Dear zeinab,

This is tricky, but you can spread the powder on a glass and use regular metallography epoxy to glue it. After curing you can slightly grind the powder on very fine SiC paper. Then coat it with thin film of carbon and take it to SEM with either WDS or EDS an use line scan mode. With these methods you can detect the boundary of copper on si3n4. Good luck.

Dear Ori,

Thank you very much for your reply.

Dear Zeinab Malekshahi,

TEM imaging is commonly used for tha analysis of core-shell nanoparticles to determine the geometric properties.

https://materials.springer.com/lb/docs/sm_smf_978-3-642-38934-4_6

I think you will find this question on RGate helpful.

https://www.researchgate.net/post/How_can_I_recognize_coreshell_structure_in_TEM_images

Good luck in your research.

Ali

thank you for your response

which center or lab you recommend me to get TEM image?

You can get a list of TEM operators at:

http://www.labsnet.ir

Make sure to get the image file in a lossless format (for example .tiff). Also, check with the technician for any sample preperation requirements.

Good luck on the characterisation of your nanoparticle.