The vibrating sample magnetometer results depict that the zinc sulfide and Fe-doped zinc sulfides are ferromagnetic.
The photoluminescence spectra reveal the shift from ultraviolet to violet emission. Fourier transform infrared spectra confirmed the formation of zinc sulfide and the substitution of Fe ion in it. The ultraviolet–visible absorption spectra shows the blue shift in the bandgap (5.0–5.96 eV) due to the quantum confinement effect. The mean particle size from the transmission electron microscopy image is found to decrease from 14.7 to 4.4 nm. The average crystallite size was found to decrease with Fe dopant while the lattice constant increased. The x-ray diffraction analysis confirmed the single-phase nature of the nanoparticles with the zinc-blend crystal structure. The structural, optical, and magnetic properties of synthesized quantum dots were investigated using x-ray diffraction, transmission electron microscopy, fourier transform infrared spectroscopy, ultraviolet–visible absorption spectroscopy, x-ray photoelectron spectroscopy, and photoluminescence spectroscopy.
ZnS and Fe doped ZnS quantum dots were synthesized by homogeneous chemical co-precipitation method using polyethylene glycol as a capping agent.
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