Hydrothermal synthesis of a bimetallic metal-organic framework (MOF)-derived Co 3 O 4 /SnO 2 composite as an effective material for ethanol detection.

This study utilized a hydrothermal method and air calcination to prepare a bimetallic metal-organic framework (MOF) derived Co 3 O 4 /SnO 2 nanocomposite material, which was employed as a sensing material for ethanol detection. The structure, elemental composition, and surface morphology of Co 3 O 4 /SnO 2 nanocomposite materials were defined using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Compared to SnO 2 nanoparticles derived from metal-organic frameworks, the bimetallic metal-organic framework-derived Co 3 O 4 /SnO 2 nanocomposite material exhibits significantly superior ethanol sensing performance. At 225 °C, the response value ( R = R a / R g ) to 100 ppm ethanol is 135, demonstrating excellent repeatability, selectivity and stability. Gas sensitivity assessment findings indicate that the 3 at% (Co/Sn) Co 3 O 4 /SnO 2 nanocomposite is an excellent gas sensing material, providing strong technical support for ethanol detection and environmental monitoring.