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Fluorescent-magnetic dual-encoded nanospheres: A promising tool for fast-simultaneous-addressable high-throughput analysis

机译:荧光磁性双编码纳米球:用于快速同时寻址的高通量分析的有前途的工具

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摘要

Bead-based optical encoding or magnetic encoding techniques are promising in high-throughput multiplexed detection and separation of numerous species under complicated conditions. Therefore, a self-assembly strategy implemented in an organic solvent is put forward to fabricate fluorescent-magnetic dual-encoded nanospheres. Briefly, hydrophobic trioctylphosphine oxide-capped CdSe/ZnS quantum dots (QDs) and oleic acid-capped nano-γ-Fe _2O _3 magnetic particles are directly, selectively and controllably assembled on branched poly(ethylene imine)-coated nanospheres without any pretreatment, which is crucial to keep the high quantum yield of QDs and good dispersibility of γ-Fe _2O _3. Owing to the tunability of coating amounts of QDs and γ-Fe _2O _3 as well as controllable fluorescent emissions of deposited-QDs, dual-encoded nanospheres with different photoluminescent emissions and gradient magnetic susceptibility are constructed. Using this improved layer-by-layer self-assembly approach, deposition of hydrophobic nanoparticles onto hydrophilic carriers in organic media can be easily realized; meanwhile, fluorescent-magnetic dual-functional nanospheres can be further equipped with readable optical and magnetic addresses. The resultant fluorescent-magnetic dual-encoded nanospheres possess both the unique optical properties of QDs and the superparamagnetic properties of γ-Fe _2O _3, exhibiting good monodispersibility, huge encoding capacity and nanoscale particle size. Compared with the encoded microbeads reported by others, the nanometre scale of the dual-encoded nanospheres gives them minimum steric hindrance and higher flexibility.
机译:基于珠的光学编码或磁性编码技术有望在复杂条件下对多种物种进行高通量多路复用检测和分离。因此,提出了一种在有机溶剂中实现的自组装策略来制备荧光双编码纳米球。简而言之,将疏水三辛基氧化膦封端的CdSe / ZnS量子点(QDs)和油酸封端的纳米γ-Fe_2O _3磁性颗粒直接,选择性和可控制地组装在支化的聚亚乙基亚胺涂层的纳米球上,无需任何预处理,这对于保持量子点的高量子产率和γ-Fe_2O _3的良好分散性至关重要。由于量子点和γ-Fe_2O _3的涂覆量的可调性以及沉积量子点的可控荧光发射,构建了具有不同光致发光发射和梯度磁化率的双编码纳米球。使用这种改进的逐层自组装方法,可以轻松实现将疏水性纳米颗粒沉积到有机介质中的亲水性载体上。同时,荧光磁性双功能纳米球可以进一步配备可读的光学和磁性地址。所得的荧光磁双编码纳米球既具有量子点的独特光学性质,又具有γ-Fe_2O _3的超顺磁性质,具​​有良好的单分散性,巨大的编码能力和纳米级粒径。与其他人报道的编码微珠相比,双编码纳米球的纳米尺度使它们的空间位阻最小,柔韧性更高。

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