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It also originated from the dissolution of SO 2 into the surface electrolyte. The corresponding peaks cannot be seen in the XPS spectra of untreated TiO 2 layers shown in Figure S3. XPS is the measurement of photoelectrons ejected from the surface of a material that has been irradiated. The characteristic peaks of Na + 1s at 1071.4 eV and S 2 2p at 162.8 eV can be seen in the XPS spectra of TiO 2 layers with Na 2 S treatment in Figure 2a,b, respectively. X-ray photoelectron spectroscopy (XPS), also known as electron spectroscopy for chemical analysis (ESCA), is a highly surface-sensitive, quantitative, chemical analysis technique that can be used to solve a wide range of materials problems. The strongest surface peak is ascribed to the fracture of the FeS bond. The peaks of C 1s at 284.6 eV were used to calibrate the spectra. The origin of this feature is thought to be the breakage of sulphursulphur bonds.
XPS PEAK SULPHUR FULL SIZE
In contrast, only bisulfite was observed in the S 2p XPS spectra for the copper. This small peak is the most surface sensitive component. The XPS spectra of STiO 2 and pure TiO 2 nanoparticles a XPS scanning full survey spectra, b Ti 2p XPS spectra, c O 1s XPS spectra d S 2p XPS spectra Full size image The results found that the binding energy of S 2p peaks shift slightly toward high binding energy by 0.5 eV in comparison with that of sulfur in pure SO 4 2 (169.0 eV) 30. The bisulfite resulted from SO 2 dissolution into the surface electrolyte, and the others resulted from the reduction of sulfurous acid. Three peaks were observed in the S 2p XPS spectra for the silver originating from bisulfite, S 2O 5 2-, S 2O 3 2-, and S 2. There was a difference in the chemical state of the sulfur between the silver and copper. The shapes of the spectra were the same for both concentrations, indicating that the chemical state of the analyzed elements did not depend on the SO 2 concentration. By analyzing the organic sulfur content in the model compounds and the Xinyu refined coking coal, the curve fitting methods and setting parameters of XPS spectra were discussed. Therefore, the MBGO20 with active nitrogen and sulfur containing moieties was able to achieve the mitigated. In this study we analyzed the chemical state of sulfur on silver and copper plates exposed to flowing air containing low concentrations (18 and 148 ppb) of SO 2 using X-ray photoelectron spectroscopy (XPS). Compared with the N 1s XPS spectra of Figure 2e, we observed a peak shift towards higher binding energy values for pyridinic N (+0.57 eV), pyrrolic N (+0.58), and graphitic N (+0.18 eV), due to the favorable polar interactions 41,42.
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Although many studies have investigated the effect of SO 2 on the atmospheric corrosion of silver and copper, little is known about the early stage of their corrosion behavior. 10 Again, little difference in peak position is observed in Li 2 S 6 solution, which further. The third peak at 163.8 eV can be assigned to adsorbed sulfur (S ADS ). Sulfur dioxide (SO 2) is a typical gas affecting the atmospheric corrosion of metals, particularly outdoors. The peak at 161.6 eV may be assigned to terminal sulfur (S TER) in polysulfide chains, while the peak at 163.1 eV may be assigned to bridging sulfur (S BRI) in polysulfide chains.