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Structure and gas sensing properties of nanocrystalline Fe-doped ZnO films prepared by spin coating method

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Abstract

Nanocrystalline Fe-doped ZnO films were obtained by spin coating, using zinc acetate and iron acetate as starting materials and N,N-dimethylformamide as solvent. Characteristic XRD patterns indicate that the films under study are single phase with the ZnO-like wurtzite structure. There are not any secondary phases and Fe2+ as well as Fe3+ substitutes for Zn2+ of ZnO host. Atomic force microscopy analysis revealed that the studied films are characterized by high-density columnar structure and the incorporation of Fe atoms into the ZnO lattice modified the surface morphology. The sensitivity, at three different gases, was investigated and it was observed that acetone is the test gas that produces the most significant changes in the electrical resistance of all studied samples. Experimental results indicate that the optimum operating temperature increases for Fe-doped ZnO films by comparison with the undoped one. Also, the values of sensitivity were found to depend on the dopant concentration in ZnO films.

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Acknowledgements

We would like to thank Dr. V. Nica and Dr. M. Dobromir for to carry out XRD and XPS investigations.

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Authors and Affiliations

  1. Faculty of Physics, Alexandru Ioan Cuza University of Iasi, 11 Carol I Blvd., 700506, Iasi, Romania

    A. P. Rambu, C. Doroftei & F. Iacomi

  2. Petru Poni Institute of Macromolecular Chemistry, Grigore Ghica Vodă 41 A, 700487, Iasi, Romania

    L. Ursu

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  1. A. P. Rambu
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  2. C. Doroftei
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  3. L. Ursu
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  4. F. Iacomi
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Correspondence to A. P. Rambu.

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Rambu, A.P., Doroftei, C., Ursu, L. et al. Structure and gas sensing properties of nanocrystalline Fe-doped ZnO films prepared by spin coating method. J Mater Sci 48, 4305–4312 (2013). https://doi.org/10.1007/s10853-013-7245-5

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  • DOI: https://doi.org/10.1007/s10853-013-7245-5

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