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Construction of PbSe hierarchical superstructures via an alkaline etching method

机译：通过碱蚀法构建PbSe分层超结构

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摘要

Various PbSe hierarchical superstructures, including the PbSe octopod hierarchitectures densely/loosely stacked by cubic building units, and PbSe windowlike hierarchitectures, have been achieved from the PbSe cubes by the alkaline etching methodology. This work indicates that the complicated hierarchical superstructures could also be obtained through a "top-down" way on the basis of an etching process, which is different from the previous opinion that the hierarchitectures could only be assembled by the in situ produced building blocks through the "bottom-up" way. Herein, the in situ synthesized PbSe cubes were etched to form various hierarchical superstructures in the presence or absence of the organic molecule 1,10-phenanthroline (1,10-phen). Without 1,10-phen, PbSe windowlike hierarchitectures could be produced because OH- preferred to attack the {100} faces of PbSe cubes. Meanwhile, densely/loosely stacked PbSe octopod hierarchitectures were obtained with the presence of 1,10-phen, which preferred to cover the {100} faces of PbSe cubes and hence protect them from being etched by OH-. On the basis of our experiment results, the competition between protection of 1,10-phen and etching of OH-, and the recrystallization worked synergically and took responsibility for the formation of the final products. This facile etching route could also be extended to the preparation of other hierarchical superstructures of functional inorganic materials.
机译：已通过碱性蚀刻方法从PbSe立方体中获得了各种PbSe层次上层结构，包括由立方砌体单元密集/松散堆叠的PbSe章鱼层次结构和PbSe窗口状层次结构。这项工作表明，在蚀刻工艺的基础上，也可以通过“自上而下”的方式获得复杂的层次上层建筑，这与以前的观点不同，即以前的观点认为，层次结构只能由现场生产的构件通过“自下而上”的方式。在此，在存在或不存在有机分子1，10-菲咯啉（1，10-phen）的情况下，蚀刻原位合成的PbSe立方体以形成各种分层的超结构。如果没有1,10-phen，则可能会生成PbSe窗口状层次结构，因为OH-会优先攻击PbSe立方体的{100}面。同时，在存在1,10-phen的情况下，获得了密集/松散堆积的PbSe章鱼结构，它优选覆盖PbSe立方体的{100}面，因此可以防止它们被OH-腐蚀。根据我们的实验结果，保护1,10-phen和OH-的刻蚀之间的竞争与重结晶之间的协同作用是最终产物形成的原因。这种简便的蚀刻路线也可以扩展到功能性无机材料的其他分层超结构的制备。

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