Zhang Fuzheng, Lin Qijing, Han Feng, Wang Zuowei, Tian Bian, Zhao Libo, Dong Tao, Jiang Zhuangde
State Key Laboratory for Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, 710049 Xi'an, China.
Chongqing Key Laboratory of Micro-Nano Systems and Intelligent Sensing, Chongqing Academician Workstation, Chongqing 2011 Collaborative Innovation Center of Micro/Nano Sensing and Intelligent Ecological Internet of Things, Chongqing Technology and Business University, 400067 Chongqing, China.
Microsyst Nanoeng. 2022 Apr 12;8:40. doi: 10.1038/s41378-022-00369-z. eCollection 2022.
Flexible sensors used to detect NO gas generally have problems such as poor repeatability, high operating temperature, poor selectivity, and small detection range. In this work, a new spraying platform with a simple structure, low cost, and good film-forming consistency was designed and built to make a sensitive film (rGO/SnO) for NO gas sensors. The relationship between the solid content of rGO and SnO nanoparticles, annealing temperature, and sensor performance was studied. The results show that the interdigital electrode-sensitive film formed by spraying 0.25 ml of a 0.4 wt% rGO/SnO mixture and annealing at 250 °C exhibited the best comprehensive performance for NO detection. The sensor's response value for 100 ppm NO gas was 0.2640 at room temperature (25 °C), and the response time and recovery time were 412.4 s and 587.3 s, respectively. In the range of 20-100 ppm, the relationship between the response and NO concentration was linear, and the correlation coefficient was 0.9851. In addition, a soft-monitoring node module with an overlimit warning function for NO gas was designed and manufactured based on flexible electronics. Finally, the flexible sensor and node module were embedded into woven fabric that could be used to make a mask or a watch that could detect NO gas, realizing the practical application of flexible NO gas sensors in the field of wearable electronics.
用于检测一氧化氮（NO）气体的柔性传感器通常存在诸如重复性差、工作温度高、选择性差以及检测范围小等问题。在这项工作中，设计并搭建了一种结构简单、成本低廉且成膜一致性良好的新型喷涂平台，用于制备用于NO气体传感器的敏感薄膜（rGO/SnO）。研究了rGO和SnO纳米颗粒的固含量、退火温度与传感器性能之间的关系。结果表明，通过喷涂0.25 ml的0.4 wt% rGO/SnO混合物并在250 °C下退火形成的叉指电极敏感薄膜对NO检测表现出最佳的综合性能。该传感器在室温（25 °C）下对100 ppm NO气体的响应值为0.2640，响应时间和恢复时间分别为412.4 s和587.3 s。在20 - 100 ppm范围内，响应与NO浓度之间呈线性关系，相关系数为0.9851。此外，基于柔性电子器件设计并制造了具有NO气体超限预警功能的软监测节点模块。最后，将柔性传感器和节点模块嵌入到织物中，可用于制作能够检测NO气体的口罩或手表，实现了柔性NO气体传感器在可穿戴电子领域的实际应用。
