Structure and Optical Properties of Co-Doped ZnO Nanopowder

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Structure and Optical Properties of Co-Doped ZnO Nanopowder

更新时间：2025-07-09

- Structure and Optical Properties of Co-Doped ZnO Nanopowder
- Vol. 45, Issue 7, Pages: 65-69(2011)
- 作者机构：
  
  1. 南京工业大学材料科学与工程学院,南京,210009
  2. 国家纳米科学中心,北京,100190
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB34
- Online First：10 July 2011，
  
  Published：2011
- 稿件说明：
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Structure and Optical Properties of Co-Doped ZnO Nanopowder[J]. 2011, 45(7): 65-69.
DOI：

Structure and Optical Properties of Co-Doped ZnO Nanopowder[J]. 2011, 45(7): 65-69. DOI：

摘要

采用溶胶凝胶法制备了掺杂Co

的ZnO纳米粉体

并利用X射线衍射、X射线光电子能谱、扫描电子显微镜、紫外可见吸收光谱和光致发光光谱等对其结构和光学性质进行了表征.结果表明:Co以二价离子Co

的形式掺杂进入ZnO晶格

且所得Co掺杂ZnO纳米粉体仍为六角纤锌矿型结构; 纳米粉体的光学带隙随掺杂量的增加逐渐变窄

并且在紫外吸收谱上出现了3个明显的特征吸收峰; 由室温光致发光光谱可知

随着Co

掺杂浓度的增加

ZnO的荧光强度逐渐变弱.

Abstract

Zinc oxide nanopowder doped with Co

(Zn

1-x

0.01 ≤ x ≤ 0.05)was prepared with sol-gel method

and the structure and optical properties of resultant Zn

1-x

O were investigated by X-ray diffraction

UV-vis absorption spectra and photoluminescence spectra. The results indicate that ZnO nanocrystal is endowed with a hexagonal wurtzite structure following the replacement of Zn

by Co

into the lattice. UV-vis absorption spectra show a red shift of optical band gap(E

)with increasing doping concentration. Moreover

three characteristic absorption peaks appear around 567

600 and 656 nm in the absorption spectra. UV band(384 nm)

blue-green band(440 nm)and green band(～490 nm)are observed in the photoluminescence spectra for all samples. Co

doping can cause reduction in the intensity of photoluminescence emission due to accumulation of local states at th

e interface and nonradiative recombination. This quenching effect is enhanced with the increase of Co doping density.

关键词

Keywords

references

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