fig6

Figure 6. (A) Schematic diagram of microwave plasma phase modulation; (B) TEM images of 1T/2H mixed-phase structured WSe₂ nanosheets; (C) Relationship curve between 2H phase content in WSe₂ nanosheets and processing time, as well as device response to 1 ppm NO₂^[86]. Copyright 2023, Elsevier; (D) Schematic diagram of 1T/2H 3D-hierarchical WSe₂ nanoscrews gas sensor structure and response mechanism; (E) Response curves of a gas sensor based on 3D-hierarchical WSe₂ nanospiral and planar films for 1 ppm NO. The inset shows the photograph of the sensing device^[88]. Copyright 2019, The Royal Society of Chemistry; (F) Response of 3D-hierarchical WSe₂ nanospiral (left axis) and ratio of 1T to 2H phase (right axis) curves as a function of synthesis temperature; (G) Schematic of 1T/2H mixed-phase structure MoS₂ FET; (H) Curve of annealing temperature vs. the content of 1T and 2H phases of MoS₂; (I) The response curves of MoS₂ with different annealing temperatures to the relative current of NO₂ gas^[89]. Copyright 2020, ACS Publications. TEM: Transmission electron microscopy; 3D: three-dimensional; FET: field effect transistor.