Rapid synthesis of Zn2+ doped SnWO4 nanowires with the aim of exploring doping effects on highly enhanced visible photocatalytic activities
Rapid synthesis of Zn2+ doped SnWO4 nanowires with the aim of exploring doping effects on highly enhanced visible photocatalytic activities
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DOI：
10.1039/c2ra20401k
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发表时间：
2012-07
期刊：
影响因子：
3.9
通讯作者：
Yiguo Su;Lichun Hou;Chunfang Du;Liman Peng;K. Guan;Xiaojing Wang
中科院分区：
文献类型：
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作者：
Yiguo Su;Lichun Hou;Chunfang Du;Liman Peng;K. Guan;Xiaojing Wang
在这项工作中，我们报道了Sn1−xZnxWO4纳米晶体的快速合成，目的是定制其结构，电子和光催化性能。通过x射线衍射、透射电子显微镜、电感耦合等离子体发射光谱、紫外-可见漫反射光谱和barrett - emmet - teller技术对样品进行了仔细的表征。通过实验和理论研究了在snowo4中掺杂Zn2+对亚甲基橙染料溶液的电子结构和光级的影响。结果表明，Zn2+离子以x = 0.060的溶解度均匀地掺入到SnWO4基体晶格中，导致晶格体积单调减小。掺杂Zn2+后，SnWO4纳米晶的形貌由不规则的纳米片转变为纳米线。同时，BET表面积也从54 m2 g−1大大增加到~ 100 m2 g−1。与量子尺寸效应的理论预测相反，Zn2+掺杂的SnWO4纳米晶体显示出异常的带隙缩小，这可以定义为量子尺寸效应、晶格收缩、电负性和表面缺陷中心平衡的结果。通过Zn2+掺杂控制Sn1−xZnxWO4纳米晶体的形貌、表面积和电子结构，在Zn2+掺杂水平x = 0.045时，Sn1−xZnxWO4纳米晶体的光催化性能得到优化。
In this work, we report on the rapid synthesis of Sn1−xZnxWO4 nanocrystals with the aim of tailoring their structural, electronic, and photocatalytic properties. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, inductive coupled plasma optical emission spectroscopy, UV-vis diffuse reflectance spectroscopy, and the Barrett–Emmett–Teller technique. The effects of Zn2+ doping in SnWO4 on the electronic structure and photogradation of methylene orange dye solution were investigated experimentally and theoretically. It was found that Zn2+ ions were homogeneously incorporated into the SnWO4 host lattice with a solubility of x = 0.060, which led to a monotonous decrease in lattice volume. With Zn2+ doping, SnWO4 nanocrystals showed a morphological alteration from irregular nanosheets to nanowires. Meanwhile, the BET surface areas were also greatly enlarged from 54 m2 g−1 to ∼100 m2 g−1. Contrary to the theoretical predictions of the quantum size effect, Zn2+ doped SnWO4 nanocrystals showed an abnormal band gap narrowing, which can be well-defined as a consequence of the balance of quantum size effect, lattice contraction, electronegativity, and surface defect centers. With well-controlled morphology, surface area, and electronic structure via Zn2+ doping, the photocatalytic performance of Sn1−xZnxWO4 nanocrystals was optimized at a Zn2+ doping level of x = 0.045.