“…Monometallic, bimetallic and multi-metallic nanoparticles are often synthesized through chemical or physical methods [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. However, there are many benefits to using green approaches, such as flexibility, environmental friendliness, cost-effectiveness and protection [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Three key factors to be carefully taken care of in the green synthesis method are the choice of green sources for solvent, reducing agent and stabilizing/capping agent [ 38 , 39 , 40 , 41 , 42 , 43 ].…”