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d
n
1
y
4
n
g
|
4
Figure 7.2
Shape change map of MnS particles for varying growth temperatures and
reaction times. Reprinted with permission from Y.-W. Jun, Y.-Y. Jung
and J. Cheon,
J. Am. Chem. Soc.
, 2002, 124, 615. Copyright 2002
American Chemical Society.
.
prepared,
ca.
7 nm wide with aspects ratios of
ca.
4. Up to 12% manganese
could be doped in the rods, and surface exchange experiments suggested that
the dopant ions were situated throughout the body of the particle and not
just on the surface. Ag
2
S has also been prepared from a slurry of silver
diethyldithiocarbamate in octadecene (ODE) with OA and OAm at 200
C.
The resulting particles were
ca.
10 nm in diameter, monodispersed,
and exhibited near infrared absorption and an emission maximum at
ca.
1060 nm.
45
A notable study on a range of single-source precursors suggested that most
primarily gave spherical particles, whilst cadmium thiosemicarbazide and
cadmium selenosemicarbazide had lower activation barriers for decompo-
sition relative to other single-source precursors, and released a nitrogen-
containing side product that coordinates to the particle surface and aided
anisotropic growth.
46,47
7.4 Single-Source Routes to Core/Shell Particles
The use of asymmetric precursors has been applied to the formation of CdSe/
CdS core shell particles in a simple one-pot reaction.
48
Cores of CdSe, 4.5 nm
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