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Synthesis and characterization of zinc oxide nanopowder doped with copper by microwave assisted polyol method.

机译：微波辅助多元醇法合成掺杂铜的氧化锌纳米粉及其表征。

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摘要

In this work, pure and Cu-doped ZnO samples (Zn1-xCu xO, x=0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14) have been prepared using microwave assisted polyol method from zinc and copper acetates dissolved into diethylene glycol (DEG) at 180 °C and 200 °C.;The structure, morphology and optical properties of synthesized pure and doped samples have been characterized by X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS), Field Emission Scanning Electron Microscopy (FESEM), and UV-visible light spectroscopy (UV-vis).;XRD results showed that pure ZnO and Cu-doped ZnO synthesized by microwave assisted polyol method at 180 °C and 200 °C have a hexagonal structure. The results showed that the grain size increases with increasing temperature whereas it decreases with increasing Cu doping concentration. In the present investigation we did not observe any noticeable change in the lattice parameters of Cu- doped ZnO for all synthesized samples.;X-Ray Photoelectron Spectroscopy (XPS) technique has provided elemental and chemical information of Cu-doped ZnO samples and the results emphasized the presence of Cu+2 within Zn+2 crystals.;FESEM investigation of pure ZnO and Cu-doped ZnO synthesized by microwave assisted polyol method at 180ºC and 200ºC showed spherical primary particles consisting of agglomerated nanoparticles. The samples synthesized at 180ºC had spherical shape more regularity than those samples synthesized at 200ºC.;EDX spectra clearly confirm the chemical purity of the investigated samples. The chemical composition of samples indicates two components; Zn and O for pure samples whereas three components: Zn, Cu and O for doped ZnO samples.;The effect of doping on the band gap of ZnO was studied by UV-visible diffuse reflectance spectroscopy. The results showed that the energy band gap of synthesized ZnO decreases very slightly from 3.29 to 3.26 eV with increasing Cu doping concentration within the ZnO samples.
机译：在这项工作中，使用微波辅助多元醇法，将溶解在锌和乙酸铜中的纯锌和铜掺杂的ZnO样品（Zn1-xCu xO，x = 0，0.02，0.04，0.06，0.08，0.10，0.12，0.14）制备出来。二甘醇（DEG）在180°C和200°C下;已通过X射线衍射（XRD），X射线光电子能谱（XPS），场对合成的纯样品和掺杂样品的结构，形态和光学性质进行了表征XRD结果表明，微波辅助多元醇法在180°C和200°C下合成的纯ZnO和掺杂Cu的ZnO具有六方结构。 。结果表明，晶粒尺寸随温度的升高而增加，而随铜掺杂浓度的增加而减小。在本研究中，我们没有观察到所有合成样品中Cu掺杂ZnO的晶格参数有任何明显的变化。； X射线光电子能谱（XPS）技术提供了Cu掺杂ZnO样品的元素和化学信息以及结果强调了在Zn + 2晶体中存在Cu +2。FESEM研究了在180ºC和200ºC微波辅助多元醇法合成的纯ZnO和Cu掺杂的ZnO中，球形原始颗粒由团聚的纳米颗粒组成。在180ºC合成的样品比在200ºC合成的样品具有更规则的球形形状； EDX光谱清楚地证实了所研究样品的化学纯度。样品的化学成分表明有两个成分： Zn和O分别为纯样品，而掺杂的ZnO样品则为Zn，Cu和O三种成分。通过紫外可见漫反射光谱研究了掺杂对ZnO带隙的影响。结果表明，随着ZnO样品中Cu掺杂浓度的增加，合成ZnO的能带隙从3.29 eV减小至3.26 eV。

著录项

  • 作者

    Al-Nahari, Esam Gunaid Abdo.;

  • 作者单位

    King Fahd University of Petroleum and Minerals (Saudi Arabia).;

  • 授予单位 King Fahd University of Petroleum and Minerals (Saudi Arabia).;
  • 学科 Physics Condensed Matter.;Nanotechnology.
  • 学位 M.S.
  • 年度 2012
  • 页码 114 p.
  • 总页数 114
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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