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SEM images showing (A) bare ZnO tetrapods (B–D), Au nanoparticles synthesized on ZnO tetrapods from 1 mM HAuCl4 (E), Au nanoparticles synthesized on ZnO tetrapod from 0.5 mM HAuCl4 (F), histograms showing the Au nanoparticle size distribution derived from 1 mM (blue) and 0.5 mM (red) HAuCl4. (G) XRD data showing the Au and ZnO reflections.
