Structural and optical properties of ZnO and manganese-doped ZnO

Abstract

The structural, morphological and optical properties of manganese oxides supported on commercial ZnO, prepared by impregnation with manganese nitrate, were investigated. The nominal compositions of Mn in the samples were 5, 10, 15 and 20 %w/w.The Xray diffraction (XRD) experiments revealed the presence of the ZnO wurtzite phase in all the samples, and ZnMnO 3 was also found in the samples with 15 wt% and 20 wt% of Mn. X-ray photoelectron spectroscopy (XPS) showed the presence of Mn 2+ and Mn 4+ in the xMnZnO samples. The results showed that the Mn 2+ ions had

Preparation and Characterization of ZnO Nanoparticles Supported on Amorphous SiO2

“…The peaks of ZnO–SiO 2 -pH5.0 and ZnO–SiO 2 -pH7.0 at 1046.0 and 1045.5 eV correspond to Zn2p 1/2 orbital; the peaks at 1023.0 and 1022.5 eV correspond to the Zn2p 3/2 orbital [ 26 ]. These peaks are equivalent to the 2p 1/2 and 2p 3/2 energy peaks (1044.2 and 1021.2 eV) of ZnO [ 27 ]. Moreover, the energy difference between Zn2p 1/2 and Zn2p 3/2 orbitals is 23 eV, which is the same as that of ZnO.…”

Adjusting the band structure and defects of ZnO quantum dots via tin doping

“…It appeared that Sn 2+ - doped ZnO QDs still maintained the main phase of ZnO, which was different from those of the Sn-doped ZnO NPs with a high Sn concentration [24][25][26] but was the same as that of the Sb doped ZnO with a low Sb concentration. 27 The interplanar spacing increased with increasing Sn 2+ concentration. This was similar to the trend in the calculated cell parameters of Zn 1Àx Sn x O, as shown in Table 1.…”

“…All the data were corrected with respect to the standard peak of C 1s at 284.6 eV. [27][28][29][30] As shown in Fig. 4, for all the samples, both Sn and Zn peaks could be found in the XPS spectra.…”

Investigation of Catalytic Ozonation of Recalcitrant Organic Chemicals in Aqueous Solution over Various ZSM-5 Zeolites

“…Figure 3c showed that Mg1s XPS peak from Mg 2+ oxides at 1303-1305 eV for Mg loaded ZSM-5 zeolites [34]. The 2p XPS peak for Zn loaded ZSM-5 zeolites was located at 1021-1025 eV [35], associated to Zn 2+ oxides ( Figure 3d). The contents of Mg or Zn on NaZSM-5(120), NaZSM-5(45) and NaZSM-5(31) were 6.7 wt% or 5.9 wt%, 8.7 wt% or 9.5 wt%, and 5.6 wt% or 5.1 wt%, respectively, by XPS analysis.…”