Zhang Yueying, Lv Siyuan, Jiang Li, Liu Fangmeng, Wang Jing, Yang Zijie, Wang Bin, You Rui, Wang Chenguang, Yan Xu, Sun Peng, Gao Yuan, Liang Xishuang, Lu Geyu
State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
School of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China.
ACS Sens. 2021 Dec 24;6(12):4435-4442. doi: 10.1021/acssensors.1c01838. Epub 2021 Dec 2.
Portable and sensitive mixed-potential type solid-state electrolyte (MPSE) gas sensors can detect exhaled biomarkers in a noninvasive and inexpensive way, which is significant for convenient disease diagnosis and saving medical resources. However, high working temperature is still one of the main bottlenecks for hindering MPSE gas sensors' applications in disease diagnosis. Here, we, for the first time, developed and fabricated new room-temperature MPSE gas sensors utilizing KFeO electrolyte and Ni/Fe-MOF (Ni/Fe clusters are coordinated with 1,4-HBDC) sensing electrodes (SEs) for the detection of ppb-level NO. Among different MOF SEs, the sensor attached with the Ni-MOF SE presents the highest NO sensitivities. This is attributed to a reducing oxygen reduction reaction activity and enhancing NO electrochemical catalytic reaction activity, verified by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. In addition, the presented sensor also shows a low detection limit (20 ppb), fast response/recovery characteristic (17 s/6 s to 50 ppb NO), excellent selectivity, acceptable repeatability, and long-term stability of 34 days to NO at 25 °C and 60%RH. Simultaneously, the mechanism of humidity effect on the sensing performance was investigated by EIS and CV tests. Our work provides new insight into the development of room-temperature solid-state electrolyte gas sensors based on the mixed-potential mechanism and enlarges the potential application domain.
便携式且灵敏的混合电位型固态电解质（MPSE）气体传感器能够以无创且低成本的方式检测呼出的生物标志物，这对于便捷的疾病诊断和节省医疗资源具有重要意义。然而，高工作温度仍然是阻碍MPSE气体传感器在疾病诊断中应用的主要瓶颈之一。在此，我们首次开发并制造了新型室温MPSE气体传感器，该传感器利用KFeO电解质和Ni/Fe-MOF（Ni/Fe簇与1,4-HBDC配位）传感电极（SEs）来检测ppb级别的NO。在不同的MOF SEs中，附着有Ni-MOF SE的传感器表现出最高的NO灵敏度。这归因于氧还原反应活性的降低和NO电化学催化反应活性的增强，这通过循环伏安法（CV）和电化学阻抗谱（EIS）测试得到了验证。此外，所展示的传感器还具有低检测限（20 ppb）、快速响应/恢复特性（对50 ppb NO为17 s/6 s）、出色的选择性、可接受的重复性以及在25°C和60%RH条件下对NO长达34天的长期稳定性。同时，通过EIS和CV测试研究了湿度对传感性能的影响机制。我们的工作为基于混合电位机制的室温固态电解质气体传感器的开发提供了新的见解，并扩大了其潜在应用领域。
