Yan Huangping, Chen Zilu, Zeng Linyuan, Wang Zijun, Zheng Gaofeng, Zhou Rui
School of Aerospace Engineering, Xiamen University, Xiamen 361005, China.
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China.
Nanomaterials (Basel). 2021 Dec 12;11(12):3368. doi: 10.3390/nano11123368.
The development of a flexible and high-performance humidity sensor is essential to expand its new applications, such as personal health monitoring and early diagnosis. In this work, SnO/rGO nanocomposites were prepared by one-step hydrothermal method. The effect of rGO-doping on humidity sensing performance was investigated. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the nanostructure, morphology and chemical composition of SnO/rGO nanocomposites. The SnO/rGO humidity sensitive film was prepared by electrospinning on a polyimide film modified with gold electrodes. The humidity test results show that different doping ratios of rGO have different effects on humidity sensing properties. Among them, the sensor with 2 wt% rGO-doping has a high sensitivity (37,491.2%) within the humidity range as well as the fast response time (80 s) and recover time (4 s). Furthermore, the sensor with 2 wt% rGO-doping remains good flexibility and stability in the case of bending (1000 times). The sensitivity of the 2 wt% rGO-doping sensor at the bending radius (8 mm and 4 mm) is 48,219% and 91,898%, respectively. More importantly, the sensor could reflect different breathing states clearly and track breathing intervals as short as 3 s. The SnO/rGO flexible humidity sensor with accuracy, flexibility and instantaneity as well as the facile fabrication strategy is conceivable to be applied in the potential application for human health real-time monitoring.
开发一种灵活且高性能的湿度传感器对于拓展其新应用至关重要，如个人健康监测和早期诊断。在这项工作中，通过一步水热法制备了SnO/rGO纳米复合材料。研究了rGO掺杂对湿度传感性能的影响。利用扫描电子显微镜、透射电子显微镜、X射线衍射和拉曼光谱对SnO/rGO纳米复合材料的纳米结构、形态和化学成分进行了表征。通过静电纺丝在修饰有金电极的聚酰亚胺薄膜上制备了SnO/rGO湿度敏感薄膜。湿度测试结果表明，不同rGO掺杂比例对湿度传感性能有不同影响。其中，rGO掺杂量为2 wt%的传感器在湿度范围内具有高灵敏度（37,491.2%）以及快速响应时间（80 s）和恢复时间（4 s）。此外，rGO掺杂量为2 wt%的传感器在弯曲（1000次）情况下仍保持良好的柔韧性和稳定性。2 wt% rGO掺杂传感器在弯曲半径为8 mm和4 mm时的灵敏度分别为48,219%和91,898%。更重要的是，该传感器能够清晰地反映不同的呼吸状态，并跟踪短至3 s的呼吸间隔。具有准确性、柔韧性和即时性以及简便制备策略的SnO/rGO柔性湿度传感器有望应用于人体健康实时监测的潜在应用中。
