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Colloidal synthesis of hollow cobalt sulfide nanocrystals

机译：中空硫化钴纳米晶体的胶体合成

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Formation of cobalt sulfide hollow nanocrystals through a mechanism similar to the Kirkendall Effect has been investigated in detail. It is found that performing the reaction at > 120 degrees C leads to fast formation of a single void inside each shell, whereas at room temperature multiple voids are formed within each shell, which can be attributed to strongly temperature-dependent diffusivities for vacancies. The void formation process is dominated by outward diffusion of cobalt cations; still, the occurrence of significant inward transport of sulfur anions can be inferred as the final voids are smaller in diameter than the original cobalt nanocrystals. Comparison of volume distributions for initial and final nanostructures indicates excess apparent volume in shells, implying significant porosity and/or a defective structure. Indirect evidence for fracture of shells during growth at lower temperatures was observed in shell-size statistics and transmission electron microscopy images of as-grown shells. An idealized model of the diffusional process imposes two minimal requirements on material parameters for shell growth to be obtainable within a specific synthetic system.
机译：详细研究了通过类似于柯肯德尔效应的机理形成的硫化钴空心纳米晶体。发现在＞ 120℃下进行反应导致在每个壳内快速形成单个空隙，而在室温下在每个壳内形成多个空隙，这可归因于空位的强烈依赖于温度的扩散性。空隙形成过程主要由钴阳离子的向外扩散所决定。另外，由于最终的孔隙的直径小于原始钴纳米晶体的直径，因此可以推断出硫阴离子显着向内迁移。初始和最终纳米结构的体积分布比较表明，壳中存在明显的表观体积，这表明存在明显的孔隙率和/或结构缺陷。在生长的壳的壳尺寸统计和透射电子显微镜图像中观察到了在较低温度下生长过程中壳破裂的间接证据。扩散过程的理想化模型对要在特定合成系统中获得的壳生长的材料参数提出了两个最低要求。

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