TY - JOUR
T1 - MOF-derived Co3O4/ZnSnO3 hollow composite gas sensor with superior response and selectivity toward ethanol
AU - Yu, Shouwen
AU - Zhang, Junxuan
AU - Xie, Wanfeng
AU - Yang, Woochul
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2026/3/1
Y1 - 2026/3/1
N2 - Ethanol is widely used in the chemical and food industries, and its accurate and efficient detection is essential for safety and process control. In this study, ZnSnO₃ hollow microspheres decorated with MOF-derived Co₃O₄ hollow polyhedrons were synthesized via co-precipitation and calcination method. The structure, morphology, surface chemistry, and ethanol-sensing properties of the Co₃O₄/ZnSnO₃ composites were systematically investigated. Compared with pure ZnSnO₃, the composites exhibited significantly increased specific surface area and oxygen vacancy concentration, leading to superior gas-sensing performance. The optimized CZSO-2 composite (15 % Co3O4) sensor achieved a high response of 160.6 toward 100 ppm ethanol at 240°C, with rapid response/recovery times of 6/56 s and a low detection limit of 0.21 ppm. Furthermore, the composites demonstrated enhanced selectivity, repeatability, and long-term stability. Mechanistic analysis revealed that the synergistic effects of abundant oxygen vacancies, the large specific area arising from the hollow structure, and the formation of p-n heterojunction between Co₃O₄ and ZnSnO₃ were responsible for the improved performance. Therefore, the MOF-derived Co₃O₄/ZnSnO₃ hollow composites present a promising sensing material for high-performance ethanol detection.
AB - Ethanol is widely used in the chemical and food industries, and its accurate and efficient detection is essential for safety and process control. In this study, ZnSnO₃ hollow microspheres decorated with MOF-derived Co₃O₄ hollow polyhedrons were synthesized via co-precipitation and calcination method. The structure, morphology, surface chemistry, and ethanol-sensing properties of the Co₃O₄/ZnSnO₃ composites were systematically investigated. Compared with pure ZnSnO₃, the composites exhibited significantly increased specific surface area and oxygen vacancy concentration, leading to superior gas-sensing performance. The optimized CZSO-2 composite (15 % Co3O4) sensor achieved a high response of 160.6 toward 100 ppm ethanol at 240°C, with rapid response/recovery times of 6/56 s and a low detection limit of 0.21 ppm. Furthermore, the composites demonstrated enhanced selectivity, repeatability, and long-term stability. Mechanistic analysis revealed that the synergistic effects of abundant oxygen vacancies, the large specific area arising from the hollow structure, and the formation of p-n heterojunction between Co₃O₄ and ZnSnO₃ were responsible for the improved performance. Therefore, the MOF-derived Co₃O₄/ZnSnO₃ hollow composites present a promising sensing material for high-performance ethanol detection.
KW - CoO/ZnSnO
KW - Ethanol
KW - Gas sensor
KW - Metal-organic frameworks
KW - P-n heterojunction
UR - https://www.scopus.com/pages/publications/105024321825
U2 - 10.1016/j.snb.2025.139306
DO - 10.1016/j.snb.2025.139306
M3 - Article
AN - SCOPUS:105024321825
SN - 0925-4005
VL - 450
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
M1 - 139306
ER -