Large-area arrays of epitaxially aligned silver nanotriangles seeded by gold nanostructures
Large-area arrays of epitaxially aligned silver nanotriangles seeded by gold nanostructures
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DOI：
10.1039/d3qm01184d
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发表时间：
2024-02-02
影响因子：
7
通讯作者：
Neretina，Svetlana
中科院分区：
文献类型：
--
作者：
Lawson，Zachary R.;Xu，Kaikui;Neretina，Svetlana
事实证明，将成核和生长过程分成不同步骤的能力对于实现对胶体合成的高水平控制非常宝贵。这些所谓的种子介导途径的成功取决于专门设计用于利用否则结晶种子内的内部缺陷结构的合成方案的进展。贵金属纳米片代表了最突出的例子，因为它们的合成需要衬有对称性破坏堆垛层错缺陷的种子，当将其置于适当选择的化学环境中时，促进二维异质沉积。尽管这样的合成现在是常见的，但是由于不能以有组织的图案形成适当设计的种子，因此迄今为止已经证明直接在衬底表面上以阵列构造生长平置的银纳米片是不可能实现的。在本文中，银纳米三角形合成被证明在填充有以周期性阵列排列的金种子的衬底表面上。这一成功的关键是通过异质外延将晶体学信息从衬底传递到金种子再到银纳米三角形。如此形成的纳米三角形表现出可调等离子体共振，其中模拟表明响应由银组分主导。因此，这项工作将银纳米三角形添加到不断扩大的合理设计的纳米结构列表中，这些纳米结构可以通过基于基底的合成来实现。
The ability to separate nucleation and growth processes into distinct steps has proved invaluable in achieving high-level control over colloidal synthesis. The success of these so-called seed-mediated pathways has been contingent upon the advancement of synthetic protocols specifically designed to take advantage of the internal defect structures within an otherwise crystalline seed. Noble metal nanoplates represent the most prominent example as their synthesis requires seeds lined with symmetry breaking stacking fault defects that, when placed in a suitably chosen chemical environment, promote two-dimensional heterogeneous deposition. Even though such syntheses are now commonplace, the growth of flat-lying silver nanoplates in arrayed configurations directly on substrate surfaces has heretofore proved unrealizable due to an inability to form appropriately designed seeds in organized patterns. Herein, a silver nanotriangle synthesis is demonstrated on substrate surfaces populated with gold seeds arranged in periodic arrays. Crucial to this success is the relaying of crystallographic information from the substrate to the gold seed to the silver nanotriangle via heteroepitaxy. The so-formed nanotriangles exhibit a tunable plasmon resonance where simulations indicate that the response is dominated by the silver component. The work, hence, adds silver nanotriangles to an ever-expanding list of rationally designed nanostructures accessible through substrate-based syntheses.