Selective Vertical and Horizontal Growth of 2D WS ₂ Revealed by In Situ Thermolysis using Transmission Electron Microscopy

Direct observation of the growth dynamics 2D transition metal dichalcogenides (TMDs) is key importance for understanding and controlling modes tailoring these intriguing materials to desired orientations layer thicknesses. Here, various stages multiple in formation WS2 layers on different substrates through thermolysis a single solid-state (NH4)2WS4 precursor are revealed using situ transmission electron microscopy. Control over vertical horizontal achieved by varying thickness drop-casted from which grown during heating. First depositing platinum (Pt) gold (Au) heating chips much enhance process resulting an increased length self-limited layers. Interference patterns formed mutual rotation two angles deposited chips. This shows detailed insights into as function temperature, thereby establishing control orientation size. These findings also unveil important role evolution structures, offering general effective pathways nano-engineering TMDs variety applications.