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SEM images of different regions of Au–PMMA nanocomposites. (a–c) Low Mw PMMA with 20 wt % Au salt (P1-20); (d,e) high Mw PMMA with 20 wt % Au salt (P2-20), (f,g) low Mw PMMA with 60 wt % Au salt concentration (P1-60) and (h–k) high Mw PMMA with 60 wt % Au salt concentration (P2-60).
