Figure 3From: Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction XPS spectrum of AuNPs synthesized via CO gas reduction. The Au 4f7/2 peak appeared at a binding energy of 83.98 eV and the Au 4f5/2 peak appeared at a binding energy of 87.71 eV. This indicates the formation of metallic gold [27, 28].Back to article page