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Ultrafast and low-hysteresis humidity sensors based on mesoporous LaFe0.925Ti0.075O3 perovskite.

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Title: Ultrafast and low-hysteresis humidity sensors based on mesoporous LaFe0.925Ti0.075O3 perovskite.
Authors: Alaih, Akhmad Futukhillah Fataba1 (AUTHOR), Triyono, Djoko1 (AUTHOR), Dwiputra, Muhammad Adam1 (AUTHOR), Nugroho, Ferry Anggoro Ardy1 (AUTHOR) f.a.a.nugroho@sci.ui.ac.id
Source: Sensors & Actuators B: Chemical. Aug2024, Vol. 412, pN.PAG-N.PAG. 1p.
Subjects: Perovskite, Humidity, Detectors, Sol-gel processes, Hysteresis, Surface area
Abstract: Humidity sensors are omnipresent. Thus, significant efforts have been undertaken to advance their performance, for example, to have a fast detection time, negligible hysteresis, and excellent stability. Despite numerous active research endeavors, establishing a sensor that excels in all these key performances is still challenging. Here, we address this challenge by designing a capacitive-based humidity sensor employing porous LaFeO 3 perovskite. Integrating Ti into the perovskite using a sol-gel method, i.e. , LaFe 0. 925 Ti 0. 075 O 3 , results in a 400% increase in specific surface area achieved through pore formation, translating to a 2094% response parameter. Furthermore, due to the rapid equilibrium between adsorption and desorption processes, the sensor achieves ultrafast 4.4 s response time and 1.4 s recovery time, with <1% hysteresis and excellent stability over 28 days, when assessed at 300 K. Our work significantly advances current humidity sensor performance and, in a broader context, emphasizes the efficacy of porous (perovskite) materials for high performance gas detection. [Display omitted] • Incorporating Ti into LaFeO 3 introduces a tunable porosity and surface area in the perovskite. • The porous LaFe 0.925 Ti 0.075 O 3 exhibits ultrafast response/recovery times and negligible hysteresis. • This metrics puts the sensor among the highest-performing sensors in the literature. • The humidity sensing mechanisms is also explained though impedance measurement. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Humidity sensors are omnipresent. Thus, significant efforts have been undertaken to advance their performance, for example, to have a fast detection time, negligible hysteresis, and excellent stability. Despite numerous active research endeavors, establishing a sensor that excels in all these key performances is still challenging. Here, we address this challenge by designing a capacitive-based humidity sensor employing porous LaFeO 3 perovskite. Integrating Ti into the perovskite using a sol-gel method, i.e. , LaFe 0. 925 Ti 0. 075 O 3 , results in a 400% increase in specific surface area achieved through pore formation, translating to a 2094% response parameter. Furthermore, due to the rapid equilibrium between adsorption and desorption processes, the sensor achieves ultrafast 4.4 s response time and 1.4 s recovery time, with <1% hysteresis and excellent stability over 28 days, when assessed at 300 K. Our work significantly advances current humidity sensor performance and, in a broader context, emphasizes the efficacy of porous (perovskite) materials for high performance gas detection. [Display omitted] • Incorporating Ti into LaFeO 3 introduces a tunable porosity and surface area in the perovskite. • The porous LaFe 0.925 Ti 0.075 O 3 exhibits ultrafast response/recovery times and negligible hysteresis. • This metrics puts the sensor among the highest-performing sensors in the literature. • The humidity sensing mechanisms is also explained though impedance measurement. [ABSTRACT FROM AUTHOR]
ISSN:09254005
DOI:10.1016/j.snb.2024.135810