Epitaxially aligned single-crystal gold nanoplates formed in large-area arrays at high yield
Epitaxially aligned single-crystal gold nanoplates formed in large-area arrays at high yield
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DOI：
10.1007/s12274-021-3473-1
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发表时间：
2021-06
期刊：
影响因子：
9.9
通讯作者：
Trevor B. Demille;R. D. Neal;Arin S. Preston;Zijuan Liang;A. Oliver;R. Hughes;S. Neretina
中科院分区：
文献类型：
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作者：
Trevor B. Demille;R. D. Neal;Arin S. Preston;Zijuan Liang;A. Oliver;R. Hughes;S. Neretina
具有单晶特性的精心定制的纳米材料为片上等离子体器件提供了理想的构建模块。尽管胶体方法已经证明了对此类结构合成的掌握，但事实证明，以高度确定的方式将这些相同的纳米材料部署在基材表面上并确保对位置和方向的精确控制非常困难。在此，我们展示了在平方厘米面积的阵列中直接在基底表面上进行金纳米板的室温双试剂液相种子介导合成。该合成依赖于台式光刻和定向组装工艺，产生单晶金种子，该单晶金种子既表达了与底层衬底的外延关系，也表达了促进二维生长模式所需的内部缺陷结构。所得结构具有高度多面性，并且由于籽晶衬底外延作用于生长的纳米板，因此在衬底表面上一致排列。使用后处理超声处理程序可将纳米板产量提高至高达 95%，该处理程序选择性地从基底表面去除少量不规则形状的纳米结构，从而产生不受影响的等离子体响应。因此，这项工作推进了将单晶纳米材料与基于晶圆的技术集成所需的技术，并在用纳米板几何形状定义大面积等离子体结构阵列方面提供了领先的能力。
Well-tailored nanomaterials with a single-crystal character provide ideal building blocks for on-chip plasmonic devices. Although colloidal methods have demonstrated mastery over the synthesis of such structures, it has proven quite difficult to deploy these same nanomaterials on substrate surfaces in a highly deterministic manner where precise control over position and orientation is ensured. Herein, we demonstrate a room-temperature two-reagent liquid-phase seed-mediated synthesis of gold nanoplates directly on substrate surfaces in arrays over a square-centimeter area. The synthesis is reliant on benchtop lithographic and directed-assembly processes that give rise to single-crystal seeds of gold that express both an epitaxial relationship with the underlying substrate and the internal defect structure required to promote a two-dimensional growth mode. The resulting structures are highly faceted and, because seed-substrate epitaxy is imposed upon the growing nanoplates, are identically aligned on the substrate surface. Nanoplate yields are increased to values as high as 95% using a post-processing sonication procedure that selectively removes a small population of irregularly shaped nanostructures from the substrate surface, and in doing so, gives rise to an uncompromised plasmonic response. The work, therefore, advances the techniques needed to integrate single-crystal nanomaterials with wafer-based technologies and provides leading-edge capabilities in terms of defining large-area arrays of plasmonic structures with the nanoplate geometry.