In the current investigation, nanosheets of molybdenum disulfide (MoS2) have been synthesized for room-temperature detection of ammonia (NH3). MoS2 nanosheets were successfully fabricated using liquid-phase exfoliation, and characterized using SEM, XRD, FTIR, AFM, and Raman spectroscopy. This chemiresistor gas sensor of pristine MoS2 was subjected to a plethora of gases, including NO2, NH3, SO2, and N2O, at two concentration levels (27 and 100 ppm). The MoS2 sensor preferentially detected NH3 at room temperature while exhibiting p-type semiconducting behavior. It is interesting to note that the MoS2 chemiresistive sensor exhibited decent sensitivity of ∼73, coupled with a response time of ∼74 s and a recovery time of ∼54 s, respectively, for the detection of 27 ppm NH3.
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