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Characterization of gallic acid and gold nanoparticles. (a) Chemical structure of gallic acid. (b) pH values of gallic acid solutions with different concentrations (0, 100, 200, and 300 μg/ml). (c) The morphology of gold nanoparticles was detected by transmission electron microscope. Left panel: low‐magnification image (scale bar = 80 nm). Right panel: high‐magnification image (scale bar = 20 nm). (d) Particle size distribution of GNPs by dynamic light scattering instrument (DLS)
