Fast-Response Oxygen Optical Fiber Sensor based on PEA 2 SnI 4 Perovskite with Extremely Low Limit of Detection

• Published in: Advanced science 2022-03, Vol.9 (8), p.e2104708
• Main Authors: Cai, Shunshuo, Ju, Yangyang, Wang, Yangming, Li, Xiaowei, Guo, Tuan, Zhong, Haizheng, Huang, Lingling
• Format: Article
• Language: English
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.202104708

Oxygen sensor is an important technique in various applications including industrial process control, medical equipment, biological fabrication, etc. The reported optical fiber-based configurations so far, using gas-sensitive coating do not meet the stringent performance targets, such as fast response time and low limit of detection (LOD). Tin-based halide perovskites are sensitive to oxygen with potential use for sensor applications. Here, the halide perovskite-based oxygen optical fiber sensor by combining phenylethylammonium tin iodide (PEA SnI ) and tilted fiber Bragg grating (TFBG) is demonstrated. The PEA SnI -based oxygen optical fiber sensor is reversible at room temperature with a response time of about 10 s, and the experimental LOD approaches to an extremely low oxygen concentration of about 50 ppm. The as-fabricated oxygen sensor shows a relative response change of 0.6 dB for an oxygen concentration increase from 50 ppm to 5% with good gas selection against NO , CO, CO , H . This work extends the sensor applications of halide perovskites, providing a novel technique for rapid and repeatable oxygen gas detection at a low level.