Ma. Malik et al., Air-stable single-source precursors for the synthesis of chalcogenide semiconductor nanoparticles, CHEM MATER, 13(3), 2001, pp. 913-920
Bis(hexylmethyldithio-/diselenocarbamato)cadmium(II)/zinc(II) (M(E(2)CNMe(n
)Hex)(2) [M = Zn, Cd; E = S, Se]) have been used as single-source precursor
s for the preparation of TOPO-capped CdS, CdSe, ZnS, and ZnSe nanoparticles
. The precursors are stable for long periods of time and pyrolyse cleanly t
o give high yields of nanocrystals. The nanoparticles were of high quality,
close to monodispersed, and showed quantum confinement with characteristic
close to band edge luminescence in their emission spectra. The broad diffr
action in the XRD pattern and diffuse diffraction rings of the SAED pattern
are typical of nanometric size particles. The TEM micrographs showed well-
defined, close to spherical particles and the lattice fringes in the HRTEM
images confirmed the crystalline nature. The presence of a strong phosphoru
s peak in the EDAX spectra is indicative of TOPO or TOPE (E = S or Se) boun
d to the surface.