Improved humidity sensing through Mg substitution in LaFeO₃ perovskite.
- 1Department of Physics, Faculty of Mathematic and Natural Sciences (FMIPA), Universitas Indonesia Depok 16424 Indonesia [email protected].
Abstract
Perovskite-based LaFe1-x Mg x O₃ (x = 0.0, 0.1, and 0.3) humidity sensors are fabricated on alumina substrates with gold interdigitated electrodes via drop-casting method. All sensors exhibit distinct humidity responses over a relative humidity (RH) range of 11-96%, with capacitance increasing monotonically as RH increased. The calculated sensitivities are 6.79, 8.97, and 6.55 pF/% RH for x = 0.0, 0.1, and 0.3, respectively, indicating that Mg substitution at x = 0.1 significantly enhances sensitivity, likely due to the increased density of hydrophilic adsorption sites. All sensors exhibit very low hysteresis (0.04-0.15%), demonstrating highly reversible adsorption-desorption behavior. The response/recovery times are 9.9 s/1.9 s, 11.6 s/4.5 s, and 20.7 s/3.8 s for x = 0.0, 0.1, and 0.3, respectively, a trade-off between sensitivity and response dynamics at higher Mg content. Stability tests over 32 days at laboratory scale reveals performance degradations of 2.8%, 0.11%, and 0.78% for x = 0.0, 0.1, and 0.3, respectively, confirming that Mg substitution improves the long-term stability. Overall, the composition x = 0.1 provides the optimal balance between sensitivity and stability, highlighting Mg substitution as an effective strategy for improving perovskite-based humidity sensors.
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BibTeX
@article{triyono2026improved,
title = {{Improved humidity sensing through Mg substitution in LaFeO₃ perovskite.}},
author = {Djoko Triyono and Hoerudin Bayu Hidayah and Akhmad Futukhillah Fataba Alaih and Rifqi Almusawi Rafsanjani and Heidi Laysandra},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra02831d},
url = {https://europepmc.org/article/MED/42909231},
note = {CC BY},
}
RIS
TY - JOUR
TI - Improved humidity sensing through Mg substitution in LaFeO₃ perovskite.
AU - Djoko Triyono
AU - Hoerudin Bayu Hidayah
AU - Akhmad Futukhillah Fataba Alaih
AU - Rifqi Almusawi Rafsanjani
AU - Heidi Laysandra
PY - 2026
DA - 2026/10/21
JO - RSC advances
DO - 10.1039/d6ra02831d
UR - https://europepmc.org/article/MED/42909231
AB - Perovskite-based LaFe1-x Mg x O₃ (x = 0.0, 0.1, and 0.3) humidity sensors are fabricated on alumina substrates with gold interdigitated electrodes via drop-casting method. All sensors exhibit distinct humidity responses over a relative humidity (RH) range of 11-96%, with capacitance increasing monotonically as RH increased. The calculated sensitivities are 6.79, 8.97, and 6.55 pF/% RH for x = 0.0, 0.1, and 0.3, respectively, indicating that Mg substitution at x = 0.1 significantly enhances sensitivity, likely due to the increased density of hydrophilic adsorption sites. All sensors exhibit very low hysteresis (0.04-0.15%), demonstrating highly reversible adsorption-desorption behavior. The response/recovery times are 9.9 s/1.9 s, 11.6 s/4.5 s, and 20.7 s/3.8 s for x = 0.0, 0.1, and 0.3, respectively, a trade-off between sensitivity and response dynamics at higher Mg content. Stability tests over 32 days at laboratory scale reveals performance degradations of 2.8%, 0.11%, and 0.78% for x = 0.0, 0.1, and 0.3, respectively, confirming that Mg substitution improves the long-term stability. Overall, the composition x = 0.1 provides the optimal balance between sensitivity and stability, highlighting Mg substitution as an effective strategy for improving perovskite-based humidity sensors.
SN - 2046-2069
ER -