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When Ligand Exchange Leads to Ion Exchange: Nanocrystal Facets Dictate the Outcome
ACS Nano ( IF 17.1 ) Pub Date : 2017-11-02 00:00:00 , DOI: 10.1021/acsnano.7b05534
Indika K. Hewavitharana 1 , Stephanie L. Brock 1
Affiliation  

This study demonstrates that ligand exchange of nanocrystals (NCs) is not always an innocuous process, but can lead to facile (room temperature) ion exchange, depending on the surface crystal faceting. Rock salt PbTe NCs prepared as cubes with neutral facets undergo room-temperature ligand exchange with sulfide ions, whereas cuboctahedron-shaped particles with neutral {100} and polar {111} facets are transformed to PbS, driven by ion exchange along the ⟨111⟩ direction. Likewise, cation exchange (with Ag+) occurs rapidly for cuboctahedra, whereas cubes remain inert. This dramatic difference is attributed to the relative surface area of {111} facets that promote rapid ion exchange and shows how facet engineering is a powerful knob for the control of reaction pathways in nanoparticles.

中文翻译:

当配体交换导致离子交换时:纳米晶面决定结果

这项研究表明,纳米晶体(NCs)的配体交换并不总是一个无害的过程,但是取决于表面晶体的刻面,它可以导致便捷的(室温)离子交换。制备成具有中性面的立方体的盐岩PbTe NCs在室温下与硫化物离子进行配体交换,而具有中性{100}和极性{111}面的立方八面体形状的颗粒在沿⟨111的离子交换作用下转变为PbS。方向。同样,立方八面体的阳离子交换(与Ag +)迅速发生,而立方体保持惰性。这种巨大的差异归因于促进快速离子交换的{111}小平面的相对表面积,并显示了小平面工程如何成为控制纳米粒子中反应路径的强大旋钮。
更新日期:2017-11-03
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