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TEM images of the cacao-AuNPs S1 (A), S2 (B), S3 (C), S4 (D), and S5 (L). The corresponding histograms showing the particle size distribution (E, F, G, and H for S1, S2, S3, and S4, respectively). Representative SAED patterns of S1 (I), S2 (J), and S3 (K).
