The role of chemisorption and physisorption in Fe-doped SnO2 acetone sensors
Shynybekov Y. Soltabayev B. Mentbayeva A. Turlybekuly A.
January 2026KeAi Communications Co.
Sensors International
2026#7
The gas sensing mechanism is one of the most important parameters of chemiresistive gas sensors, and distinguishing them opens the possibility of manipulating sensor performance. In this study, we introduced the concept of adsorption-type contribution to the gas-sensing performance that could further enhance the fundamental understanding of gas-sensing mechanisms and aid future sensor development. The proposed concept was applied for the examination of Fe-doped SnO2 gas sensors ionic obtained through the successive layer adsorption and reaction (SILAR) method. The 0.5 mol.% Fe-doped SnO2 sensor demonstrated a sensing response of 118 % to 25 ppm acetone at a relatively low optimal working temperature of 175 °C, and a temperature-induced p–n junction shift at around 50 °C. It had an LOD of approximately 250 ppb and a linear sensing range that extended to 25 ppm. Notably, the sensor had a response time of approximately 52 s and a recovery time of around 14 s. These results suggest the potential of Fe-doped SnO2 sensors for acetone detection relevant to self-diagnosis and health monitoring.
Acetone detection , Breath analysis , Chemiresistive gas sensors , Diabetes diagnosis , Fe-doped SnO2 , Fundamentals of surface-gas interaction , Physisorption and chemisorption
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Advanced Sensors Laboratory, National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
Advanced Sensors Laboratory
Department of Chemical and Materials Engineering
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026