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Structural and optical properties of Na doped ZnO nanocrystals: Application to solar photocatalysis

机译：Na掺杂的ZnO纳米晶体的结构和光学性质：在太阳光催化中的应用

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摘要

Na doped ZnO nanocrystals (NCs) were successfully produced by sol-gel process and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution TEM (HRTEM), Raman scattering, UV-vis diffuse reflectance spectroscopy and photoluminescence (PL). XRD analysis indicated that all the prepared samples present pure hexagonal wurtzite structure without any Na related phases. The lattice distortion, calculated using Williamson hall equation, induces stress and a reduction of NCs size from 71.4 to 24.5 nm. TEM images showed NCs with hexagonal shape and a rather uniform size distribution. The selected area electron diffraction (SAED) patterns confirmed the high crystal quality along the (101) direction and is consistent with the hexagonal wurtzite structure of ZnO. The Raman spectra are dominated by E-2(high) mode of ZnO. High Na doping shows the occurrence of anomalous local vibrational Raman modes close to 270 and 513 cm(-1) that are related to intrinsic host lattice defects and distortion, respectively. Optical band gap was found to vary with Na content. Photoluminescence (PL) spectra indicate the presence of a high density of defects in ZnO NCs which are mainly oxygen vacancies. Finally, the obtained NCs were used as a photocatalyst to degrade Rhodamine B (RhB) in solution, under solar irradiation. Na doping enhances the photocatalytic activity of ZnO NCs till an optimum concentration of 0.5% where a full degradation was observed after 120 min of sun light irradiation. Furthermore, this sample presents a good cycling stability and reusability. Based on scavangers test, it was found that both superoxide and hydroxyl oxidizing radicals are mainly actives. (C) 2016 Elsevier B.V. All rights reserved.
机译：Na掺杂的ZnO纳米晶（NCs）通过溶胶-凝胶工艺成功制备，并通过X射线衍射（XRD），透射电子显微镜（TEM），高分辨率TEM（HRTEM），拉曼散射，紫外可见漫反射光谱和光致发光（PL）。 XRD分析表明，所有制备的样品均呈现纯正六方纤锌矿结构，无任何Na相关相。使用威廉姆森霍尔方程计算的晶格畸变会引起应力并将NCs尺寸从71.4 nm减小到24.5 nm。 TEM图像显示NC具有六边形形状和相当均匀的尺寸分布。所选区域电子衍射（SAED）图案证实了沿（101）方向的高质量晶体，并且与ZnO的六方纤锌矿结构一致。拉曼光谱受ZnO的E-2（高）模控制。高Na掺杂显示异常的局部振动拉曼模式的发生接近270和513 cm（-1），分别与固有主体晶格缺陷和变形有关。发现光学带隙随Na含量变化。光致发光（PL）光谱表明ZnO NC中存在高密度的缺陷，这些缺陷主要是氧空位。最后，将获得的NCs用作光催化剂以在阳光照射下降解溶液中的若丹明B（RhB）。 Na掺杂可增强ZnO NCs的光催化活性，直至0.5％的最佳浓度，在120分钟的阳光照射下观察到完全降解。此外，该样品具有良好的循环稳定性和可重复使用性。根据稀疏试验，发现超氧自由基和羟基氧化自由基都是主要活性物质。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第2期|1528-1538|共11页
  • 作者

    Tabib Asma; Bouslama Wiem; Sieber Brigitte; Addad Ahmed; Elhouichet Habib; Ferid Mokhtar; Boukherroub Rabah;

  • 作者单位

    Ctr Natl Rech Sci Mat, Lab Physicochim Mat Mineraux & Leurs Applicat, BP 95, Hammam Lif 2050, Tunisia;

    Ctr Natl Rech Sci Mat, Lab Physicochim Mat Mineraux & Leurs Applicat, BP 95, Hammam Lif 2050, Tunisia;

    Univ Lille 1, CNRS 8207, UMR, UMET, F-59665 Villeneuve Dascq, France;

    Univ Lille 1, CNRS 8207, UMR, UMET, F-59665 Villeneuve Dascq, France;

    Ctr Natl Rech Sci Mat, Lab Physicochim Mat Mineraux & Leurs Applicat, BP 95, Hammam Lif 2050, Tunisia|Univ Tunis, Fac Sci Tunis, Dept Phys, Elmanar 2092, Tunisia;

    Ctr Natl Rech Sci Mat, Lab Physicochim Mat Mineraux & Leurs Applicat, BP 95, Hammam Lif 2050, Tunisia;

    CNRS, IEMN, UMR, 8520 Ave Pointcarre,BP 60069, F-59652 Villeneuve Dascq, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ZnO nanocrystals; Na doping; Solgel; Optical properties; Photocatalysis;

    机译：ZnO纳米晶;Na掺杂;Solgel;光学性质;光催化;

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