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Abstract
The biosynthesis of nanoparticles is in the limelight of modern nanotechnology. Biogenic Ag and Au nanoparticles were synthesized by a rapid and simple procedure using leaves extract of tea as the reducing agent. The formations of Ag and Au nanoparticles were monitored using the UV-visible spectra as a function of the reaction time and the formation process, which determined that the optimal reaction time of Ag+ and Au3+ ions was 4 and 1 h, respectively. The as-synthesized Ag (53.2 ± 7.1 nm) and Au (31.7 ± 5.2 nm) nanoparticles were characterized by transmission electron microscopy, Fourier transform infrared spectra, and thermogravimetric analysis. The X-ray diffraction spectra showed that the Ag nanoparticle was composed of two nanocrystals, while the Au nanoparticle included one nanocrystal. This rapid biosynthesis approach can be described as a green technology because of no additional chemical reagents as stabilizers or reductants.