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One-step rapid synthesis of ultrafine γ-Ga2O3 nanocrystals by microwave hydrothermal method in ammonium hydroxide medium

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Abstract

Ultrafine nanocrystals of γ-gallium oxide (γ-Ga2O3) were rapidly synthesized via microwave hydrothermal method at 140 °C, in which Ga(NO3)3 was used as the gallium source and urea was the precipitant. The samples were characterized by X-ray diffraction (XRD), ultraviolet–visible absorption spectroscopy (UV–Vis), transmission electron microscopy (TEM), nitrogen physisorption and photoluminescence spectroscopy (PL). The crystallite size of ultrafine spinel γ-Ga2O3 was in the range from 4 to 5 nm and the optical bandgap was 4.61 eV. To improve the crystallinity, the ultrafine γ-Ga2O3 nanocrystals were calcined at 300–700 °C further. The ultrafine γ-Ga2O3 calcined at 500 °C (calcined-γ-Ga2O3) still remained the metastable γ-phase with relatively high crystallinity and the crystallite size around 5–7 nm. Photocatalytic performances of the synthesized samples were also evaluated by the degradation of rhodamine B (RhB). Results revealed that the ultrafine γ-Ga2O3 and the calcined-γ-Ga2O3 samples exhibited high photocatalytic efficiencies of 68.2 and 90.7%, respectively.

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Acknowledgements

Projects were supported by the Science and Technology Project of the Education Department of Heilongjiang Province (No. 12531526) for which the authors are very grateful.

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Authors and Affiliations

  1. Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education; Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion, College of Heilongjiang Province; School of Chemistry and Materials Science, Heilongjiang University, Xue Fu Road No. 74, Nan-gang, Harbin, 150080, People’s Republic of China

    Lu Cui, Hong Wang, Baifu Xin & Guijie Mao

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  1. Lu Cui
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  2. Hong Wang
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  3. Baifu Xin
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Correspondence to Hong Wang or Baifu Xin.

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Cui, L., Wang, H., Xin, B. et al. One-step rapid synthesis of ultrafine γ-Ga2O3 nanocrystals by microwave hydrothermal method in ammonium hydroxide medium. Appl. Phys. A 123, 634 (2017). https://doi.org/10.1007/s00339-017-1250-5

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  • DOI: https://doi.org/10.1007/s00339-017-1250-5

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