十二烷硒酚的各向异性二维Cu2-x Se纳米晶体及其向CdSe和CuInSe2纳米颗粒的转化。,Chemistry of Materials

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十二烷硒酚的各向异性二维Cu2-x Se纳米晶体及其向CdSe和CuInSe2纳米颗粒的转化。
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-05-09 , DOI: 10.1021/acs.chemmater.8b01143
Anne C Berends ₁ , Ward van der Stam ₁ , Quinten A Akkerman ₁ , Johannes D Meeldijk ₂ , Joost van der Lit ₁ , Celso de Mello Donega ₁

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我们目前使用未开发的无膦硒前体1-十二碳烯醇（DDSe）的合成，具有优异的尺寸和形状控制的胶体各向异性Cu2-x Se纳米晶体（NCs）。该前体与Cu（I）形成层状复合物，从而能够将NC形态从0D多面体调整为高度各向异性的2D形状。随后将Cu2-x Se NCs用作合成后阳离子交换反应中的模板，通过该模板，它们可以成功地转换为CdSe和CuInSe2量子点，纳米片和超薄纳米片。尽管阴离子亚晶格发生了实质性重组，但在阳离子交换反应过程中仍保留了模板六角形纳米片的形状，这导致母体Cu2-x Se NCs的四方umangite晶体结构转换为六方纤锌矿CdSe和CuInSe2，同时改变了纳米片的厚度和横向尺寸。产物NC的晶体学转变和重构归因于母体和产物晶体相的晶胞尺寸和内部成熟过程的组合。这项工作为形状控制的胶体各向异性Cu2-x Se NCs的合理设计提供了新颖的工具，除了具有良好的光电性能外，它还构成了阳离子交换模板的新系列，用于合成纤锌矿CdSe的形状控制的NCs， CuInSe2和其他金属硒化物无法通过直接合成方法获得。而且，

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Anisotropic 2D Cu2-x Se Nanocrystals from Dodecaneselenol and Their Conversion to CdSe and CuInSe2 Nanoparticles.

We present the synthesis of colloidal anisotropic Cu2-x Se nanocrystals (NCs) with excellent size and shape control, using the unexplored phosphine-free selenium precursor 1-dodecaneselenol (DDSe). This precursor forms lamellar complexes with Cu(I) that enable tailoring the NC morphology from 0D polyhedral to highly anisotropic 2D shapes. The Cu2-x Se NCs are subsequently used as templates in postsynthetic cation exchange reactions, through which they are successfully converted to CdSe and CuInSe2 quantum dots, nanoplatelets, and ultrathin nanosheets. The shape of the template hexagonal nanoplatelets is preserved during the cation exchange reaction, despite a substantial reorganization of the anionic sublattice, which leads to conversion of the tetragonal umangite crystal structure of the parent Cu2-x Se NCs into hexagonal wurtzite CdSe and CuInSe2, accompanied by a change of both the thickness and the lateral dimensions of the nanoplatelets. The crystallographic transformation and reconstruction of the product NCs are attributed to a combination of the unit cell dimensionalities of the parent and product crystal phases and an internal ripening process. This work provides novel tools for the rational design of shape-controlled colloidal anisotropic Cu2-x Se NCs, which, besides their promising optoelectronic properties, also constitute a new family of cation exchange templates for the synthesis of shape-controlled NCs of wurtzite CdSe, CuInSe2, and other metal selenides that cannot be attained through direct synthesis approaches. Moreover, the insights provided here are likely applicable also to the direct synthesis of shape-controlled NCs of other metal selenides, since DDSe may be able to form lamellar complexes with several other metals.

更新日期：2018-05-09

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