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Efficient tailoring of the surface of upconversion nanoparticles via surface-initiated cationic ring-opening polymerization

机译：通过表面引发的阳离子开环聚合反应对上转换纳米粒子的表面进行高效剪裁

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摘要

Decoration of lanthanide-doped upconversion nanoparticles (UCNPs) with polymers to endow the UCNPs with the desired properties for various applications has attracted considerable attention. Herein, we present for the first time that the surface-initiated cationic ring-opening polymerization (CROP) technique can be employed as an effective tool to decorate UCNP with diverse polymers, as exemplified by the successful grafting of hydrophobic poly(epsilon-caprolactone) and hydrophilic hyperbranched polyglycerol from the surface of NaYF4:Yb/Er UCNP. Furthermore, the content of the grafted polymer associated with the thickness of the polymer shell can be controlled by adjusting the feed ratio. Benefiting from the introduction of the polymer shell, the resulting UCNP/polymer nanohybrids simultaneously show strong upconversion luminescence, tunable solution dispersibility, enhanced solution processibility, high biocompatibility, and favorable surface functionality, which make them promising for various applications such as fabrication of light-emitting polymer composites, cellular imaging, and drug delivery. Considering the high robustness and flexibility of the CROP technique, this investigation opens up new avenues for decorating UCNPs with diverse polymers to meet various application requirements.
机译：用聚合物装饰镧系元素掺杂的上转换纳米颗粒（UCNPs）以赋予UCNPs各种应用所需的性能已经引起了相当大的关注。在本文中，我们首次提出表面引发的阳离子开环聚合（CROP）技术可以用作用各种聚合物修饰UCNP的有效工具，例如成功接枝了疏水性聚（ε-己内酯） NaYF4：Yb / Er UCNP表面的亲水性超支化聚甘油。此外，可以通过调节进料比来控制与聚合物壳的厚度相关的接枝聚合物的含量。得益于聚合物壳的引入，所得的UCNP /聚合物纳米杂化物同时显示出强的上转换发光，可调节的溶液分散性，增强的溶液可加工性，高生物相容性和良好的表面功能性，这使其在各种应用（例如光制造）中很有希望发射聚合物复合材料，细胞成像和药物递送。考虑到CROP技术的高鲁棒性和灵活性，这项研究为使用各种聚合物装饰UCNP以满足各种应用需求开辟了新途径。

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