Co,N-doped GQDs/SnO2 mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H2S gas detection

The optimal sensor (Co,N-GQDs/SnO 2 ) response value toward 100 ppm H 2 S is 37.3 at 260 °C, which has superior sensing performance. This can be attributed to the increase of active sites on the surface and the electrical modulation of Co,N-GQDs.