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![Fig. 6. The ln[-ln(1-f(t))]-ln(t) diagrams for the oxygen adsorption...](publication/305345253/figure/fig6/AS:668992763068423@1536511712306/The-ln-ln1-ft-lnt-diagrams-for-the-oxygen-adsorption-process-at-a-70-C-and-b_Q320.jpg)
ZnS nanoparticles were synthesized through a one-step precipitation process. Effect of time and temperature on the formation reaction was investigated. The synthesized samples were characterized by X-ray diffraction (XRD), ultraviolet (UV) visible absorption and photoluminescence (PL) spectrophotometry. Based on XRD and UV-Vis data, the particles p...
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... obtained sam- ples were characterized by XRD, UV-Vis absorp- tion and PL spectroscopy. The experimental condi- tions of preparing the twelve samples used in this study are summarized in Table 1. ...
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... red shifts are observed in the PL spectra of the samples A1 to A6 synthe- sized at 70 °C which is related to the slight parti- cles growth in the reaction time intervals between 30 and 240 minutes. Such behavior was also ob- served in the samples synthesized at 90 °C (set B, Table 1). Fig. 4 shows the diagrams of maximum PL in- tensity versus reaction time at 70 °C and 90 °C. ...
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In the present work, mixed structure Zn(S,O) nanoparticles have been synthesized using solution based chemical coprecipitation technique. Two different zinc sources (Zn(CH 3 COO) 2 ·2H 2 O and ZnSO 4 ·7H 2 O) and one sulfur source (CSNH 2 NH 2 ) have been used as primary chemical precursors for the synthesis of the nanoparticles in the presence and absence of a capping agent (EDTA). The structural, morphological, compositional and optical properties of the nanoparticles have been analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transmission infra-red (FT-IR) and UV-Visible (UV-Vis) spectroscopy. XRD revealed the formation of mixed phases of c-ZnS, h-ZnS and h-ZnO in the synthesized nanoparticles. The surface morphology was analyzed from SEM micrographs which showed noticeable changes due to the effect of EDTA. EDX analysis confirmed the presence of zinc, sulfur and oxygen in Zn(S,O) nanoparticles. FT-IR spectra identified the presence of characteristic absorption peaks of ZnS and ZnO along with other functional group elements. The optical band gap values were found to vary from 4.16 eV to 4.40 eV for Zn(S,O) nanoparticles which are higher in comparison to the band gap values of bulk ZnS and ZnO. These higher band gap values may be attributed to the mixed structure of Zn(S,O) nanoparticles.
