Effects of Copper Precursor Reactivity on the Shape and Phase of Copper Sulfide Nanocrystals
Effects of Copper Precursor Reactivity on the Shape and Phase of Copper Sulfide Nanocrystals
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DOI：
10.1021/acs.chemmater.7b00461
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发表时间：
2017-03
影响因子：
8.6
通讯作者：
You Zhai;M. Shim
中科院分区：
文献类型：
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作者：
You Zhai;M. Shim
在生长过程中通过容易改变的反应参数来控制胶体纳米晶体的晶体结构和形状和/或刻面是非常理想的。前驱体的选择就是这样一个参数，它可以显着影响可实现的形状和相。在这里，我们研究了胶体硫化铜纳米晶体合成中不同的铜前体如何影响所得的形状和晶相。观察到的一维纳米棒纵横比的减小（最终转变为二维纳米盘）与降低铜前体反应性的预期效果一致。纳米棒在生长的早期阶段主要是辉铜矿，但会发生向朱雷石的相变，并伴随着进一步生长时尖端刻面的变化。相比之下，纳米盘很早就出现在朱莱特相中，并在持续生长后保持这种状态。通过化学氧化增强了各种形状纳米晶体中的局域表面等离子体共振，并且...
Controlling the crystal structure and shape and/or faceting of colloidal nanocrystals during growth through easily variable reaction parameters is highly desirable. The choice of precursors is one such parameter that can significantly impact achievable shapes and phases. Here, we examine how different Cu precursors in the synthesis of colloidal copper sulfide nanocrystals affect the resulting shape and crystal phase. An observed decreasing aspect ratio in one-dimensional nanorods (eventually transitioning to two-dimensional nanodisks) is consistent with the expected effects of decreasing Cu precursor reactivity. Nanorods are predominantly chalcocite at the early stages of growth, but a phase transition to djurleite occurs and is accompanied by a change in tip faceting upon further growth. In contrast, nanodisks appear in the djurleite phase early on and remain so upon continued growth. Localized surface plasmon resonance in various shapes of nanocrystals achieved is enhanced with chemical oxidation, and t...