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Dopant position of Co atom in Zn1−xCoxO nanoparticles studied by extended X-ray absorption fine structure

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Abstract

Zn1−xCoxO nanoparticles were prepared by sol–gel method. The microstructure and dopant position were studied by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and extended X-ray absorption fine structure (EXAFS). The XRD patterns did not show any signal of impurity in the Zn1−xCoxO nanoparticles with Co concentration from x = 0.01 to 0.08. Neither did the HRTEM image for the highest concentration sample with x = 0.08. The nanoparticles have also been investigated by the EXAFS measurements at Co k-edge. The radical distribution functions, the fitting result of bond length and coordination numbers, indicated there was an impurity in the highest Co concentration sample with x = 0.08. Although most of the Co atoms were substituted for Zn sites in ZnO with x = 0.08, a few of Co atoms formed a microstructure similar to Co3O4, which was not found in the XRD and HRTEM. The room temperature ferromagnetic behaviour was found for x = 0.01 sample by superconducting quantum interference device .

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Acknowledgments

The research work was supported by the NUAA Fundamental Research Funds (No. NS2013061).

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Binbin Li, Zhaofeng Chen, FredEdmond Boafo, Honglie Shen & Jian Luo

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  1. Binbin Li
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  2. Zhaofeng Chen
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  3. FredEdmond Boafo
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  4. Honglie Shen
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  5. Jian Luo
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Correspondence to Binbin Li.

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Li, B., Chen, Z., Boafo, F. et al. Dopant position of Co atom in Zn1−xCoxO nanoparticles studied by extended X-ray absorption fine structure. J Sol-Gel Sci Technol 66, 163–167 (2013). https://doi.org/10.1007/s10971-013-2981-1

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  • DOI: https://doi.org/10.1007/s10971-013-2981-1

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