I would say that at 500-600C under air you will get oxidation of the top layers of ZnS-NP. I would propose support treatment and then deposit the nanoparticles.

Another question, are your NP colloidal (with organic ligands)? If yes then, do not care too much about the support because ligands protect them. But at the same time under high T, the ligands will burn.

If your particles are non-colloidal then defenetly you'll have high diffusion between the materials, especially OS exchange, and thus formation of ZnO and FexSy compounds.

Dear Yusuf! Are your particles crystallized in wurtzite phase? Then it shouldn't be transform to

blende phase. But I don't sure about absence of chemical reactions with substrate or ambient atmosphere

Unfortunately ZnS is material that goes through transformation by oxidation at elevated temperatures in atmospheric environment, according to some authors it starts somewhere from 600 degrees C. But you also have to note that iron oxide support can go through transformation if it is not in its most stable form hematite (alpha Fe2O3). And it is possible that through increased diffusion at elevated temperatures and contact of two materials some ZnFe compounds might form.

Regarding ZnS oxidation, I hope the articles in attachment will help you .

http://pubs.acs.org/doi/pdf/10.1021/i100015a001

http://www.sciencedirect.com/science/article/pii/S0038109803009189

Article Thermal Oxidation of ZnS Modifications Sphalerite and Wurtzite

I would say that at 500-600C under air you will get oxidation of the top layers of ZnS-NP. I would propose support treatment and then deposit the nanoparticles.

Another question, are your NP colloidal (with organic ligands)? If yes then, do not care too much about the support because ligands protect them. But at the same time under high T, the ligands will burn.

If your particles are non-colloidal then defenetly you'll have high diffusion between the materials, especially OS exchange, and thus formation of ZnO and FexSy compounds.