Hi Saied Saeid Saei dehkordi,

If you are talking about Metal-organic framework analysis then TEM as it differentiates phase by density gradient. Law density (Organic) bright, high density (metal) dark.

Hello Saied Saeid Saei dehkordi,

your question is - let's say - unsharp.

You should define what's your aim. What information is needed?

For application of TEM to metal-organic framework analysis, see here as a starter:

https://pubs.rsc.org/en/content/articlelanding/2017/ta/c7ta00194k

In your question you say SEM or TEM for MOF identification. Do you want to identify what? Grain sizes? Crystallite sizes? The crystal phase? In this last case you need to use electronic diffraction of TEM (from SAED) or HR-TEM...

Thank you so much, dear colleagues