Close-loop recyclable and flexible halide perovskite@wool keratin sensor with piezoelectric property

• Published in: Journal of energy chemistry Vol. 84; pp. 428 - 435
• Main Authors: Zhou, Yingying, Gao, Dangge, Lyu, Bin, Zheng, Chi, Tang, Litao, Guo, Shihao, Ma, Jianzhong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2023
• Subjects: Halide perovskite; Human monitoring; Piezoelectric; Sensor; Wool keratin; Wool keratin; Human monitoring; Halide perovskite; Piezoelectric; Sensor
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2023.05.005

Wool keratin was used as a multidentate ligand to enhance the stability of lead halide perovskite via passivation and coating to construct a multifunctional nanofiber film. [Display omitted] Halide perovskites with excellent piezoelectric properties, but their poor stability hinders their large-scale application. Herein, a sandwich-structured halide perovskite flexible sensor with good stability was developed according to a three-step procedure as follows: (i) in-situ growth of wool keratin-CsPbBr3 (WK-CsPbBr3) using wool keratin in interfacial passivation and coating, (ii) electrospinning of a wool keratin-CsPbBr3/polyacrylonitrile (WCP) nanofiber film, and (iii) coating of the WCP nanofiber with polydimethylsiloxane (PDMS) to obtain a sensor (WCPP). The sensor could generate a piezoelectric voltage of 7.8 V at a pressure of 6 kPa in the stages of pressing and releasing, and the output characteristics did not decline even after 10,000 cycles. Compared to the 4-month stability of the perovskite sensor, WCPP sensor exhibited the output performance even after 16 months, which indicated that wool keratin as a multidentate improved the stability of the halide perovskite. Additionally, the sensor displayed a self-cleaning property and could also light up 14 commercial LEDs. The close-loop recycling of the lead halide perovskite was achieved by dissolving the WCP nanofiber film in DMF and then re-electrospinning. Therefore, the method proposed is a step forward for achieving the commercialization of WK-CsPbBr3 and providing new avenues for further utilization of wool waste.