Issue 22, 2024

Halide-dependent humidity sensing of Cs2SnX6 (X = Cl, Br, I) perovskites for real-time human physiological moisture detection

Abstract

Halide perovskites (HPs) have received increasing attention in the last two decades due to unique component diversity and structural tunability, although additional efforts are necessary for HPs beyond photovoltaic and light-emitting domains, e.g. gas/humidity sensing. Here, all-inorganic lead-free HPs Cs2SnX6 (X = Cl, Br, I) were synthesized by simple room-temperature precipitation without any surfactant or organic solution. Afterwards, Cs2SnX6 HPs were systematically investigated in terms of structure, morphology, energy band and surface state. Explored as humidity sensing materials, Cs2SnX6 exhibit favorable humidity sensing performance with a response sequence of Cs2SnCl6 > Cs2SnBr6 > Cs2SnI6. Remarkably, the Cs2SnCl6 sensor achieves a long-term stability at 11–97% relative humidity (RH) and a high response value of 4 orders of magnitude (3.6 × 104) with a short response time (15 s). Furthermore, the precise humidity detection capability makes the Cs2SnCl6 sensor extremely promising for real-time, non-contact human breath and finger monitoring. Ultimately, complex impedance spectra at various RH levels provide an explanation for the humidity sensing mechanism. In addition to offering an optional material for humidity sensors, this work offers fresh perspectives on next-generation sensory devices that use lead-free HPs to detect physiological aspects of human health.

Graphical abstract: Halide-dependent humidity sensing of Cs2SnX6 (X = Cl, Br, I) perovskites for real-time human physiological moisture detection

Supplementary files

Article information

Article type
Paper
Submitted
09 апр 2024
Accepted
12 май 2024
First published
24 май 2024

J. Mater. Chem. C, 2024,12, 7901-7908

Halide-dependent humidity sensing of Cs2SnX6 (X = Cl, Br, I) perovskites for real-time human physiological moisture detection

C. Guo, C. Wang, L. Zhang, Q. Qiu, M. Zhu, J. Yin and L. Bie, J. Mater. Chem. C, 2024, 12, 7901 DOI: 10.1039/D4TC01463D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements