One-pot synthesis of an inorganic heterostructure: uniform occlusion of magnetite nanoparticles within calcite single crystals
One-pot synthesis of an inorganic heterostructure: uniform occlusion of magnetite nanoparticles within calcite single crystals
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DOI：
10.1039/c3sc52615a
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发表时间：
2014-01-01
期刊：
影响因子：
8.4
通讯作者：
Meldrum, Fiona C.
中科院分区：
文献类型：
--
作者：
Kulak, Alexander N.;Semsarilar, Mona;Meldrum, Fiona C.
描述了一种简便的一锅法用于形成新型异质结构，其中无机纳米颗粒均匀地分布在整个无机单晶基质中。我们的策略使用用聚（4-苯乙烯磺酸钠）-聚（甲基丙烯酸）[PNaStS-PMAA]二嵌段共聚物官能化的纳米颗粒作为可溶性晶体生长添加剂。这种共聚物起着许多重要的作用。PMAA锚嵌段被物理吸附到无机纳米颗粒上，而PNaStS嵌段充当电空间稳定剂并确保纳米颗粒在晶体生长溶液中保持其胶体稳定性。此外，该强酸嵌段促进与纳米颗粒和主体晶体两者的结合，这控制了纳米颗粒在主体晶格内的掺入。我们表明，这种方法可以用来实现至少12重量%的共聚物包覆的磁铁矿颗粒内的方解石单晶的封装负载。透射电子显微镜显示，这些纳米粒子均匀分布在整个方解石，晶格保持其连续性周围嵌入的磁铁矿颗粒。这些方解石/磁铁矿纳米复合材料的表征证实了它们的磁性。这种新的实验方法预计是相当普遍的，这样一个小家族的嵌段共聚物可以用来驱动广泛的预先制备的纳米粒子到主机晶体的掺入，提供具有对比性能的相的紧密混合，同时限制纳米粒子聚集和迁移。
A facile one-pot method is described for the formation of novel heterostructures in which inorganic nanoparticles are homogeneously distributed throughout an inorganic single crystal matrix. Our strategy uses nanoparticles functionalised with a poly(sodium 4-styrenesulphonate)-poly(methacrylic acid) [PNaStS-PMAA] diblock copolymer as a soluble crystal growth additive. This copolymer plays a number of essential roles. The PMAA anchor block is physically adsorbed onto the inorganic nanoparticles, while the PNaStS block acts as an electrosteric stabiliser and ensures that the nanoparticles retain their colloidal stability in the crystal growth solution. In addition, this strong acid block promotes binding to both the nanoparticles and the host crystal, which controls nanoparticle incorporation within the host crystal lattice. We show that this approach can be used to achieve encapsulation loadings of at least 12 wt% copolymer-coated magnetite particles within calcite single crystals. Transmission electron microscopy shows that these nanoparticles are uniformly distributed throughout the calcite, and that the crystal lattice retains its continuity around the embedded magnetite particles. Characterisation of these calcite/magnetite nanocomposites confirmed their magnetic properties. This new experimental approach is expected to be quite general, such that a small family of block copolymers could be used to drive the incorporation of a wide range of pre-prepared nanoparticles into host crystals, giving intimate mixing of phases with contrasting properties, while limiting nanoparticle aggregation and migration.