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    • Core-multishell Lanthanide-Doped Nanocomposite by One-Pot Synthesis for NIR-II Emissions-Based Temperature Sensing

    Hongting Zheng,Jintao Zhang,Zihan Wang,Wuji Zhang,Li Tian,Fuli Zhao,Jinchang Yin,Yuanzhi Shao

    Journal of Alloys and Compounds（2022）SCI 2区

    Sun Yat Sen Univ

    Cited 4|Views22
    Abstract
    The performances of nanothermometers based on visible light are inevitably degraded in biological applications because visible light is greatly weakened after passing through tissues. Herein, in view of the second biological optical transparency window, a type of tailored core-multishell lanthanide-doped nanocomposite was synthesized with facile one-pot coprecipitation method to supplant complex method demanding stepwise thermal decomposition. Proved to have excellent dispersibility, crystallinity, stability and luminous efficiency, the nanocomposite is capable of enhanced NIR-II emissions and a broad temperature detection scope based on three kinds of spectral parameters relevant to its unique core-multishell structure. The maximum absolute and relative sensitivity of luminescence intensity ratios in low temperature range can reach up to 11.3% K−1 and 1.27% K−1, respectively, and a theoretical derivation is provided to address the peculiar V-shaped trend of NIR-II luminescence lifetime. The prepared nanocomposite can serve as a promising candidate for optical thermometer in the fields of cryoablation of diseased tissues and industrial applications in strong magnetic or radiofrequency fields.
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    Key words
    Rare earth,Luminescence,Second near-infrared window (NIR-II),Nanothermometry,Core-shell,One-pot synthesis
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    【要点】：本研究提出了一种基于近红外二区(NIR-II)发射的温敏核心-多层结构的稀土掺杂纳米复合材料，通过一锅共沉淀法简便合成，用于生物组织内的高效温度传感。
    

    【方法】：采用一锅共沉淀法合成了具有优异分散性、结晶性、稳定性和发光效率的核心-多层结构稀土掺杂纳米复合材料。
    

    【实验】：在研究中，实验使用了该纳米复合材料，并通过检测其与特殊核心-多层结构相关的三种光谱参数，实现了基于NIR-II发射的温度传感。实验结果表明，在低温范围内，发光强度比的最大绝对灵敏度和相对灵敏度分别可达11.3% K−1和1.27% K−1，并通过理论推导解释了NIR-II发光寿命特有的V形趋势。数据集名称在文中未提及。