Abstract In this study, TiO 2 nanoparticles containing 0–10 mol% ZnO were synthesized using the polymeric precursor method. The surface excess of ZnO on the TiO 2 surface was measured by the selective lixiviation method, and the grain boundary (GB) excess was calculated considering the total amount of ZnO and its solubility in the TiO 2 bulk. The results showed that ZnO segregates on both the surface and GBs of the TiO 2 nanopowder and that the GBs are richer in ZnO at high ZnO concentrations. X-ray photoelectron spectroscopy (XPS) analysis confirmed that ZnO segregated on the TiO 2 surface. However, after acid lixiviation, the same analysis showed a considerable reduction of the surface concentration of ZnO. A systematic reduction in the crystallite size and an increase in the specific surface area of TiO 2 were observed when increasing the ZnO concentration, which confirms the nanoparticle stability provided by the interfaces enrichment with ZnO. By measuring the electrophoretic mobility, it was possible to show the changes to the surface composition of the TiO 2 nanoparticles and the pH for ZnO solubilization.

中文翻译：

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ZnO掺杂的TiO 2 锐钛矿纳米粉体的表面和晶界过剩

摘要 在本研究中，使用聚合前驱体法合成了含有 0-10 mol% ZnO 的 TiO 2 纳米颗粒。通过选择性浸出法测量 TiO 2 表面上 ZnO 的表面过量，并考虑 ZnO 的总量及其在 TiO 2 本体中的溶解度计算晶界 (GB) 过量。结果表明，ZnO 在 TiO 2 纳米粉末的表面和 GB 上均偏析，并且 GB 在高 ZnO 浓度下富含 ZnO。X射线光电子能谱(XPS)分析证实ZnO在TiO 2 表面偏析。然而，在酸浸出后，同样的分析表明 ZnO 的表面浓度显着降低。当增加 ZnO 浓度时，观察到微晶尺寸的系统减小和 TiO 2 比表面积的增加，这证实了界面富集 ZnO 提供的纳米颗粒稳定性。通过测量电泳迁移率，可以显示 TiO 2 纳米颗粒的表面组成和 ZnO 溶解的 pH 值的变化。