You can add a drop of hydrizine to your solution mixture

You can add a drop of hydrizine to your solution mixture

See

https://www.degruyter.com/view/j/gps.ahead-of-print/gps-2018-0038/gps-2018-0038.xml?format=INT&intcmp=trendmd

Just change the reducing agent and optimize the conditions.

Thank you Mr. Muhammad Ismail, does hydrizine works as a catalyst for reduction? Basically i did't try to use any catalyst for reduction because, as I was expecting green synthesized copper oxide nano particles reduced by just plant extract (as it already had phenol and antioxidant). My aim was to produce green synthesized copper oxide nano particles from copper acetate monohydrate with out the intervention of any other chemicals or catalyst. Finally i did by increasing the concentration of plant extract step by step.