Eduardo Cueto Diaz I suspect you'll have to synthesize this yourself. There are plenty of 'recipes' in papers on the Internet.

Dear Alan,

Thank you for your answer.

Yes, I guess I will have to deal it by myself. Autoclave, iron acetate (II), oleylamine, and sulfur. It seems to be kinda "easy"

Eduardo Cueto Diaz Be aware that you'll need to keep the particles in suspension to keep them 'nano'. Also if you drop the pH into the acidic range then you'll get H2S generation. This webinar may be helpful as a general primer:

May 28th, 2019 Dispersion and nanotechnology

https://www.brainshark.com/malvern/vu?pi=zHSznNgprz5chz0

That's very helpful. Thanks a lot

I am following a protocol I found in the Materials Letters, 161(2015)220–223.

It will be challenging as I am working in an astrobiology environment.

Thank you again