Recent Advances in Functionalization and Hybridization of Two‐Dimensional Transition Metal Dichalcogenide for Gas Sensor

Abstract

Two‐dimensional (2D) transition metal dichalcogenides (TMDs) have garnered significant attention in gas‐sensing applications due to their sensitive response to a wide range of gas molecules and their ability to operate at low temperatures, resulting in low‐power consumption. However, there are several areas that require improvement, including insufficient sensitivity at low detection limits, limited gas selectivity, low reliability, and poor recovery. To address these issues and enhance the performance of gas sensors, researchers have proposed the functionalization and hybridization of 2D TMDs. This review paper focuses on elucidating the synergistic effects of functionalization and hybridization of 2D TMDs with carbon‐related materials, metals, MOs, and metal chalcogenides. The paper presents an in‐depth analysis of the mechanisms involved in enhancing the performance of 2D TMD gas sensors and explores various synthesis methods for achieving functionalization and hybridization. Furthermore, the challenges currently faced in the field are discussed and offer insights into the future prospects of TMD nanocomposite‐based gas sensors. By comprehensively addressing these aspects, this research aims to contribute to the advancement of gas‐sensing technology using TMD nanocomposites.

Direct or Indirect Sonication in Ecofriendly MoS2 Dispersion for NO2 and NH3 Gas-Sensing Applications

“…Donarelli et al reported 2220 s/1860 s at 150 °C, 1 ppm of NO 2 . To optimize the gas sensor performance by reducing exposure and recovery time, heterostructures, hybridization, and functionalization can be explored . Liu et al reported a 276 s recovery time in MoS 2 /ZnS heterostructure compared to over 4800 s in pure MoS 2 at 25 °C, 5 ppm of NO 2 .…”

“…To optimize the gas sensor performance by reducing exposure and recovery time, heterostructures, hybridization, and functionalization can be explored. 43 Liu et al 44 reported a 276 s recovery time in MoS 2 /ZnS heterostructure compared to over 4800 s in pure MoS 2 at 25 °C, 5 ppm of NO 2 . Han et al 45 reported a 74 s response time in MoS 2 /SnO 2 heterostructures instead of 165 s in pure MoS 2 at room temperature, 5 ppm of NO2.…”

“…To optimize the gas sensor performance by reducing exposure and recovery time, heterostructures, hybridization, and functionalization can be explored. 43 Liu et al 44 Furthermore, it was demonstrated that the incorporation of carbon dots improved the MoS 2 response time of the humidity sensor. 46 Figure S2e,f represents the response and recovery times of MoS 2 bath sonication (B-MoS 2 ) and probe sonication (P- MoS 2 ) when exposed to 800 ppb of NO 2 gas and 10 ppm of NH 3 gas at three different temperatures.…”

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

“…While commercially available devices are by far less diffuse than in the case of MOX, these systems can provide a manifold of functionalization/doping/decoration strategies to tailor their response to target gas molecules in view of specific applications. Finally, we present chemiresistors based on TMDs [ 21 , 22 , 23 ] as an emerging class of materials that display interesting properties in the field of gas sensing. For each sensor, we report the material of the active layer, the sensitivity, the working temperature, and the response and recovery times.…”

Functionalized hexagonal boron nitride bilayers: desirable electro-optical properties for optoelectronic applications

“…In fact, chemical functionalization is an important way to acquire new properties and extend the applications of 2D materials. 23–28 Encouraged by the successful preparation of few-layer and monolayer h-BN, in this work, the functionalized AB-stacking h-BN bilayers were systematically investigated employing first-principles calculations, and the stability and electronic and optical properties were discussed in details. The calculations reveal that hydrogenation and hydrofluorination can significantly improve the electronic and optical properties of the AB-stacking h-BN bilayer by inducing the interfacial B–N sp 3 bonding.…”