How can I ensure that only Zn nanoparticles are synthesized via green synthesis and avoid the formation of ZnO nanoparticles?
Fa Ma
When reducing zinc ions with a reducing agent contained in the plant extract, pass inert gas such as nitrogen or argon through the reactor. Then the resulting zinc nanoparticles will not turn into zinc oxide nanoparticles.
Given the strongly reductive nature of pure Zn, I am sure that at least the top layer of the nanoparticle contains Zn(II). Moreover, I would expect that in most applications, the particle will quickly and completely oxidize.
Besides, how does one reduce Zn(II) in a "green" way? Which reducing agent is "green"?
Green synthesis of zinc nanoparticles typically results in ZnO formation due to zinc's oxidation in aqueous, oxygenated conditions. To obtain pure metallic Zn nanoparticles, strict inert atmosphere, strong reducing agents, controlled pH, and low-temperature processing are essential to prevent ZnO formation.