MoS2 with Different Morphologies: Preparation and Gas-sensing Property of NH3

Ammonia leak is one of the key factors for air pollution, which may cause acute edema, respiratory failure and other diseases harmful to human health. Nowadays, the development of high-performance ammonia sensors has become one of the important means of real-time monitoring and safety warning of ammonia. In this work, three types of molybdenum disulfide with different morphologies of nanoflower, nanosphere and nanosheet were prepared by the hydrothermal method, and three types of MoS2 ammonia sensors were constructed. The results of gas-sensing experiments showed that among these MoS2 ammonia sensors with different morphologies, the NH3 gas sensor made of nanoflowers MoS2 performed the best performance with a high response value of 7.41% to 10x10(-6) NH3, while those of the nanosheets MoS2 and nanospheres MoS2 sensors under the same NH3 concentration were 2.01% and 5.11%, respectively. In addition, the nanoflowers MoS2 sensor also exhibited excellent repeatability, stability and selectivity. The reason for the superior response performance of the nanoflower MoS2 ammonia sensor is mainly due to the larger surface area, which could provide more active sites for the adsorption of ammonia. This study demonstrates an effective way to prepare high-performance NH3 sensors with using MoS2 as the substrate material.