2024/11/27 by Aikaterini Argyrou, Rafaela Maria Giappa, Argyrou, Aikaterini +13
Chemical Engineering · Engineering · #Analytical Chemistry and Sensors #Applied Physics (physics.app-ph) #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Gas Sensing Nanomaterials and Sensors #Materials Science (cond-mat.mtrl-sci) #Perovskite Materials and Applications
paper · pdf · doi:10.48550/arxiv.2411.18228
openalex publication_date 2024/11/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Lead halide perovskites have attracted considerable attention as potential gas sensing elements due to their unique ability to detect and respond to an external stimulus with measurable electrical or optical signals. The distinctive characteristics of these materials lie in their ability to operate upon gas exposure at room temperature. However, the presence of lead (Pb) poses a serious challenge for their widespread application and commercialization, owing to its toxicity. To address this issue, lead-free Cs2AgBiBr6 double perovskite is explored as a promising alternative sensing element for room temperature gas detection. This sensor can be regarded as eco-friendly for the following reasons: it does not contain Pb; it is synthesized at room temperature without using strong organic solvents; and it operates and recovers at room temperature without heating or UV irradiation and with a very low input voltage (0.1V), thus reducing overall energy consumption. The influence of the perovskite morphology on the ozone (O3) sensing performance is investigated, as well as the sensing stability under varying conditions of time, humidity, and temperature. Notably, the sensors' exceptional selectivity for O3 over other gases and the interaction between the gases and the perovskite surface is confirmed through experimental and first-principles calculations.