I've searched and done some experiment in copper nanostructures synthesis by solution method. The biggest problem is how to prevent oxidation as soon as the nanoparticles is synthesized. Most of the researchers use excessive capping agent contain thiol or amine group to bind the surface atom completely in order to prevent oxidation. The problem is these capping agent will limit the nanoparticles application in microelectronics as these capping agent will form insulative layer around the particles
Is there other method to prevent oxidation of nanoparticles? Or any post-synthesis treatment to prevent further oxidation?
Commercial manufacturers often dry out copper nanoparticle suspensions to arrest oxidation so I would recommend freeze-drying. Nano-Fe0 is often stored in ethanol at 4 degree to reduce (not eradicate) oxidation so maybe you can also try that out for your copper nanoparticles. But please check to make sure they are not reactive in that condition.
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