(A) UV-VIS spectra for NG (line), NG-Ag2 (open triangles), NG-Ag5 (closed squares), NG-Ag10 (crosses) and NG-Ag25 (closed circles). The inset shows pictures of the hybrid NG (left to right): NG, NG-Ag2, NG-Ag5, NG-Ag10 and NG-Ag25 (B) Hydrodynamic diameter for NG (line), NG-Ag2 (open circles) and (C) AFM 3D topography image of NG-Ag2.