Thank you for your answer. We know our resulting material consists of Al and Cu nanoparticles as well as oxygen. But our question related to their configuration. Our expectation was some thing like core-shell configuration. But TEM shows a uniform structure, something like an alloy. 

I appropriate your pursue about my question. We did the generation of Al and Cu nanoparticle before the mentioned process. the resulting materials were spherical nanoparticle for both elements. I must tell here our colleges (Dr. Parvin and Dr. Mortazavi) the core-shell structure by mentioned process for other materials. But our goal was not merely core-shell structure generation. We did that process to investigate what kind of structure would be fabricated. My question exactly is what is the structure of the fabricated material? your suggestion was composite of nanoparticles. I will be grateful if you give me more explanation. 

It is very difficult to identify the nature of your material from TEM only some additional characterization is required. It is better to do TEM-EDX or EELS or SAED. For simplicity you can run XRD first to get an idea about the composition of the product. Good luck

Dear Niusha

Thank you for your comments. Unfortunately, we work in a  poor facilities university. I defined my project based on the instruments which are not in our hands. My plan included SAEED as well as XRD but the instrument of Tehran university was not calibrate and we could not do any thing. My students spent all of the samples for other characterization  approach such as FTIR, DLS,... and the repetition of the experiments is not possible ( because the lack of finance supports) So I try to collect the different ideas about the results to derive the best description on our results.

Best regards  

Dear Niusha, Thank you for your email. I appreciate your favor. I wish the best for you.