Rational Design of Nanoporous MoS₂/VS₂ Heteroarchitecture for Ultrahigh Performance Ammonia Sensors

Abstract

2D transition metal dichalcogenides (TMDs) have received widespread interest by virtue of their excellent electrical, optical, and electrochemical characteristics. Recent studies on TMDs have revealed their versatile utilization as electrocatalysts, supercapacitors, battery materials, and sensors, etc. In this study, MoS2 nanosheets are successfully assembled on the porous VS2 (P‐VS2) scaffold to form a MoS2/VS2 heterostructure. Their gas‐sensing features, such as sensitivity and selectivity, are investigated by using a quartz crystal microbalance (QCM) technique. The QCM results and density functional theory (DFT) calculations reveal the impressive affinity of the MoS2/VS2 heterostructure sensor toward ammonia with a higher adsorption uptake than the pristine MoS2 or P‐VS2 sensor. Furthermore, the adsorption kinetics of the MoS2/VS2 heterostructure sensor toward ammonia follow the pseudo‐first‐order kinetics model. The excellent sensing features of the MoS2/VS2 heterostructure render it attractive for high‐performance ammonia sensors in diverse applications.

Structure, Preparation, and Applications of 2D Material‐Based Metal–Semiconductor Heterostructures

“…Finally, in addition to the applications mentioned in Section 4, more applications need to be explored based on the intriguing coupling between metals and semiconductors in MSHSs. For example, some pioneering studies have shown the suitability of 2D material-based MSHSs in the sensing of gases, [224][225] organics, [226] and DNA. [227] In addition, the ultrafast excitonic behavior in MSHSs could broaden the applications of 2D materials in optoelectronic devices, [208] and the unique spintronic states in Fe3GeTe2-based MSHSs will be used in future magnetic storage applications.…”

Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

“…Zhang et al 191 VS 2 exhibits a high adsorption uptake of Df ¼ 344.5 Hz toward 5 ppm NH 3 , which is much better than that of previously reported QCM NH 3 sensors. 193 Other p-n heterojunction gas sensors, for instance, 2D WS 2 NSs decorated with TiO 2 QDs, were proved to have a high response to NH 3 gas at room temperature. 194 Xu et al 117 and Leonardi et al 195 203 The recommended concentration of NO for healthy people is below 25 ppb; when it is higher than 50 ppb, it is perhaps a sign of airway inammation.…”

High‐Performance Broadband Photodetectors of Heterogeneous 2D Inorganic Molecular Sb2O3/Monolayer MoS2 Crystals Grown via Chemical Vapor Deposition

“…2D materials, such as graphene and transition metal dichalcogenides (TMDCs), have attracted incredible interest because of their extraordinary properties that make them promising candidates for next generation electronic and optoelectronic applications. [ 1–10 ] In contrast to graphene, TMDCs are semiconducting materials with layer‐dependent bandgap in the range of 1−2 eV, [ 11,12 ] exhibiting rich novel fundamental physical properties and promising applications in electronics and optoelectronics. [ 13–16 ] In spite of the attractive photoresponse performances, most of photodetectors based on TMDCs only show photoresponse in visible range, [ 17–19 ] which seriously hinder their real applications.…”