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In this study three catalyst series were analysed using XPS. The binding energies of the platinum peaks in Figure 3 are consistent with platinum being present as platinum(0). The XPS analysis also showed that the Pt 4 f looks like mainly Pt(0) or Pt metal. Pt-Sn/A120, (250 m’lg) catalyst with a Pt:Sn ratio of > 1:8 c - m z w c 5 498 4 94 4 90 4 86 482 4 78 BINDING ENERGY. The Pt(2) which shows from the XPS spectrum was probably an oxide layer on the Pt metal or possibly dissolved in the SnO2. The binding energies of both the Sn 3d5/2 and Sn 3d3/2 shifted by 0.01 eV with respect to the pure SnO2 XPS spectrum sintered at the same temperature (1000oC) and this is an indication that the chemical environment was changing due to the incorporation of Pt in SnO2. The atomic ratio of oxygen and tin (ratio of O 1s and Sn 3d5/2) is ~ 1.30:1, a deviation of stoichiometry which was caused by oxygen deficiency on the surface region. The effects of Sn incorporation on morphological, structural and optical properties of ZnO films were investigated.
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The Sn 3d5/2 peak was symmetric and has a small FWHM indicating that the compound has one component only. In this work, Undoped Zinc Oxide (ZnO) and Sndoped Zinc Oxide (ZnO:Sn) films have been deposited by sol-gel dip coating method, where the Sn/Zn atomic ratio was 3 and 5 in the solution. The asymmetry in the O 1s also shows that adsorbed oxygen exists on the surface of the sample in ambient atmosphere.
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The FWHM XPS spectrum was broader than the pure SnO2, which shows that there is a greater range of chemical environments and hence binding energies. The high resolution scan of revealed that the O 1s has a binding energy of 530.2 eV which indicates that there were oxygen vacancies in the doped material. A 100 of Sn can be recovered by leaching in 0.1mol/L Na2-EDTA solution for 3 hours at 80 C with optimum conditions of pH: 5, liquid/solid ratio:30, particle. In XPS analysis, the position of a peak on the x-axis indicates the elemental and chemical composition. So, when it comes to XPS data interpretation, here’s what you need to know. Peak-fitting of the overlapping Sr3d and P2p region also showed the presence of previously unreported doublets for each element. The amorphous Sr containing CaP coating was shown to contain Sr with a Ca/P and (Ca + Sr)/P atomic ratios of 1.18 ± 0.05 and 1.49 ± 0.05, respectively. The XPS spectrum showed the Sn 4d, Sn 4p, Sn 4s, C 1s,Sn 3d5/2, Sn 3d3/2, O 1s, Sn 3p1/2 and Sn 3s peaks. XPS analysis is rooted in understanding the position and intensity of peaks on the survey scans and the high-resolution spectra data. The CaP coating had a high Ca/P atomic ratio at 1.81 ± 0.02. Pt-SnO2 ceramics were fabricated by the dry pressing method and sintered at 1000oC.