Synthesis of Se-doped ZnO nanoplates with enhanced photoelectrochemical and photocatalytic properties
Synthesis of Se-doped ZnO nanoplates with enhanced photoelectrochemical and photocatalytic properties
复制标题
具有增强光电化学和光催化性能的 Se 掺杂 ZnO 纳米片的合成
DOI：
10.1016/j.matchemphys.2017.07.036
复制
发表时间：
2017
影响因子：
4.6
通讯作者：
Wang WZ
中科院分区：
文献类型：
--
作者：
Chen Yuanlu;Wang Lijuan;Cao Maosheng;Wang Wenzhong;Cao MS;Wang WZ
在这项工作中，我们展示了一种新的和简单的两步策略，大规模合成硒掺杂的ZnO纳米片相结合的机械合金化和退火过程，其中ZnSe纳米晶体首先通过机械合金化的方法制备，然后在空气中退火过程中，将硒作为掺杂剂在ZnO中形成硒掺杂的ZnO纳米片。X射线衍射（XRD）和高分辨透射电子显微镜（HRTEM）研究表明，所制备的硒掺杂ZnO为纤锌矿结构。X射线光电子能谱（XPS）和拉曼光谱分析结果表明，Se成功地掺杂到ZnO中。紫外-可见吸收光谱表明，与未掺杂的ZnO纳米晶体相比，Se掺杂的ZnO纳米片的吸光度显著增强。室温光致发光（PL）谱表明，硒掺杂的ZnO纳米片的光生载流子的复合被显着抑制。所制备的硒掺杂氧化锌纳米片具有显著增强的光电化学和光催化降解活性。Se掺杂ZnO纳米片的光电流密度高达10.02mA/cm 2，明显大于未掺杂ZnO纳米晶的光电流密度（10.015mA/cm 2）。在2.5 h内，硒掺杂ZnO纳米片对亚甲基蓝（MB）染料的光降解率为94.5%，明显高于未掺杂ZnO纳米片（59.4%）。此外，硒掺杂的氧化锌纳米片在用于光催化降解有机染料4个循环后显示出高的稳定性。
In this work, we demonstrate a novel and facile two-step strategy for large scale synthesis of Se-doped ZnO nanoplates by combining mechanical alloying with annealing process, in which ZnSe nanocrystals were firstly prepared via a mechanical alloying method, and followed by annealing process in air to incorporate Se as a dopant in ZnO to form Se-doped ZnO nanoplates. X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) studies indicate that the as-fabricated Se-doped ZnO is the wurtzite ZnO structure. X-ray photoelectron spectroscope (XPS) and Raman results reveal that Se is successfully doped into ZnO. UV-vis absorption spectra of the Se-doped ZnO nanoplates reveal the significantly enhanced light absorbance compared with undoped ZnO nanocrystals. Room temperature photoluminescence (PL) spectra indicate that recombination of photogenerated charge carriers for Se-doped ZnO nanoplates is inhibited significantly. The achieved Se-doped ZnO nanoplates show remarkably enhanced photoelectrochemical (PEC) and photocatalytic degradation activity. The photocurrent density of Se-doped ZnO nanoplates reaches up to ∼0.2 mA/cm2, which is significantly larger than that of undoped ZnO nanocrystals (∼0.015 mA/cm2). The photodegradation of methylene blue (MB) dye in 2.5 h over Se-doped ZnO nanoplates is about 94.5%, which is significantly enhanced to the undoped ZnO nanocrystals (59.4%). Furthermore, Se-doped ZnO nanoplates show high stability after being used for photocatalytic degradation organic dye during 4 cycles.