Strategy and Future Prospects to Develop Room-Temperature-Recoverable NO2 Gas Sensor Based on Two-Dimensional Molybdenum Disulfide

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 scientific community to discover future alternative NO2 sensitive materials. Molybdenum disulfide (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.

Applications of 2D-Layered Palladium Diselenide and Its van der Waals Heterostructures in Electronics and Optoelectronics

“…The Pd metal has a fully occupied d orbital with electron configuration of [Kr]4d 10 . And the Se is a p-block element, with an electron configuration of [Ar]3d 10 4s 2 4p 4 . In a single-layer PdSe 2 , one Pd atom is coordinated to four Se atoms, forming a square-planar structure [31].…”

“…These 2D materials have been widely employed in biomedical engineering [3], electronics and optoelectronics, photonics, optics, and related devices. Besides, 2D materials have boosted the field of smart sensing such as gas sensors [4].…”

“…These 2D materials have been widely employed in biomedical engineering [ 3 ], electronics and optoelectronics, photonics, optics, and related devices. Besides, 2D materials have boosted the field of smart sensing such as gas sensors [ 4 ]. They exhibit significant potential in devices such as photodetectors and photovoltaic cells; this is attributed to their distinct resonance absorption in the visible to near-infrared spectrum.…”

Short Review on the Conducting Polymer based Nanocomposites for Gas Sensing Applications

“…Despite scientific advancement in the field of gas sensors there are some areas in which researchers are facing challenges some of them are the selectivity for a target gas, in depth understanding of response time and the mechanism of sensitivity. So, in future we will see that much more attention will be given for the development of flexible and wearable sensor devices developed through the advanced synthesis methods to improve dispersion and to get uniform properties of the nanocomposites [8,9].…”

A DFT study of NO2 and SO2 gas-sensing properties of InX (X = Cl, Br and I) monolayers

“…NO 2 and SO 2 gases are typical air pollutants, which can weaken our respiratory system and result in serious human diseases. Therefore, it is urgent to develop gas sensors with high sensitivity and selectivity for real-time alarming NO 2 and SO 2 in the surrounding environment[24,25]. A theoretical study predicted that C 3 N monolayer has good selectivity for NO2 or SO 2 adsorptions in mixed gases of NO 2 , SO 2 , NH 3 , H 2 S, CO, CO 2 , NO, CH 4 , HCN, N 2 , H 2 , and O 2 [26].…”