Issue 16, 2022

Optical humidity sensors based on lead-free Cu-based perovskite nanomaterials

Abstract

Organometallic halide perovskite materials possess unique and tunable optical properties with a wide range of optoelectronic applications. However, these materials suffer from humidity-driven degradation in ambient atmospheres. In this paper we investigate stable copper-based perovskite nanocrystals for potential use in humidity sensors, specifically examining their unique humidity-dependent optical properties and reversibility. We controlled stoichiometric ratios of Cu-based perovskites and demonstrated that (methylammonium)2CuBr4 nanocrystals showed excellent reversible physisorption of water molecules. These perovskite nanocrystals exhibited reversible hydro-optical properties, including transparency changes in response to variations in relative humidity under ambient conditions. The perovskite nanomaterial humidity sensor was highly reliable and stable, with a linear correlation in a relative humidity range of 7% to 98%. Accordingly, the lead-free Cu-based perovskite materials developed herein have the potential to be employed as real-time, self-consistent humidity sensors.

Graphical abstract: Optical humidity sensors based on lead-free Cu-based perovskite nanomaterials

Associated articles

Article information

Article type
Communication
Submitted
18 Mar 2022
Accepted
06 Jun 2022
First published
08 Jun 2022
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2022,4, 3309-3317

Optical humidity sensors based on lead-free Cu-based perovskite nanomaterials

H. Lee, D. Lee, H. Jin, D. Baek, M. K. Kim, J. Cha, S. Kim and M. Kim, Nanoscale Adv., 2022, 4, 3309 DOI: 10.1039/D2NA00168C

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