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Transmission electron microphotographs of AuNPs at pH 4.7 (A), 5.0 (B), and 5.3 (C), and commercial AuNPs (pH 5.0) with an average diameter of 16.42 ± 1.76 nm (D). Histograms with the respective particle size distributions and the percentage of spherical nanoparticles are included as insets within each microphotography.
