Ultra-high selective hydrogen peroxide vapor sensor based on the Fe 2 O 3 /MWCNTs nanocomposite

Considering the broad range of applications of hydrogen peroxide (H2O2), the present study focuses on the preparation and investigation of the hydrogen peroxide vapor (HPV) sensor. The flexible sensor based on an iron oxide/multi-walled carbon nanotubes nanocomposite (Fe2O3/MWCNTs) was fabricated using the radio frequency (RF) magnetron sputtering technique. To characterize the properties of the sensor, the nanocomposite material was comprehensively analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FTIR). The gas-sensing parameters of the sensor were examined under ultraviolet (UV) irradiation at various temperatures and concentrations of HPV. The Fe2O3/MWCNTs sensor exhibited the best sensing performance at an operating temperature of 100°C, with a detection limit of 1 ppm of HPV (S = 1.52 response). The prepared sensor demonstrated excellent selectivity, showing no response to any other tested gases at the operating temperature.