Sendogdular Selda Topcu, Sendogdular Levent
Department of Metallurgical and Material Engineering, Erciyes University, Kayseri 38039, Türkiye.
ACS Omega. 2025 Apr 8;10(15):15572-15586. doi: 10.1021/acsomega.5c00664. eCollection 2025 Apr 22.
Relative humidity is a significant factor that impairs gas sensor performance. Some investigations have heated sensors to temperatures beyond 100 °C to eliminate relative humidity, negatively affecting the sensor stability and application range. To improve the sensitivity of gas sensors that operate at room temperatures, free-standing polymer films with moisture barrier qualities are applied to various sensor architectures. A selective permeable polymer membrane applied to the air interface of the sensors, with or without contact, is intended to lessen the effects of relative humidity on sensor sensitivity. In this study, ZnO structures were synthesized by using electrospinning methods. Selective permeable polystyrene/poly(ethylene glycol) (PS/PEG) polymer film membranes were produced on the synthesized nanofiber structures and applied to the sensor. In the membrane synthesis, the CO annealing process was applied to control the porosity O and moisture permeability. Gas sensor performance tests for NO and H gases were conducted for these synthesized nanostructures and membranes by using various characterization techniques and analyses. Gas-sensing measurements were performed in dry air and a relative humidity (RH) of 50%, employing different concentrations of NO and H gases. Different sensing parameters (response time, recovery time, sensitivity) were estimated at room temperature for samples, and the sensor sensitivity was 0.0152 at 50 ppm. Sensor response is enhanced approximately fivefold by samples with polymeric membrane measurements compared to without. Nanofibers exhibit 120 and 300 s response time and recovery time for NO gas, respectively. As a result, a new approach to the literature has been provided to reduce the effects of RH on the sensor, which is one of the biggest obstacles in the scope of gas sensors operating at room temperature. Therefore, this study's findings open a general approach for fabricating flexible devices for gas detection applications.
相对湿度是影响气体传感器性能的一个重要因素。一些研究将传感器加热到100°C以上以消除相对湿度，但这会对传感器的稳定性和应用范围产生负面影响。为了提高室温下工作的气体传感器的灵敏度，具有防潮性能的独立聚合物薄膜被应用于各种传感器结构中。一种应用于传感器空气界面的选择性渗透聚合物膜，无论有无接触，旨在减轻相对湿度对传感器灵敏度的影响。在本研究中，采用静电纺丝法合成了氧化锌结构。在合成的纳米纤维结构上制备了选择性渗透聚苯乙烯/聚乙二醇（PS/PEG）聚合物薄膜，并将其应用于传感器。在膜的合成过程中，采用CO退火工艺来控制孔隙率和透湿性。通过各种表征技术和分析，对这些合成的纳米结构和膜进行了NO和H气体的气体传感器性能测试。在干燥空气和50%相对湿度（RH）下，使用不同浓度的NO和H气体进行气敏测量。在室温下对样品估计了不同的传感参数（响应时间、恢复时间、灵敏度），在50 ppm时传感器灵敏度为0.0152。与没有聚合物膜测量的样品相比，有聚合物膜测量的样品的传感器响应提高了约五倍。纳米纤维对NO气体的响应时间和恢复时间分别为120秒和300秒。因此，本研究为减少相对湿度对传感器的影响提供了一种新的方法，相对湿度是室温下工作的气体传感器领域中最大的障碍之一。因此，本研究的结果为制造用于气体检测应用的柔性器件开辟了一种通用方法。
