Methylamine Thiocyanate-doped FA 0.8Cs 0.2PbI 2Br Perovskite Sensor for Sensitive and Ultrafast Detection of NO 2 at Room Temperature
10.19756/j.issn.0253-3820.251045
- VernacularTitle:硫氰酸甲铵掺杂FA0.8Cs0.2PbI2Br钙钛矿传感器在室温下对二氧化氮的超快速检测
- Author:
Yan-Shang GONG
1
;
Meng-Han ZHAO
;
Jian-Kun SUN
;
Li-Xue ZHANG
Author Information
1. 青岛大学化学化工学院,山东省高等学校氢能关键材料与技术协同创新中心,青岛 266071
- Keywords:
NO 2 sensor;
Halide perovskite;
Molecular doping;
Room temperature detection;
Rapid response
- From:
Chinese Journal of Analytical Chemistry
2025;53(4):525-534,中插1-中插8
- CountryChina
- Language:Chinese
-
Abstract:
Nitrogen dioxide(NO 2)is a prevalent air pollutant that poses significant threats to the environment and human health,emphasizing the urgent need for high-performance NO 2 sensors for effective environmental monitoring at room temperature.Sensors based on metal halide perovskites have emerged as promising candidates for gas detection at room temperature,but their long-term stability remains a major challenge.In this study,a methylamine thiocyanate(MT)-doped FA 0.8Cs 0.2PbI 2Br(PVK)gas sensor(MT-PVK)was prepared using a simple one-step spin-coating method and ethyl acetate(EA)anti-solvent extraction technique.The crystalline structure,chemical composition,and particle morphology of the MT-PVK thin film were characterized.The MT-PVK thin film was then utilized as a gas sensor for NO 2 detection at room temperature.The results demonstrated that the sensor exhibited outstanding selectivity and reversibility at low concentrations of NO 2 gas,with a detection limit as low as 33 ppb(10-9,nL/L).For 10 ppm(10-6,μL/L)NO 2,the sensor showed rapid response and recovery time of only 1.6 s and 27 s,outperforming most traditional metal oxide NO 2 sensors.Furthermore,compared to the original PVK,the MT molecules significantly enhanced the structural and sensing stability of the MT-PVK sensor under high humidity conditions(55%±5%).These findings suggested that MT-doped FA 0.8Cs 0.2PbI 2Br perovskite gas sensors offered a promising pathway for the development of rapid-response gas sensing technologies suitable for room temperature operation.
