Figure 5: UV-vis-NIR kinetics, TEM and Atomic Force Microscopy (AFM) images of AuNPs produced by lemongrass. a) UV-vis spectra illustrating the time of reaction assay with gold ions over time. Curve 6 shows the spectrum obtained from a purified AuNP solution; inset shows the UV-Vis-NIR spectrum of a drop-cast film of purified gold nanotriangles attained from the reaction of AuCl4 - and lemongrass extract. b) TEM micrograph of synthesised circular and nanotriangular AuNPs by lemongrass extract. c) Histograph representing the size of triangular AuNPs; inset demonstrates purified gold nanotriangles. d) Selected Area Electron Diffraction (SAED) pattern of a gold nanotriangle. The highlighted spots correspond to the 1/3{422},{220} and {311} Bragg reflections with lattice spacings found to be 2.5, 1.44 and 1.23 Å respectively. e) AFM image of a gold nanotriangle and f) its dimensional profile. Reprinted by permission from Macmillan Publishers Ltd: Nature Materials [71], copyright 2004.