Highly stable humidity sensor based on lead-free Cs3Bi2Br9 perovskite for breath monitoring. Issue 34 (5th August 2021)

• Record Type: Journal Article
• Authors: Pi, Chaojie; Chen, Weiqing; Zhou, Wei; Yan, Shuangpeng; Liu, Zhichao; Wang, Chao; Guo, Qian; Qiu, Jianbei; Yu, Xue; Liu, Bitao; Xu, Xuhui
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 34(2021)
• Page Start: 11299
• Page End: 11305
• Publication Date: 2021-08-05
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc02339j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Cs3 Bi2 Br9 thin films were explored as a perovskite-based humidity sensor with excellent reliability and stability for over 35 days. Abstract : Perovskite materials as humidity sensors for breath monitoring have attracted tremendous attention in recent years due to their cost effectiveness, easy fabrication process, and controllable and adjustable performance, showing great potential in portable wearable devices. However, the long-term performance of the perovskite-based humidity sensor is far from satisfied for the issue of the intrinsic instability of the related perovskites, especially working at a high humidity range. In this work, we demonstrate a superior resistive-type Cs3 Bi2 Br9 humidity sensor for the first time, which exhibits a reliable performance for over 35 days under a 90% relative humidity (RH). Ultrafast response (5.56 s) and recovery time (6.237 s) are achieved for the proposed sensors with outstanding repeatability and selectivity in a wide range of humidity detection. Owing to its good stability and superfast response, the Cs3 Bi2 Br9 perovskite-based humidity sensor is integrated with a commercially available mask for real-time monitoring of the changes in the respiratory rate of an adult under different physiological states, providing a facile and reliable path for diagnostic breath analysis.