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Synthesis and photocatalytic activity of δ-doped hexagonal NaYF4:Yb,Tm@TiO2/RGO nanocrystals

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Abstract

Enhancement of the luminescence efficiency of up-conversion nanocrystals is essential for the development of near-infrared (NIR)-responsive photocatalysts. In this study, δ-doped hexagonal NaYF4:Yb,Tm@TiO2 (β-NaYF4:Yb,Tm@TiO2) nanocrystals, with the dopant ions Tm3+ and Yb3+ in two-dimensional planes, integrated with reduced graphene oxide (RGO) nanosheets were synthesized by a simple solvothermal process and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), luminescence and ultraviolet absorption spectroscopy. The core, inner shell and outter shell of the δ-doped β-NaYF4:Yb,Tm are in the most efficient host structure phase, with a diameter of 29 nm and thicknesses of 6.4 and 1.2 nm, respectively. The δ-doped β-NaYF4:Yb,Tm exhibits about a 13 times increase in the luminescence intensity than the bare β-NaYF4:Yb,Tm due to the effective reduction of both the surface and inner defects around Yb3+. Moreover, the δ-doped β-NaYF4:Yb,Tm@TiO2/RGO exhibits significantly enhanced photocatalytic activity in the degradation of rhodamine B (RhB) under both NIR and UV irradiation. Our results highlight that the δ-doping construction of the most efficient host structure is promising for developing NIR-responsive photocatalysts.

Graphical abstract: Synthesis and photocatalytic activity of δ-doped hexagonal NaYF4:Yb,Tm@TiO2/RGO nanocrystals

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Publication details

The article was received on 06 Nov 2018, accepted on 30 Dec 2018 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8CE01898G
Citation: CrystEngComm, 2019, Advance Article
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    Synthesis and photocatalytic activity of δ-doped hexagonal NaYF4:Yb,Tm@TiO2/RGO nanocrystals

    H. Zhang, T. Wang, Z. Yang, Y. Liu, J. Zhao, Q. Li and Y. Mao, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C8CE01898G

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