Figure 4
(a,b) TEM images and (c,d) Dark Field Scanning Transmission Electron Microscopy (DF-STEM) images showing the presence of small Au nanoparticles (5.4 ± 1.4 nm for long axis and 3.7 ± 0.9 nm for short axis) embedded in polymer matrix and some large particles located on the surface. The TEM images were recorded in bright field, where species with high atomic number appear as dark features. The DF-STEM images were recorded in dark field, where species in high atomic contract appear as bright features. The analysed sample was prepared using Formulation 15 (PETA-20% Au-1.5% DETC).
