EXHALED ACETONE GAS SENSORS BASED ON Fe-DOPED SnO2Amanzhol Turlybekuly1; Ernar Shynybekov1
1Nazarbayev University, Astana, KazakhstanPAPER: 267/AdvancedMaterials/Regular (Oral) OS
SCHEDULED: 15:25/Wed. 23 Oct. 2024/Ariadni B
ABSTRACT:The development of acetone gas sensors for self-diagnostic and health monitoring applications has garnered significant interest in recent years [1]. Accurate sensing of acetone levels is crucial for the noninvasive diagnosis of diabetes [2]. In healthy individuals, the acetone content in the respiratory system ranges from 0.3 to 0.9 ppm, whereas individuals with diabetes exhibit acetone concentrations exceeding 1.8 ppm [3]. Among various non-invasive diagnostic techniques, chemical sensors based on semiconductor oxides have gained popularity due to their small size, low power consumption, and ease of manufacture [5–7].
SnO2-based sensors, in particular, have been extensively researched for detecting various gases [8,9], However, achieving high sensitivity and selectivity towards trace amounts of acetone in breath remains a significant challenge. The SILAR method involves a heterogeneous interaction between the solid phase and solvated ions in the solution, creating thin films by alternately immersing the substrate into solutions containing cations and anions, followed by washing after each reaction [10].
In this study, we synthesized Fe-doped SnO2 nanoparticles using the SILAR method to develop a selective acetone gas sensor and investigate its sensing behavior under various conditions. Uniform conditions of 100 ppm gases and 175°C were employed for all gas selectivity assessments, demonstrating the feasibility of using Fe-doped SnO2 as a sensor for detecting volatile organic compounds, particularly acetone. The 0.5 mol.% Fe-doped SnO2 exhibited high response and selectivity to acetone, with a fast recovery time of approximately 20 seconds. These findings suggest that Fe-doped SnO2 sensors synthesized via the SILAR method show high selectivity to acetone vapor in an air atmosphere and rapid recovery time. Thus, doping SnO2 with Fe ions presents a promising approach for developing high-performance gas sensors selective to acetone.
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