Fabrication and characterization of a high-surface area MoS₂@WS₂ heterojunction for the ultra-sensitive NO₂ detection at room temperature

Abstract

Hydrothermally prepared vertical multilayer WS2 nanosheets on the surface of few-layer MoS2 for the ultra-sensitive NO2 detection at room temperature.

Controlled synthesis of ultrathin MoS2nanoflowers for highly enhanced NO2sensing at room temperature

“…20,38,39 In addition, Ikram et al indicated that the high specic surface area not only increases the response of the sensor but also plays an important role in fast response and recovery times. 41 Thus, understanding the detailed mechanism for the complete recovery of the sensor is still under debate because of the combined effects of physi-, chemi-sorption, role of defects sites and transduction mechanism 37 . As shown in Fig.…”

“…† This result can be attributed to the presence of water molecules in the humid ambience, which interact with lattice sites and/or defects on the MoS 2 nano-owers, thereby decreasing the number of active sites for the adsorption of the tested gas. 41,50 The large number of water molecules at high RH ambience results in less active sites and reduced surface area, thereby decreasing the gas response. 41,50 However, the reduction in the response is small because the water molecules on the MoS 2 surface are already abundant at 60% RH.…”

“…41,50 The large number of water molecules at high RH ambience results in less active sites and reduced surface area, thereby decreasing the gas response. 41,50 However, the reduction in the response is small because the water molecules on the MoS 2 surface are already abundant at 60% RH. Thus, further increasing the RH to 90% contributes insignicantly to further decreasing the number of active sites on the MoS 2 nanoowers.…”

Environmental Analysis with 2D Transition-Metal Dichalcogenide-Based Field-Effect Transistors

“…Construction of hybrid structures within TMDC by employing 2D materials or lower dimensional material (e.g., nanowires and nanoparticle) is an effective strategy to improve the TMDC FET performance in gas sensing. Heterostructures of 2D composites include graphene/WS 2 /graphene [ 104 ], MoS 2 /graphene [ 105 ], WS 2 /ZnS 2 [ 106 ], and MoS 2 /WS 2 structures [ 107 ]. The heterostructure promotes sensing performance for oxidizing gas and MoS 2 /WS 2 heterostructure showed a dramatically enhanced sensing performance for NO 2 compared with pristine MoS 2 or WS 2 nanosheet [ 107 ].…”

MoS2 Nanosheets Sensitized with Quantum Dots for Room-Temperature Gas Sensors

“…Recently, MoS 2 -based nanocomposites or hybrids through surface modification with noble metals [11], architecture design of hetero-nanostructures with metal oxide nanoparticles [22,23], and functionalization with other 2D-layered materials such as graphene [24][25][26][27][28] have been demonstrated with improved sensitivity and fast response/ recovery kinetics. Motivated by this strategy, we proposed to improve the room-temperature response and recovery by sensitizing MoS 2 nanosheets with quantum dots (QDs), a highly tunable zero-dimensional (0D) nanomaterial with size-dependent bandgap and excellent solution processability [29][30][31][32][33][34][35].…”