Preparation And Properties Of ZnS Nanocrystals And Fe₃O₄/zns Nanocomposites

Recently, unique multi-phonon resonance Raman scattering fingerprintcharacteristic of ZnS nanocrystals has attracted more attention and has been used inbiodetection. Exploiting their functionalization, and improving the biodetectionsensitivity and detection efficiency have become the key challenges. In thisdissertation, superparamagnetic Fe₃O₄nanoparticles with magnetic separation andmagnetic enrichment were introduced to prepare multifunctional Fe₃O₄/ZnSnanocomposites. The structures, the morphologies, the magnetic and opticalproperties of these nanocomposites were investigated. The details are as follows:The ZnS nanoparticles were prepared via thermal decomposition method. Theinfluences of the amounts of S on the composition, the morphology and the opticalproperties of the nanoparticles were investigated. The optimized experimentalcondition for preparing small ZnS Nanoparticles was determined. It provides a newand “green” synthesis method for the controlled preparation of sphalerite ZnSnanoparticles.Fe₃O₄nanoparticles were used as seeds to prepared Fe₃O₄/ZnS nanocompositesvia thermal decomposition method. Fe₃O₄/ZnS nanocomposites simultaneouslypossessed the optical properties of ZnS and superparamagnetic properties of Fe₃O₄.The proportion of ZnS affect on the intensity of Raman signals of Fe₃O₄/ZnSnanocomposites.. Such nanocomposites are expected to be used in biolabelling,bioseparation, biodetection, drug transportation and so on.