Synthesis Of Zinc Selenide Coated By Zinc Sulfide Nanoparticles Via Modified Polyol Method
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Date
2011-07
Authors
Lee, See Yau
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Zinc selenide (ZnSe) nanoparticles and zinc selenide@zinc sulphide
(ZnSe@ZnS) core-shell structure were prepared using a surfactant-assisted process.
ZnSe nanoparticles were prepared using zinc chloride and selenium powder as the
precursor sources. The obtained ZnSe nanoparticles were then coated with ZnS to
form the ZnSe@ZnS core-shell structure. Various parameters namely processing
time, processing temperature, precursor ratio, concentration of surfactant, molecular
weight of surfactant, and type of surfactant have been studied in order to produce
finer particle with narrow particle size distribution of the ZnSe and ZnSe@ZnS coreshell
nanoparticles. The optimum condition for the synthesis of ZnSe nanoparticles
was 195°C for 2 minutes with the Zn to Se ions ratio of 1:1. Furthermore, 0.02g of
10,000 Mw polyethylene glycol (PEG) was found to be the most effective surfactant
to form the nanoparticles with the mean diameter of 2.96 nm and particle size
distribution within 1.5 – 4.5 nm. TEM and SEM analysis confirmed that the
synthesized ZnSe and ZnSe@ZnS core-shell nanoparticles had a small particle size
and a quasi-spherical shape with mild agglomeration. The success for the formation
of ZnSe and ZnSe@ZnS core-shell nanoparticles was further confirmed by XRD,
EDX, and ESI testing. PL and UV-Vis analysis recorded emission and absorption
wavelength at 402 nm and 464 nm respectively. The successful of ZnS coating on
ZnSe cores were confirmed by the drastic enhancement of PL intensity and red shift
of ZnSe@ZnS absorption peak from UV-Vis testing.
Description
Keywords
Synthesis of zinc selenide coated by zinc sulfide , nanoparticles via modified polyol method