Figure 1.

TEM characterization and UV–visible absorption spectra of AuNPs and AgNPs.

Notes: Particles were spotted onto carbon-coated Cu grids and dried under air prior to TEM imaging. The particle size distributions were determined by measuring the nanoparticles from micrographs using ImageJ with n>200 for each sample. TEM (A), size distribution (C) and UV–visible absorption spectrum (E) of AuNPs. TEM (B), size distribution (D) and UV–visible absorption spectrum (F) of AgNPs.

Abbreviations: AgNPs, silver nanoparticles; AuNPs, gold nanoparticles; TEM, transmission electron microscopy; UV, ultraviolet.