Novel hollow Pt-ZnO nanocomposite microspheres with hierarchical structure and enhanced photocatalytic activity and stability.
Novel hollow Pt-ZnO nanocomposite microspheres with hierarchical structure and enhanced photocatalytic activity and stability.
复制标题
DOI：
10.1039/c2nr33595f
复制
发表时间：
2013-02
期刊：
影响因子：
6.7
通讯作者：
Changling Yu;Kai Yang;Yu Xie;Q. Fan;Jimmy C. Yu;Qing Shu;Chunying Wang
中科院分区：
文献类型：
--
作者：
Changling Yu;Kai Yang;Yu Xie;Q. Fan;Jimmy C. Yu;Qing Shu;Chunying Wang
贵金属/半导体纳米复合材料在高效电子束中具有重要作用。以Zn（CH（3）COO）（2）·2 H（2）O和HPtCl（4）为前驱体，聚乙二醇6000（PEG-6000）和乙二醇为还原剂和溶剂，在温和的溶剂热条件下制备了具有分级结构的Pt-ZnO纳米复合空心微球。采用X射线粉末衍射（XRD）、氮气物理吸附、扫描电子显微镜（SEM）、能量色散X射线（EDX）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（DRS）和光致发光（PL）发射光谱等手段对合成的ZnO及Pt-ZnO复合纳米晶进行了表征。结果表明，Pt含量对Pt-ZnO复合纳米晶的形貌有很大影响。适当浓度的HPtCl（4）可以制备出由细小的Pt-ZnO纳米晶组装而成的具有良好层次结构的中空Pt-ZnO纳米复合微球。对酸性橙子II染料的光催化降解实验表明，与纯ZnO和相应的Pt沉积ZnO相比，Pt-ZnO微球具有极高的光催化活性和稳定性。空心Pt-ZnO微球的光催化性能主要来源于其独特的纳米结构和嵌入在ZnO纳米晶中的铂纳米颗粒对e（-）/h（+）的低复合率。
Noble metal/semiconductor nanocomposites play an important role in high efficient photocatalysis. Herein, we demonstrate a facile strategy for fabrication of hollow Pt-ZnO nanocomposite microspheres with hierarchical structure under mild solvothermal conditions using Zn (CH(3)COO)(2)·2H(2)O and HPtCl(4) as the precursors, and polyethylene glycol-6000 (PEG-6000) and ethylene glycol as the reducing agent and solvent, respectively. The as-synthesized ZnO and Pt-ZnO composite nanocrystals were well characterized by powder X-ray diffraction (XRD), nitrogen-physical adsorption, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS), and photoluminescence (PL) emission spectroscopy. It was found that Pt content greatly influences the morphology of Pt-ZnO composite nanocrystals. Suitable concentration of HPtCl(4) in the reaction solution system can produce well hierarchically hollow Pt-ZnO nanocomposite microspheres, which are composed of an assembly of fine Pt-ZnO nanocrystals. Photocatalytic tests of the Pt-ZnO microspheres for the degradation of the dye acid orange II revealed extremely high photocatalytic activity and stability compared with those of pure ZnO and corresponding Pt deposited ZnO. The remarkable photocatalytic performance of hollow Pt-ZnO microspheres mainly originated from their unique nanostructures and the low recombination rate of the e(-)/h(+) pairs by the platinum nanoparticles embedded in ZnO nanocrystals.