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The synthesis of C, N-codoped TiO2 hollow spheres by a dual-frequency atmospheric pressure cold plasma jet

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Abstract

Titanium dioxide has been widely applied in many fields, but the photon utilization efficiency of it was low because of the wide band gap, amounting to 3.2 eV. Many studies have shown that doping TiO2 with nonmetals (N, S, C and so on) could narrow the TiO2 band gap. In the paper, the titanium tetraisopropoxide (TTIP) used as the precursor in the argon/oxygen which was driven by dual-frequency (100 kHz/100 MHz) atmospheric pressure plasma jet via tuning the nitrogen flow ratio was investigated. The structures of the synthetic C, N-codoped TiO2 hollow sphere were investigated by X-ray diffraction and Raman shift spectroscopy. The results indicated that the synthetic crystals consist of anatase and rutile. The scanning electron microscopy and transmission electron microscopy demonstrated that the synthetic crystals were hollow spheres. The elements of the C, N-codoped TiO2 were characterized by energy-disperse spectroscopy. The patterns reveal that carbon and nitrogen are incorporated in the deposited TiO2 crystal. The C element increased but N element decreased with the increase in nitrogen gas flow. The chemical bond and composition of TiO2 were characterized by X-ray photoelectron spectroscopy, which indicates that C is derived from the dissociation of tetraisopropoxide and N element is originated from the electron ionization of N2 molecules. The optical absorption of these samples was detected by UV–Vis absorbance spectra. The results indicated that the band gap of S1 and S2 is 2.91 and 3.10 eV, respectively. Excited species of the plasma discharge were diagnosed by optical emission spectroscopy.

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Acknowledgements

The authors gratefully acknowledge the support provided by Project of Natural Science Foundation of China (11665021).

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Authors and Affiliations

  1. Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, 730070, China

    Qianghua Yuan, Yang Li & Guiqin Yin

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  1. Qianghua Yuan
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  2. Yang Li
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  3. Guiqin Yin
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Correspondence to Qianghua Yuan.

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Yuan, Q., Li, Y. & Yin, G. The synthesis of C, N-codoped TiO2 hollow spheres by a dual-frequency atmospheric pressure cold plasma jet. J Mater Sci 54, 12488–12497 (2019). https://doi.org/10.1007/s10853-019-03804-1

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  • DOI: https://doi.org/10.1007/s10853-019-03804-1

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