Multifunctional core–shell polymer–inorganic hybrid nanofibers prepared via block copolymer self-assembly
Multifunctional core–shell polymer–inorganic hybrid nanofibers prepared via block copolymer self-assembly
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DOI：
10.1039/c5ra17161j
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
Sunita Sanwaria;Sajan Singh;A. Horechyy;P. Formánek;M. Stamm;R. Srivastava;Bhanu Nandan
中科院分区：
文献类型：
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作者：
Sunita Sanwaria;Sajan Singh;A. Horechyy;P. Formánek;M. Stamm;R. Srivastava;Bhanu Nandan
我们展示了一种简单而稳健的方法，通过嵌段共聚物自组装制备多功能核壳杂化纳米纤维。该方法利用了二嵌段共聚物的两个嵌段的不同化学性质和溶解度以及功能性无机纳米颗粒对嵌段共聚物组分的不同亲和力。在第一步中，用短链聚苯乙烯（PS）配体修饰的银纳米颗粒（Ag）被引入到由PS嵌段构成的聚苯乙烯-嵌段-聚（4-乙烯基吡啶）（PS-b-P4 VP）嵌段共聚物的圆柱形域中。载银的圆柱形域，然后通过使用选择性溶剂溶胀形成P4 VP相的基质分离为纳米纤维。分离的纳米纤维表现出核-壳形态，核由载银PS相组成，壳由P4 VP链组成。纳米纤维的反应性P4 VP壳随后用作沉积第二类型纳米颗粒的主体。第二种类型的纳米颗粒可以直接合成在P4 VP壳上或从预合成的纳米颗粒的水性分散体沉积。在这项工作中，金（Au）和硫化镉（CdS）的纳米粒子沉积在纳米壳。该方法是通用的，原则上，可以扩展到制造的各种组合的目标功能在一个单一的核壳形态。
We demonstrate a simple and robust approach for preparing multifunctional core–shell hybrid nanofibers via block copolymer self-assembly. The approach utilizes the different chemistry and solubilities of the two blocks of a diblock copolymer and different affinity of functional inorganic nanoparticles towards block copolymer constituents. In the first step, the silver nanoparticles (Ag) modified with short-chain polystyrene (PS) ligand are incorporated in the cylindrical domains of a polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) block copolymer, constituted of PS blocks. The Ag-loaded cylindrical domains are then isolated as nanofibers by swelling the matrix forming P4VP phase using a selective solvent. The isolated nanofibers exhibit core–shell morphology with the core constituted of Ag-loaded PS phase and shell consisting of P4VP chains. The reactive P4VP shell of the nanofibers is subsequently used as a host for depositing a second type of nanoparticles. The second type of nanoparticles could be either directly synthesized on the P4VP shell or deposited from an aqueous dispersion of pre-synthesized nanoparticles. In this work, gold (Au) and cadmium sulfide (CdS) nanoparticles were deposited on the nanofiber shell. The approach is versatile and, in principle, could be extended to the fabrication of various combinations of targeted functionalities in a single nanofiber with core–shell morphology.