On the behavior of MoS2-rGO nanocomposites for chemiresistive H2S detection at room temperature

The detection of hydrogen sulfide (H2S) gas is urgently necessitated as one of the extremely hazardous, colorless contaminants for the environment and human health. Hence, an active material that can sense H2S gas at room temperature (28 degrees C) must be desired. Ornamentation of metal dichalcogenides such as MoS2 nanoparticles (NPs) on the reduced graphene oxide (rGO) sheets to improve substantial functionalization, characteristics, and sensing capacities of materials has fascinated growing interests among researchers. Herein, introduced simple hydrothermal route, without utilizing reducing agents and surfactants, to decorate MoS2 NPs on rGO sheets for enhancing the performance of H2S detection. This is the first time an approach has been taken to investigate the H2S sensing performance of MoS2-rGO (MR) nanocomposite sensor. The influence of rGO weight % (wt%) variation in MR nanocomposites on H2S sensing performance was also investigated. Results were confirmed that MoS2-rGO (3 wt%) nanocomposite sensor has delivered outstanding sensing performance towards H2S at 28 degrees C. It has exhibited maximum response (49.34 % to 100 ppm H2S), speedy response/recovery character (0.85/12.08 s to 1 ppm H2S), excellent reproducibility, and admirable stability (88.79 %). The possible H2S sensing mechanism of MR nanocomposite sensor has studied by gas chromatography (GC) and impedance spectroscopy.

Automated summary

This study utilizes a simple hydrothermal method to decorate MoS2 nanoparticles on rGO sheets, improving the H2S gas detection performance. The results show that the MoS2-rGO (3 wt%) nanocomposite sensor exhibits outstanding sensing performance towards H2S gas at 28 degrees C.