Active edge effect of pothole-rich WO3 nanosheets for enhancing dimethyl trisulfide gas sensing performance

The gas sensing mechanism of metal oxides has always been the research focus in the field of gas sensors. Herein, a novel gas sensing mechanism based on the active edge effect was proposed to account for the difference in gas sensing performance between pothole-rich WO 3 and non-porous WO 3 nanosheets . The gas sensor based on pothole-rich WO 3 exhibited a higher response (9.5) than non-porous WO 3 (6.8) when exposed to 500 ppb C 2 H 6 S 3 , which could be ascribed to the active edge sites on the pothole-rich WO 3 nanosheets. DFT calculations and XPS confirmed that the edge sites showed higher adsorption energy and more charge transfer for C 2 H 6 S 3 gas, and W-S bond was formed at the edge site due to the strong chemical adsorption .