Fig. 3

Raman spectra of xanthan gum, pigment-xanthan, silver nanoparticles (Ag), pigment-xanthan-Ag, Graphene oxide (GO) pigment-xanthan-GO, silver-graphene (Ag/GO) and pigment-xanthan Ag/GO. Black arrows indicate the shifted peaks and newly appeared bands resulting from interaction between the components.