Elucidating the role of seed structure in the heterometallic seeded growth of copper-based nanocrystals
Elucidating the role of seed structure in the heterometallic seeded growth of copper-based nanocrystals
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DOI：
10.3389/fnano.2023.1163390
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发表时间：
2023-05-15
影响因子：
--
通讯作者：
Ye, Xingchen
中科院分区：
文献类型：
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作者：
Jeong, Soojin;Skalla, Rebecca X.;Ye, Xingchen
晶种介导法是一种制备多金属纳米晶的多用途方法。然而，许多基本的问题仍然是如何的结构和化学性质的控制反应途径，特别是在高温下的非水合成。在此，我们阐明了表面配位体和结晶度的Au籽晶的异质金属籽晶生长的铜基纳米晶体的作用。我们发现，弱配位的配体是至关重要的，以促进Au和Cu之间的扩散，这使得随后的一维生长的Cu。用单晶体取代多孪晶Au种子，改变了生长途径，产生了异质结构的纳米晶体。我们的工作说明了精确控制的种子特性的预测合成结构复杂的多金属纳米晶体的重要性。
Seed-mediated synthesis is a versatile method to prepare multimetallic nanocrystals for diverse applications. However, many fundamental questions remain on how the structural and chemical properties of nanocrystal seeds control the reaction pathways, especially for nonaqueous synthesis at elevated temperatures. Herein, we elucidate the role of surface ligands and crystallinity of Au nanocrystal seeds on the heterometallic seeded growth of Cu-based nanocrystals. We found that weakly coordinating ligands are critical to facilitate the diffusion between Au and Cu, which enables subsequent one-dimensional growth of Cu. Replacing multiple-twinned Au seeds with single-crystalline ones switched the growth pathway to produce heterostructured nanocrystals. Our work illustrates the importance of precise control of seed characteristics for the predictive synthesis of structurally complex multimetallic nanocrystals.