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

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 pe...

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Bibliographic Details
Published in:	Sensors and actuators. B, Chemical Vol. 412; p. 135810
Main Authors:	Alaih, Akhmad Futukhillah Fataba, Triyono, Djoko, Dwiputra, Muhammad Adam, Nugroho, Ferry Anggoro Ardy
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-08-2024
Subjects:	High performance sensors LaFeO3 Response time Specific surface area Transducer materials Water vapor LaFeO3 Specific surface area Transducer materials Response time Water vapor High performance sensors
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Summary:	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 LaFeO3 perovskite. Integrating Ti into the perovskite using a sol-gel method, i.e., LaFe0.925Ti0.075O3, 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 LaFeO3 introduces a tunable porosity and surface area in the perovskite.•The porous LaFe0.925Ti0.075O3 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.
ISSN:	0925-4005 1873-3077
DOI:	10.1016/j.snb.2024.135810