Heterometallic Seed-Mediated Growth of Monodisperse Colloidal Copper Nanorods with Widely Tunable Plasmonic Resonances.,Nano Letters

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Heterometallic Seed-Mediated Growth of Monodisperse Colloidal Copper Nanorods with Widely Tunable Plasmonic Resonances.
Nano Letters ( IF 9.6 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.nanolett.0c02648
Soojin Jeong ₁ , Yang Liu ₁ , Yaxu Zhong ₁ , Xun Zhan ₁ , Yuda Li ₁ , Yi Wang ₁ , Phoebe M Cha ₁ , Jun Chen ₁ , Xingchen Ye ₁

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We report a heterometallic seed-mediated synthesis method for monodisperse penta-twinned Cu nanorods using Au nanocrystals as seeds. Elemental analyses indicate that resultant nanorods consist predominantly of copper with a gold content typically below 3 atom %. The nanorod aspect ratio can be readily adjusted from 2.8 to 13.1 by varying the molar ratio between Au seeds and Cu precursor, resulting in narrow longitudinal plasmon resonances tunable from 762 to 2201 nm. Studies of reaction intermediates reveal that symmetry-breaking is promoted by rapid nanoscale diffusion in Au–Cu alloys and the formation of a gold-rich surface. The growth pathway features coevolving shape and composition whereby nanocrystals become progressively enriched with Cu concomitant with nanorod growth. The availability of uniform colloidal Cu nanorods with widely tunable aspect ratios opens new avenues toward the synthesis of derivative one-dimensional metal nanostructures, and applications in surface-enhanced spectroscopy, bioimaging, and electrocatalysis, among others.

中文翻译：

具有广泛可调等离子体共振的单金属胶体铜纳米棒的杂金属种子介导生长。

我们报告了使用Au纳米晶体作为种子的单分散五股孪晶铜纳米棒的杂金属种子介导的合成方法。元素分析表明，所得的纳米棒主要由铜组成，金含量通常低于3原子％。通过改变金晶种和铜前驱体之间的摩尔比，可以轻松地将纳米棒的宽高比从2.8调整到13.1，从而在762至2201 nm范围内调整窄的纵向等离子体共振。反应中间体的研究表明，对称性破坏是由于Au-Cu合金中快速的纳米级扩散和富金表面的形成而引起的。生长途径的特征在于形状和组成的共同演化，从而伴随着纳米棒的生长，纳米晶体逐渐富含铜。

更新日期：2020-10-15

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