Synthesis Of Zinc Selenide Coated By Zinc Sulfide Nanoparticles Via Modified Polyol Method

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dc.contributor.authorLee, See Yau
dc.date.accessioned2018-08-28T07:35:21Z
dc.date.available2018-08-28T07:35:21Z
dc.date.issued2011-07
dc.description.abstractZinc 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.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6435
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectSynthesis of zinc selenide coated by zinc sulfideen_US
dc.subjectnanoparticles via modified polyol methoden_US
dc.titleSynthesis Of Zinc Selenide Coated By Zinc Sulfide Nanoparticles Via Modified Polyol Methoden_US
dc.typeThesisen_US
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