Typical SEM images of AgNPs synthesized using 6% ASPE
and 6 mM AgNO3 at above mention conditions are presented in
Fig. 3(a)–(c) with different magnification scale. It was observed thatthe surface morphology of AgNPs biosynthesized from ASPE solution
clearly indicated that they were in irregular shapes. Here, some
smaller particles (black circles) of spherical as well as irregular
shapes were also seen with different sizes. There were observed
few traces of AgNPs clusters/microstructures (white circles) due
to aggregation of nanoparticles which might be induced by the
evaporation solvent during sample preparation. These could have
contributed for the variation in a particle size.
The elemental composition of powdered samples was determined
using SEM equipped with an EDAX detector. The energy
dispersive X-ray analysis (EDAX) shown in Fig. 4 revealed the
strong signal in the silver region and confirmed the formation of
AgNPs. Metallic silver nanocrystals generally show typical optical
absorption peak approximately at 2.983 keV due to surface plasmon
resonance. There were also observed spectral signals for carbon
and oxygen indicated that the extracellular organic moieties (from
ASPE) were adsorbed on the surface or in the vicinity of the metallic
nanoparticles. However, Zr comes from the artifact during sample
preparation.
TEM technique was employed to visualize the size and shape of
AgNPs formed. The typical TEM image of the biosynthesized AgNPs
are shown in Fig. 5(a)–(c). The AgNPs were irregular in shapes and
different sizes ranging from 3 to 25 nm with 10.78 nm average size.
There are few traces of AgNPs clusters which may contribute for
the variation in particle size. Inset of Fig. 5(a) indicates histogram
which shows the average particle size of these irregular shaped
nanoparticles. The calculation of the size is done based on different
TEM images. To measure the maximum size, diagonal lengths of
the individual particles are considered. It was noticeable that the
edges of the particles were lighter than the centers, suggesting that
biomolecules, such as proteins in ASPE have capped the silver NPs
and were adhered to their surfaces (Ahmad et al., 2010). Selected
Typical SEM images of AgNPs synthesized using 6% ASPE
and 6 mM AgNO3 at above mention conditions are presented in
Fig. 3(a)–(c) with different magnification scale. It was observed thatthe surface morphology of AgNPs biosynthesized from ASPE solution
clearly indicated that they were in irregular shapes. Here, some
smaller particles (black circles) of spherical as well as irregular
shapes were also seen with different sizes. There were observed
few traces of AgNPs clusters/microstructures (white circles) due
to aggregation of nanoparticles which might be induced by the
evaporation solvent during sample preparation. These could have
contributed for the variation in a particle size.
The elemental composition of powdered samples was determined
using SEM equipped with an EDAX detector. The energy
dispersive X-ray analysis (EDAX) shown in Fig. 4 revealed the
strong signal in the silver region and confirmed the formation of
AgNPs. Metallic silver nanocrystals generally show typical optical
absorption peak approximately at 2.983 keV due to surface plasmon
resonance. There were also observed spectral signals for carbon
and oxygen indicated that the extracellular organic moieties (from
ASPE) were adsorbed on the surface or in the vicinity of the metallic
nanoparticles. However, Zr comes from the artifact during sample
preparation.
TEM technique was employed to visualize the size and shape of
AgNPs formed. The typical TEM image of the biosynthesized AgNPs
are shown in Fig. 5(a)–(c). The AgNPs were irregular in shapes and
different sizes ranging from 3 to 25 nm with 10.78 nm average size.
There are few traces of AgNPs clusters which may contribute for
the variation in particle size. Inset of Fig. 5(a) indicates histogram
which shows the average particle size of these irregular shaped
nanoparticles. The calculation of the size is done based on different
TEM images. To measure the maximum size, diagonal lengths of
the individual particles are considered. It was noticeable that the
edges of the particles were lighter than the centers, suggesting that
biomolecules, such as proteins in ASPE have capped the silver NPs
and were adhered to their surfaces (Ahmad et al., 2010). Selected
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