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captain唐木虫 (著名写手)
论坛痞子
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[求助]
无机的，钨原子求翻译
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The chemical composition of the W18O49 nanocrystal synthesized using propanol was examined by X-ray photoelectron spectroscopy (XPS). The full range of XPS spectra of the W18O49 nanocrystal is shown in Figure 4a. Peaks at binding energies corresponding to oxygen and tungsten are clearly observed, and no impurities other than carbon were observed in the spectra. For tungsten, a complex energy distribution of W 4f photoelectrons was obtained, as shown in Figure 4b. The W 4f core-level spectrum could be fitted into three doublets, associated with three different oxidation states of W atoms. The main peaks, having W 4f5/2 at 37.8 eV and W 4f7/2 at 35.7 eV, are attributable to the W atoms being in a 6+ oxidation state. The second doublet, with a lower binding energy at 34.6 and 36.7 eV, resulted from emission of W 4f5/2 and W 4f7/2 core levels from the atoms in an oxidation state of 5+. Furthermore, the third doublet, observed at 33.7 and 335.8 eV, corresponded to the W4+ oxidation state. These three oxidation states are the typical oxidation states found in W18O49 nanomaterials, as reported previously.27,28 The photoelectrons from O 1s display a relatively wide and asymmetric peak, with the highest point at 530.5 eV, which could be assigned to the oxygen bond with W atoms in W18O49 (Figure 4c). The other peak at a higher photoelectron energy of 532.3 eV may be attributed to the residual water and/or C−O bond originating from the residual adsorbed molecules. |
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captain唐(phu_grassman代发): 金币+20, 翻译EPI+1, It's very kind of you. 2013-08-21 21:37:51
captain唐(phu_grassman代发): 金币+20, 翻译EPI+1, It's very kind of you. 2013-08-21 21:37:51
| 用X射线光电子谱(XPS)来检测由丙醇合成的W18O49纳米晶体的化学组成。图4a显示了W18O49纳米晶体的全部范围的XPS光谱。与氧和钨相关的结合能峰能够清晰地被观察到，在谱图中观察不到除了碳以外的杂质。对于钨，如图4b所示，可以得到一个复杂的W 4f光电子能量分布。这个W 4f芯态能谱对应三个双峰，这与W原子三种不同氧化态有关。主峰对应位于37.8eV的W 4f5/2和35.7eV的W 4f7/2，这是由于W原子存在6+的氧化态。位于34.6和36.7eV处结合能较低的第二个双峰，是由于5+的氧化态原子W 4f5/2和W 4f7/2的芯态发射所致。此外，在33.7和335.8eV处观察到的第三个双峰，对应W4+的氧化态。这三个氧化态是W18O49纳米材料的典型氧化态。在先前报道中27、28，O 1s光电子显示出一个最高点位于530.5eV处，相对较宽，不对称的峰，可以用来标记W18O49中与W原子相连的氧键(图4c)。另一个位于532.3eV的更高的光电子能峰可能归因于残留水的存在或是来自残留的吸附分子的C−O键的存在，或者两种原因兼而有之。 |
2楼2013-05-29 10:39:01
