Green and rapid synthesis of 3D Fe2(MoO4)3 by microwave irradiation to detect H2S gas

•We used the rapid and environmental microwave irradiation method.•The different Fe2(MoO4)3 morphologies were synthesized with diverse solvents.•We investigated the 3D FIMMS1 growth process by changing reaction time.•The sensing property of the 3D FIMMS sensor was better than the 0D IMNP2 sensor.

A three-dimensional flower-shaped iron molybdate microsphere (3D-FIMMS) and a zero-dimensional iron molybdate nanoparticle (0D-IMNP) were successfully synthesized by a rapid and environment friendly microwave irradiation method. The 3D-FIMMS crystal growth was investigated by changing the microwave heating time. The gas sensing performances of various morphologies of iron molybdate were studied. The results showed that 3D-FIMMS sensors exhibited excellent gas sensing properties compared with the 0D-IMNP sensors, in which response value reached 13.5 for 50 ppm H2S gas. Meanwhile, the 3D-FIMMS sensors displayed high selectivity to H2S. The experimental results indicated an efficient and eco-friendly approach to realize promising sensing performance to H2S gas.