The formation of single layers of FGO and the deposition of Ag- NPs on its surface was confirmed by the FESEM and TEM studies. The FESEM (Fig. 3A) and TEM (Fig. S2) images indicate the forma- tion of single layer FGO with size greater than 1 lm. Fig. 3 displays FESEM images of the FGO/Ag nanocomposites at different pHs. Even though the concentrations of silver nitrate and FGO were kept constant in all samples, the Ag-NPs show different morphologies with the variation in the pH, suggesting an effect of pH on forma- tion of the Ag-NPs. The average size of the NPs calculated from the FESEM and TEM images are in good agreement with each other and are presented in Table 1. The sizes of the Ag-NPs decreased from