Nanocrystals of CeVO4 doped by metallic heteroions.
Nanocrystals of CeVO4 doped by metallic heteroions.
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DOI：
10.1021/ic200459t
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发表时间：
2011-05
影响因子：
4.6
通讯作者：
Yeqian Shen;Yucheng Huang;Sujuan Zheng;Xuefeng Guo;Zhao‐Xu Chen;Luming Peng;Weiping Ding
中科院分区：
文献类型：
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作者：
Yeqian Shen;Yucheng Huang;Sujuan Zheng;Xuefeng Guo;Zhao‐Xu Chen;Luming Peng;Weiping Ding
采用水热法在无表面活性剂和模板剂的条件下制备了异质离子掺杂的切沃（4）纳米晶。采用透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、X射线衍射（XRD）、固体（51）V NMR和电感耦合等离子体（ICP）对材料的形貌、结构和组成进行了表征。X射线光电子能谱（XPS）结果表明，当Ca（2+）取代切沃（4）时，部分Ce原子的价态发生了变化，而V原子保持五价态V（5+）。拉曼光谱被用来监测掺杂离子对切沃（4）晶格收缩和畸变的影响。通过使用维也纳从头算模拟包进行的理论计算解释了掺杂切沃（4）的位移和加宽的拉曼峰的出现。对所得纳米晶的氧化还原性能和光催化活性进行了研究和讨论。
CeVO(4) nanocrystals doped by heteroions were prepared via a hydrothermal method without the presence of surfactants or templates. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), solid state (51)V NMR, and inductively coupled plasma (ICP) were used to characterize the morphology, structure, and compositions of the materials. X-ray photoelectron spectroscopy (XPS) results confirmed that there is a valence change from Ce(3+) to Ce(4+) for a fraction of cerium atoms whereas the vanadium atoms remain in the pentavalent state V(5+) upon the substitution of Ca(2+) into CeVO(4). Raman spectroscopy was used to monitor the effects of the doping ion on the CeVO(4) lattice contraction and distortion. The appearance of the shifted and broadened Raman peaks for the doped CeVO(4) was interpreted by theoretical calculations performed with Vienna ab initio simulation package. The redox properties and photocatalytic activities of the obtained nanocrystals were also investigated and discussed in detail.