Detection of acetone from amorphous-MoSx/crystalline-MnWO4 heterojunction

Manganese tungstate (MnWO 4 ) is a novel catalytic semiconductor metal oxide with untapped potential for acetone-sensing applications. The construction of amorphous-crystalline heterojunctions shows promising prospects for developing new high-performance gas-sensitive materials. Here, an amorphous-MoS x /crystalline-MnWO 4 composite material was constructed, and the acetone-sensing properties were explored. Due to the abundant surface hanging bonds and defects of amorphous molybdenum sulfide as gas adsorption and reaction sites, the MoS x /MnWO 4 material has a richer surface adsorption oxygen and acetone sensing properties. Combined with carrier regulation effect of the p-n heterojunction, the optimum operating temperature of the MoS x /MnWO 4 composite is reduced (120 °C) and the response towards acetone is improved, reaching a value of 10.54 (100 ppm), which is approximately 4.5 times higher than that of the pure MnWO 4 material. This work is of reference significance for the application of amorphous MoS x in the field of gas sensing and the construction of high-performance acetone sensors.