Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830046, China.
School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China.
Sensors (Basel). 2021 Dec 31;22(1):293. doi: 10.3390/s22010293.
A high-performance zinc oxide/tin dioxide (ZnO/SnO) humidity sensor was developed using a simple solvothermal method. The sensing mechanism of the ZnO/SnO humidity sensor was evaluated by analyzing its complex impedance spectra. The experimental results prove that the ZnO/SnO composite material has a larger specific surface area than pure SnO, which allows the composite material surface to adsorb more water to enhance the response of the ZnO/SnO humidity sensor. ZnO can also contribute to the generation of oxygen-rich vacancies on the ZnO/SnO composite material surface, allowing it to adsorb a large amount of water and rapidly decompose water molecules into conductive ions to increase the response and recovery speed of the ZnO/SnO humidity sensor. These characteristics allowed the Z/S-2 humidity sensor to achieve a higher response (1,225,361%), better linearity, smaller hysteresis (6.6%), faster response and recovery speeds (35 and 8 s, respectively), and long-term stability at 11-95% relative humidity. The successful preparation of the ZnO/SnO composite material also provides a new direction for the design of SnO-based resistance sensors with high humidity-sensing performance.
采用简单的溶剂热法制备了高性能的氧化锌/氧化锡（ZnO/SnO）湿度传感器。通过分析其复阻抗谱评估了 ZnO/SnO 湿度传感器的传感机制。实验结果证明，与纯 SnO 相比，ZnO/SnO 复合材料具有更大的比表面积，这使得复合材料表面能够吸附更多的水，从而增强 ZnO/SnO 湿度传感器的响应。ZnO 还可以促进 ZnO/SnO 复合材料表面富氧空位的产生，使其能够吸附大量的水，并迅速将水分子分解为导电离子，从而提高 ZnO/SnO 湿度传感器的响应和恢复速度。这些特性使得 Z/S-2 湿度传感器具有更高的响应（1,225,361%）、更好的线性度、更小的滞后（6.6%）、更快的响应和恢复速度（分别为 35 和 8 s），以及在 11-95%相对湿度下的长期稳定性。ZnO/SnO 复合材料的成功制备也为设计具有高湿度传感性能的基于 SnO 的电阻传感器提供了新的方向。
