Iron Oxide and Carbon Thread Integrated Flower Garland-like Acetone Gas Sensor

The hydrothermal method has been successfully employed to grow flower garland-like morphologies of sheet and rod-assembled Fe 2 O 3 on a carbon thread (CT), utilizing Fe[Formula: see text] solution as a precursor. The produced materials underwent characterization through scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). Subsequently, these Fe 2 O 3 garlands were utilized in the construction of gas sensors, which were then tested with various common gases. Operating at room temperature, the sensors exhibited an optimal response value of 50–100[Formula: see text]ppm acetone. Notably, the Fe 2 O 3 garland sensors demonstrated remarkably rapid response and recovery times, measured at 9[Formula: see text]s and 12[Formula: see text]s, respectively. The three-dimensional (3D) porous structure and high surface area were identified as crucial components of the underlying sensing mechanism.