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Huy B.T.,Changwon National University | Huy B.T.,Nhatrang Institute of Technology and Research Application | Seo M.-H.,Changwon National University | Kumar A.P.,Changwon National University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

We developed a facile strategy to synthesize transition metal (TM; Ni, Cr, Co, and Ti)-doped ZnSe nanoparticles (NPs) in aqueous media using a chemical co-precipitation method. Co-precipitation was performed in the presence of one of four different surfactants, namely mercaptoacetic acid (MAA), 3-mercaptopropionic acid (MPA), thioglycerol (TGC), or (3-mercaptopropyl) trimethoxysilane (MPTMS). Surface morphology, chemical, and crystalline properties of the TM-doped ZnSe NPs were studied by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Optical features were characterized by UV-visible and photoluminescence spectroscopies. The influence of various experimental parameters, including the amount of TM and the ratio of precursors, as well as different types of surfactants on the photoluminescence properties of TM-doped ZnSe NPs was investigated systematically. TM-doped ZnSe NPs were excited in the UV region and exhibited photoluminescence in the visible region. Intensity was affected by the concentration of the TM. The results showed that MPA had a stronger influence on photoluminescence than MAA, TGC, and MPTMS. The photoluminescence intensity of TM-doped ZnSe NPs was 30% higher than that of undoped ZnSe NPs. © 2013 Elsevier B.V. All rights reserved.


Huy B.T.,Changwon National University | Huy B.T.,NhaTrang Institute of Technology and Research Application | Seo M.-H.,Changwon National University | Phong P.T.,Dongguk University | And 2 more authors.
Chemical Engineering Journal | Year: 2014

Magnesium and copper doped CdS/ZnSe (core/shell) nanoparticles were synthesized through direct chemical solution routes in organic solvent. X-ray powder diffraction (XRD) pattern confirmed the mixing of cubic and wurtzite structures. The Mg or Cu-doped CdS shows the obvious blue shift of photolumimescent spectra due to the replacement of Cd ions with Mg or Cu ions. However, the concomitant presence of Mg and Cu, emission peaks relatively shifts to the red range in comparison with that of Cu-doped CdS. The photoluminescent intensity of CdS:Mg,Cu/ZnSe are much higher than that of the undoped CdS and CdS/ZnSe. The PL intensities were also strongly affected by the presence of octadecylamine and increased more than 4 times. The dopant ions, Mg and Cu, play an important role in energy transfer in the lattice. The results shows that CdS:Mg,Cu/ZnSe NPs give not only the luminescences in various region but also the excellent properties of CdS/ZnSe. © 2013 Elsevier B.V.

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