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Solvent thermal synthesis and gas-sensing properties of Fe-doped ZnO

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Abstract

In this study, pure ZnO microbullets, ZnO–ZnFe2O4 composite, and ZnO–Fe2O3–ZnFe2O4 composite with micron structured balloons, rods, and particles were prepared by a simple solvent thermal process using methanol or ethanol as solvents. The influence of solvents on the composition and morphology of the products was studied, and their gas-sensing properties were also investigated. The morphology of ZnO microbullets synthesized in ethanol is similar to but more uniform than that of ZnO microbullets synthesized in methanol. The Fe-doped ZnO synthesized in ethanol contains many micron particles homogeneously dispersing on the surface of the microbullets, which is composed of hexagonal wurtzite ZnO and franklinite ZnFe2O4, while Fe-doped ZnO prepared in methanol consists of micron structured balloons, rods, and particles, which is composed of hexagonal wurtzite ZnO, hematite Fe2O3, and franklinite ZnFe2O4. Compared with pure ZnO and ZnO–ZnFe2O4 composite, the ZnO–Fe2O3–ZnFe2O4 composite presented high response, rapid response/recovery characteristics, good selectivity, and excellent stability to acetone at relatively low operating temperature of 190 °C. This sensor could detect acetone in wide range of 1–1000 ppm, which was expected to be a promising gas sensor for detecting acetone.

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Acknowledgements

The financial support of the work by the Research Fund for the Doctoral Program of Higher Education (RFDP) under grant 20070561008 and Natural Science Foundation of China under grant 20773041 is greatly acknowledged. J.F. Zhou would like to thank Student Research Program of SCUT for the financial aid.

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Authors and Affiliations

  1. Nano Science Research Center, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, People’s Republic of China

    Wen-Hui Zhang, Wei-De Zhang & Jue-Fei Zhou

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  1. Wen-Hui Zhang
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  2. Wei-De Zhang
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  3. Jue-Fei Zhou
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Correspondence to Wei-De Zhang.

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Zhang, WH., Zhang, WD. & Zhou, JF. Solvent thermal synthesis and gas-sensing properties of Fe-doped ZnO. J Mater Sci 45, 209–215 (2010). https://doi.org/10.1007/s10853-009-3920-y

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