Abstract:
Nitrogen dioxide (NO2), a hazardous gas with acidic nature, is
continuously being liberated in the atmosphere due to human activity. The NO2
sensors based on traditional materials have limitations of high-temperature
requirements, slow recovery, and performance degradation under harsh environmental conditions. These limitations of traditional materials are forcing the
scientifc community to discover future alternative NO2 sensitive materials.
Molybdenum disulfde (MoS2) has emerged as a potential candidate for developing next-generation NO2 gas sensors. MoS2 has a large surface area for NO2
molecules adsorption with controllable morphologies, facile integration with
other materials and compatibility with internet of things (IoT) devices. The
aim of this review is to provide a detailed overview of the fabrication of MoS2
chemiresistance sensors in terms of devices (resistor and transistor), layer thickness, morphology control, defect tailoring, heterostructure, metal nanoparticle
doping, and through light illumination. Moreover, the experimental and theoretical aspects used in designing MoS2-based NO2 sensors
are also discussed extensively. Finally, the review concludes the challenges and future perspectives to further enhance the gas-sensing
performance of MoS2. Understanding and addressing these issues are expected to yield the development of highly reliable and industry
standard chemiresistance NO2 gas sensors for environmental monitoring.
