The detection of ethanol vapors based on a p-type gas sensor fabricated from heterojunction MoS2–NiCo2O4

In this paper, the hydrothermally synthesized nanocomposites (MoS2–NiCo2O4) were exploited to detect various volatile organic compounds (VOCs). Some characterizations such as XRD, Raman, N2 adsorption-desorption isotherms, SEM, EDS and XPS were explored to identify the structure and morphology of these materials. More importantly, different sensors were designed from synthesized nanocomposites to see their sensing performance to various VOCs. Among these sensors, the sensor of MNCO-6 (6 mL MoS2 decorated with NiCo2O4) detected the highest response to 100 ppm ethanol while an insignificant response to other VOCs was noticed; moreover, good repeatability and response/recovery time (15/6 s), the response (1.63) to 0.1 ppm ethanol was also distinguished.