Research Article

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2022, 15(2): 1199–1204

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https://doi.org/10.1007/s12274-021-3625-3

Continuous synthesis of ultrasmall core–shell upconversion nanoparticles via a flow chemistry method

Di Liu§, Junyu Yan§, Kai Wang (✉), Yundong Wang (✉), and Guangsheng Luo

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The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
§Di Liu and Junyu Yan contributed equally to this work.

Keywords: sodium rare earth tetrafluoride, upconversion nanoparticle, core-shell structure, flow chemistry synthesis
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A continuous synthesis method for the less than 10 nm core–shell upconversion nanoparticles was developed via coiled tube embedded flask reactors and a flow solvothermal co-participation reaction up to 300 °C. Fast nucleation of hexagonal nanocrystals in less than 9 min residence time was achieved owing to the excellent heating ability of the reactors, and a two-step reaction strategy was created for the synthesis of β-NaYF4:Gd,Yb,Er/Ho/Tm@NaYF4 particles without intermediate purification.
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Continuous synthesis of ultrasmall core–shell upconversion nanoparticles via a flow chemistry method. Nano Res. 2022, 15(2): 1199–1204 https://doi.org/10.1007/s12274-021-3625-3

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