The Preparation of II–VI Semiconductor Nanomaterials - Semiconductor Quantum Dots: Organometallic and Inorganic Synthesis - page 7

d n 1 y 4 n g | 1

d n 4 .

Figure 1.2 X-ray diraction patterns for CdSe nanoparticles of varying diameters:
(a) 1.2 nm; (b) 1.8 nm; (c) 2.0 nm; (d) 3.7 nm; (e) 4.2 nm; (f) 8.3 nm;
(g) 11.5 nm; (h) bulk CdSe. Reprinted with permission from C. B.
Murray, D. J. Norris and M. G. Bawendi, J. Am. Chem. Soc. , 1993, 115,
8706. Copyright 1993 American Chemical Society.

injection. It is worth noting, however, that TOPO slowly decomposes above
330 C. The nanoparticles prepared were larger, but possessed a larger size
distribution. This was remedied by adding the precursor stock solution in 0.1
mL amounts. Particles prepared by this route were more spherical 24 and had
fewer stacking faults, although small variations in temperature resulted in
large di erences in size distribution.

The actual size range of particles from a single reaction is a key parameter
and the literature o icting reports as to which route provides the

lowest size distribution. Alivisatos addressed the issue, based on the Gibbs

ers con 

-
Thompson equation and reported a detailed study on the kinetics and
growth model of CdSe particles, suggesting that di

usion-limited growth

could reduce the size distribution if the di usion area and particle size were