Au-Decorated 1D SnO2 Nanowire/2D WS2 Nanosheet Composite for CO Gas Sensing at Room Temperature in Self-Heating Mode

We have designed a new ternary structure to enhance the sensing properties of WS2 nanosheet (NS)-based gas sensors at room temperature (RT) in self-heating mode. SnO2 nanowires (NWs, 10–30 wt%) were added NSs and then Au nanoparticles (NPs) deposited on surface resulting composites by UV irradiation. The Au-decorated 10 wt% SnO2–WS2 composition showed highest properties. presence NWs effectively enhanced diffusion adsorption species into deeper parts sensor. Furthermore, chemical sensitization (increase oxygen ionosorption; spillover effect catalytic towards CO) contributed an response CO gas. Gas tests performed mode demonstrated possibility realizing low-voltage, low-power-consumption sensor based SnO2–WS2. under 60% relative humidity (RH) conditions was 84% that dry conditions, which shows is possible wet environments operation.