“…The C 1 s peaks of SA at the binding energy of 284.8, 285.8, 287.2, and 288.4 eV are attributed to C−C, C−O, C�O, and O−C�O bonds individually (Figure 3e). From Figure 3f, the C 1 s peaks of GP-20/SA-MF related at 284.8, 286.1, 287.6, 288.8, and 290 eV correspond to C−C, C�C, C−O, C�O, and O−C�O bonds, respectively 47. The same chemical bonds as MF and SA appear in GP-20/SA-MF, while the XPS peak of C�C bond appears due to the addition of GP.…”