AFM images of gold nanotriangles synthesized by the reduction of 1 mM HAuCl4 by endophytic A. clavatus after 48 h (a–b) and 72 h (c–d). Vertical stacking and clustering was observed with advancement of reaction period (a, c) within nanoparticles. Surface roughness of the nanoparticles was measured 25–30 nm (b, d).
Verma et al. Nanoscale Res Lett 2011 6:16 doi:10.1007/s11671-010-9743-6