Highly Dispersed Pt-Incorporated Mesoporous Fe2O3 for Low-Level Sensing of Formaldehyde Gas

Highly dispersed Pt-incorporated mesoporous Fe2O3 (Pt/m-Fe2O3) of 4 mu m size is prepared through a simple hydrothermal reaction and thermal decomposition procedures. Furthermore, the formaldehyde gas-sensing properties of Pt/m-Fe2O3 are investigated. Compared with our previous mesoporous Fe2O3-based gas sensors, a gas sensor based on 0.2% Pt/m-Fe2O3 shows improved gas response by over 90% in detecting low-level formaldehyde gas at 50 ppb concentration, an enhanced selectivity of formaldehyde gas, and a lower degradation of sensing performance in high-humidity environments. Additionally, the gas sensor exhibits similar properties as the previous sensor, such as operating temperature (275 degrees C) and long-term stability. The enhancement in formaldehyde gas-sensing performance is attributed to the attractive catalytic chemical sensitization of highly dispersed Pt nanoparticles in the mesoporous Fe2O3 microcube architecture.

Automated summary

Highly dispersed Pt-incorporated mesoporous Fe2O3 (Pt/m-Fe2O3) particles of 4 μm size were prepared through a simple hydrothermal reaction and thermal decomposition procedures. The gas-sensing properties of Pt/m-Fe2O3 towards formaldehyde were studied. Compared to previous mesoporous Fe2O3-based gas sensors, a sensor based on 0.2% Pt/m-Fe2O3 showed improved gas response, enhanced selectivity, and lower degradation in high-humidity environments when detecting low-level formaldehyde gas at 50 ppb concentration. The enhancement in formaldehyde gas-sensing performance is attributed to the catalytic chemical sensitization of highly dispersed Pt nanoparticles in the mesoporous Fe2O3 microcube architecture.