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. 2013 Oct 9;8(10):e77486. doi: 10.1371/journal.pone.0077486

Figure 1. TEM analysis.

Figure 1

Gold nanoparticles synthesized by N. crassa extract at 60°C and pH 3 (A), pH 5.5 (B), and pH 10 (C). Insets: color change from before (yellow; left image) to after (red / purple; right image) incubation. D-F: Corresponding size distribution histograms of formed nanoparticles. G-H: HRTEM images of a quasi-spherical (G) and a hexagonal (H) gold nanoparticle with plane information. Gold nanoparticles synthesized by N. crassa extract at 60°C and pH 3 resulted in the formation of different shapes in a broad size range, incubation at 60°C and pH 5.5 results in the formation of mostly quasi-spherical particles and some different shapes, mainly triangles, with a main size range of 6 to 23 nm, and incubation at 60°C and pH 10 shows formation of quasi-spherical particles in a very small size range (3 to 12 nm).