Figure 7.

SEM micrographs of the different kinds of gold nanoparticles observed from the reaction of Au³⁺ cations with Memecylon edule leaf extract: scale bar 500 nm (A), 200 nm (B), 100 nm (C), 50 nm (D). SEM images of gold nanoparticles with corresponding selected area electron diffraction (SAED) patterns of the nanocrystalline M. edule samples at 20 nm. Hexagonal (E), square (F), tetrahedral (G), icosahedral multiple twinned (H), circular (I) spindle (J), energy dispersive X-ray spectrum equipped with SEM of gold nanoparticles resulting from the experiment using 15 mL of M. edule leaf extract (K).