Heterostructure/Pore-Size Ordered SnO2 Porous Films and Multiphysical Mechanism for Rapid Detection of Ethanol

• Published in: IEEE transactions on instrumentation and measurement Vol. 71; pp. 1 - 9
• Main Authors: Yuan, Zhenyu, Luo, Shan, Zuo, Kaiyuan, Li, Jingfeng, Meng, Fanli
• Format: Journal Article
• Language: English
• Published: New York IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Atmospheric modeling; Colloidal crystals; Density distribution; Ethanol; Gas detectors; Gas-sensing mechanism; heterostructure/pore size; Heterostructures; Morphology; multiphysics field coupling; ordered porous film; Pore size; quick response; Sensitivity; Temperature sensors; Tin dioxide
• DOI: 10.1109/TIM.2022.3193983
• ISSN: 0018-9456

In the work, heterostructure and heteropore size based on SnO 2 are fabricated by the 2-D colloidal crystal template method, and the effects of morphological richness and pore size of ordered porous films on gas-sensitive properties were systematically investigated. The sensor based on ordered porous films possesses excellent fast response, stability, and detection limit down to 1 ppm to ethanol. To explain the sensing mechanism, a novel multiphysics field-coupled analysis method, such as electrical and hydrodynamic, was used to quantify the gas adsorption on the gas-sensitive film surface and the internal current density distribution. The results demonstrate that the simulation can explain the experimental phenomena well.