fig8

From: Atomically dispersed noble-metal-sensitized semiconductor metal oxides for chemiresistive gas sensing

Figure 8. Enhanced HCHO sensing performance and mechanistic insights of Pt_SA-SnO₂ sensors. (A) Sensor responses of SnO₂ and Pt_SA-SnO₂ as a function of operating temperature; (B) Selectivity profile of 1% Pt_SA-SnO₂ toward various gases across temperatures; (C) Stability and repeatability of 1% Pt_SA-SnO₂ under 5 ppm HCHO at 175 °C; (D) Charge density difference upon HCHO adsorption on SnO₂ and Pt_SA-SnO₂ surfaces; (E) In situ diffuse reflectance infrared Fourier transform spectroscopy spectra. Reproduced with permission from Ref.^[65]. Copyright 2024, John Wiley and Sons. HCHO: Formaldehyde; Pt_SA: atomically dispersed Pt; R_a/R_g: resistance in air/resistance in test gas; RH: relative humidity.