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1 Metrology and Measurement Systems

1 2025

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Analyzing BaSrTiO3 gas sensor properties under NO2 exposure: the impact of impedance spectroscopy

Szafraniak Bartłomiej, Fuśnik Łukasz, Xu Jie, Gao Feng, Brudnik Andrzej, Drewniak Sabina, Maciak Erwin, Błajszczak Łukasz, Rydosz Artur

Metrology and Measurement Systems

2025

Vol. 32, nr 1

1--19

Impedance spectroscopy is an appropriate technique for studying the complexity of materials, in which their different frequency relationships can be exploited in such a manner that they can be efficiently separated. Barium strontium titanate BaSrTiO3 (BST) is a ferroelectric material with unique properties that make it useful in a range of electronic applications. BST plays an important role in the field of gas-sensing applications. The potential application of BST material as a gas sensor for detecting nitrogen dioxide (NO2) in the atmosphere was studied. Impedance spectroscopy studies were conducted across a wide frequency range from 10-1 to 106 Hz, in the temperature range of 100˚C to 350˚C and a relative humidity of 50%, and both in air and the presence of NO2 in concentrations from 0.5 to 5 ppm. The results of the impedance analysis indicate that the broadband models, which comprise both single and parallel RC elements, can accurately represent the NO2 gas interaction mechanism with the gas-sensitive layer of the BST material. These models were found to effectively capture changes in parameters associated with the interaction.