Dear all,
I want to understand how does the layered metal sulfides form. For ex. MoS2, WS2. They are known to have layered structure. Why there should be Van der Waals force of attraction after each monolayer (Atomically thin). Why not the covalent bond continues to form with the next layers?
Thanks in advance...
This is an interesting question! I think it deals with the core of the materials science.
My answer to your question is that the layered structure with Van der Waals force is more thermodynamically stable at the synthesis conditions than the bulk structure with covalent bonds. There are many other nonlayered crystal structures consisting of Mo and S atoms, such as Mo2S3, Mo3S4.
If you look into the details, it can go very complicated. There are some theory and software which can help you to understand such as DFT calculation.
I hope this can help you!
Best regards,
Huiyu
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