Figure 2: SCharacterization of the synthesized AuNP. (a) UV-Vis spectra of as synthesized (solid line) AuNP (λ=515 nm) and aged gold nanoparticles (dashed line) for 5 months (λ=519 nm). (inset shows TEM image of AuNP. (b) 3D AFM image of the synthesized gold nanoparticles showing the size distribution. Colors of peaks relate to the sizes: white (>10nm), yellow (7-10 nm), red (4-6 nm), and black (<4 nm).