الفهرس 
NanotechnologyOnly 14 pages are availabe for public view
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Abstract
Silver and gold nanoparticles have wide applications in catalysis,
sensing, optics, electronics and biomedical fields. Plant-mediated
synthesis of nanoparticles represents an efficient safe alternative for the
traditional synthetic routes. Plants contain abundant natural compounds
such as terpenoids, steroids, flavonoids, tannins other nutritional
compounds. These natural products can act as reducing and stabilizing
agents for the bioreduction reaction to synthesized novel metallic
nanoparticles. Phytosynthesized nanoparticles have biocompatibility and
reduced toxicity due to capping them with the biogenic surfactants of
plants which can contribute to the stability of the nanoparticles and
influence their properties.
In this study, silver and gold nanoparticles were synthesized via a
green route using 70% alcoholic F. sycomorus leaf extract. Tuning of the
experimental parameters (namely, extract quantity, metal ion
concentration, and pH-value) allowed a controlled synthesis of the size,
shape and size distribution of the nanoparticles. UV-visible spectroscopy
had been utilized to monitor the spectral profile changes of the surface
plasmon resonance (SPR) of the nanoparticles at various conditions. The
SPR band varies between 420 and 450 nm and between 525 and 565 nm
for silver and gold nanoparticles, respectively, depending on the different
reaction parameters. The successful preparation of spherical
monodispersed AgNPs (4 nm) and AuNPs (11 nm) was confirmed by
transmission electron microscopic (TEM) analysis. The FT-IR data
indicated that flavonoid glycosides played a major role in the reduction
and stabilizing of metal ions. The as-prepared AgNPs and AuNPs had
used as efficient green catalysts for methylene blue degradation in the
presence of NaBH4