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首页> 外文期刊>Nanotechnology >Water-based synthesis of ZnSe nanostructures using amphiphilic block copolymer stabilized lyotropic liquid crystals as templates
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Water-based synthesis of ZnSe nanostructures using amphiphilic block copolymer stabilized lyotropic liquid crystals as templates

机译：以两亲性嵌段共聚物稳定的溶致液晶为模板，水基合成ZnSe纳米结构

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摘要

Simultaneous size and shape control of zinc selenide (ZnSe) nanostructures was achieved using lyotropic liquid crystal templates formed by the self-assembly of an amphiphilic block copolymer in the presence of water and a less polar organic solvent. ZnSe quantum dots, hollow nanospheres, nanotubes, and nanolaminates ( parallel nanoplates or free-standing quantum wells) were grown at room temperature in the aqueous phase of a poly( ethylene oxide) - poly( propylene oxide) - poly( ethylene oxide) block copolymer/water/ p-xylene ternary system. The nucleation of ZnSe was facilitated by an irreversible reaction between zinc acetate dissolved in water and hydrogen selenide gas that was allowed to diffuse into the self-assembled template. The nanostructures exhibit good crystallinity under high-resolution transmission electron miscroscopy and quantum confinement effects in their photoluminescence spectra. The shape and size of nanocrystals can be precisely controlled by altering the structure of the templating phase, by tuning the size of the nanodomains, and by changing the concentration of the zinc precursor.
机译：使用由两亲性嵌段共聚物在水和极性较小的有机溶剂存在下自组装形成的溶致液晶模板，可以同时控制硒化锌（ZnSe）纳米结构的尺寸和形状。在室温下，在聚环氧乙烷-聚环氧丙烷-聚环氧乙烷嵌段的水相中生长ZnSe量子点，空心纳米球，纳米管和纳米层压板（平行纳米板或独立式量子阱）共聚物/水/对二甲苯三元体系。溶于水的乙酸锌与硒化氢气体之间的不可逆反应促进了ZnSe的成核，该反应可扩散到自组装模板中。纳米结构在高分辨率透射电子显微镜下显示出良好的结晶度，并且在其光致发光光谱中具有量子限制效应。纳米晶体的形状和尺寸可以通过改变模板相的结构，调整纳米域的尺寸以及改变锌前体的浓度来精确控制。

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