82 5 One- and Two-Dimensional Nanoparticles
An example of a rod-like structure is depicted in Figure 5.2. These ZnO rods
with a length of the around 15 μnm and a diameter in the range from 120 to
140 nm are clearly separated. Because of their excellent luminescence properties
in the UV, ZnO nanoparticles and nanorods are of scientific and economic interest. (According to the definitions of nanomaterials, these rods with linear dimenFigure 5.2 Secondary electron micrograph of ZnO nanorods [1]. At one end, most of these
nanorods show a bulge, which is typical for a synthesis via a gas-phase route. (Reproduced
with permission of Springer.)
5 µm
Figure 5.3 Gold platelets. This special
hexagonal shape was obtained by the
addition of poly vinyl pyrrolidone to the
solution used for precipitation [2]. Fig. 1a,b.
(a) Electron micrograph of the gold platelets.
The size of these hexagonal platelets is
around 400 nm; the thickness is in the range
from 25 to 60 nm. (b) Electron diffraction
pattern of one gold platelet as depicted in
Figure 5.3a. The hexagonal symmetry of the
diffraction pattern shows that the electron
beam was perpendicular to the faces of a
platelet; which were (111) planes at the
surface. (Reproduced with permission by The
American Institute of Physics.)
400 nm
(a)
(b)
An example of a rod-like structure is depicted in Figure 5.2. These ZnO rods
with a length of the around 15 μnm and a diameter in the range from 120 to
140 nm are clearly separated. Because of their excellent luminescence properties
in the UV, ZnO nanoparticles and nanorods are of scientific and economic interest. (According to the definitions of nanomaterials, these rods with linear dimenFigure 5.2 Secondary electron micrograph of ZnO nanorods [1]. At one end, most of these
nanorods show a bulge, which is typical for a synthesis via a gas-phase route. (Reproduced
with permission of Springer.)
5 µm
Figure 5.3 Gold platelets. This special
hexagonal shape was obtained by the
addition of poly vinyl pyrrolidone to the
solution used for precipitation [2]. Fig. 1a,b.
(a) Electron micrograph of the gold platelets.
The size of these hexagonal platelets is
around 400 nm; the thickness is in the range
from 25 to 60 nm. (b) Electron diffraction
pattern of one gold platelet as depicted in
Figure 5.3a. The hexagonal symmetry of the
diffraction pattern shows that the electron
beam was perpendicular to the faces of a
platelet; which were (111) planes at the
surface. (Reproduced with permission by The
American Institute of Physics.)
400 nm
(a)
(b)