resistance of 3 orders of magnitude, high responsiveness (303,959%), good linearity, low hysteresis (1.99%), long-term stability and fast response and recovery time (15 s and 13 s, respectively) in the range of 11%~95% relative humidity. By analyzing the complex impedance spectrum of NaTaO3/SnO2 humidity sensor, the sensing mechanism was explained. The successful prepara-tion of NaTaO3/SnO2 composites also provides a new direction for the design of high humidity-sensitive NaTaO3-based resistance sensors.