Abstract
In recent years, two-dimensional (2D) transition metal dichalcogenides (TMDs), such as MoS2, MoTe2, WS2, etc., have gained significant interest in sensing applications, especially in field of room-temperature gas sensor, owing to their fascinating electronic, optical and mechanical properties. Van der Waals (vdW) junctions are widely used in electronic and optoelectronic devices due to the intrigue properties at the heterointerface, highly gate-tunable bandgap and fast carrier transportation. However, the capacity of vdW junctions in gas sensors has not been fully touched and a comprehensive review is still missing in this field. Herein, the design and application of vdW junctions based on W and Mo-TMDs materials for gas sensors are comprehensively overviewed. Then, the common methods of constructing 0D/2D, 1D/2D, 2D/2D and 2D/3D vdW heterojunction with 2D TMDs materials as the conductive layers are introduced in detail. Later, the most recent advances of vdW junctions in the chemical gas sensor applications are summarized. Finally, the challenges and perspectives of vdW junctions for the development of next generation gas sensors are discussed, which can be used to guide the architecture design of sensor components and promote its practical applications.
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