Metallic Nanoparticles for Biomedical Applications
45
depicted in Fig. 8. As the MR increases, evolution in shape, size, and crystallinity
is also observed. With MR = 0.2, synthesized particles contain nanorods in excess
with some spherical and triangular shape. Increasing the amount of PVP (MR =
0.9) produced more spherical shaped particles and less amount of nanorods. Further,
the length of the nanorods is decreased. With MR = 5, only triangular-shaped NPs
are produced, both spherical, and nanorods are disappeared. When MR increased
to 12.1, synthesized particles are of hexagonal plates of various sizes and triangular
plates. Bigger NPs are produced by increasing the MR and heating time. Big triangular prisms, hexagonal plates, and enneahedral plates were synthesized with MR
= 16.6. It has been found experimentally that PVP can selectively adsorb on three
facets of {100}, which results in the addition of Ag atoms to the {111} facets. Hence,
three {100} of hexagonal plate becomes bigger, and {111} disappears, results in the
Fig. 8 Effect of molar ratio in the solvothermal synthesis of Ag NPs; TEM images of particles
synthesized when the MR of PVP and AgNO 3 is a 0.2 b 0.9, c 5, d 12.1 and e 16.6. Reprinted with
permission from [48]. Copyright (2007) American Chemical Society
45
depicted in Fig. 8. As the MR increases, evolution in shape, size, and crystallinity
is also observed. With MR = 0.2, synthesized particles contain nanorods in excess
with some spherical and triangular shape. Increasing the amount of PVP (MR =
0.9) produced more spherical shaped particles and less amount of nanorods. Further,
the length of the nanorods is decreased. With MR = 5, only triangular-shaped NPs
are produced, both spherical, and nanorods are disappeared. When MR increased
to 12.1, synthesized particles are of hexagonal plates of various sizes and triangular
plates. Bigger NPs are produced by increasing the MR and heating time. Big triangular prisms, hexagonal plates, and enneahedral plates were synthesized with MR
= 16.6. It has been found experimentally that PVP can selectively adsorb on three
facets of {100}, which results in the addition of Ag atoms to the {111} facets. Hence,
three {100} of hexagonal plate becomes bigger, and {111} disappears, results in the
Fig. 8 Effect of molar ratio in the solvothermal synthesis of Ag NPs; TEM images of particles
synthesized when the MR of PVP and AgNO 3 is a 0.2 b 0.9, c 5, d 12.1 and e 16.6. Reprinted with
permission from [48]. Copyright (2007) American Chemical Society