Stabilization of Plasmonic Silver Nanostructures with Ultrathin Oxide Coatings Formed Using Atomic Layer Deposition
Stabilization of Plasmonic Silver Nanostructures with Ultrathin Oxide Coatings Formed Using Atomic Layer Deposition
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DOI：
10.1021/acs.jpcc.1c04599
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发表时间：
2021-07-28
影响因子：
3.7
通讯作者：
Neretina, Svetlana
中科院分区：
文献类型：
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作者：
Preston, Arin S.;Hughes, Robert A.;Neretina, Svetlana
尽管性能指标将银定位为电磁波谱中可见和近红外区域的卓越等离子体材料，但由于其性能在必须工作的环境中不可逆转地退化，因此在应用中仍未得到充分利用。然而，作为一种独特的纳米材料，壳隔离等离子体纳米结构的出现为银的利用创造了新的机会，因为银的脆弱表面可以被封装在化学上坚固的透明壳中，同时保持重要的等离子体特性。为了充分利用这一机会，需要合理设计壳-纳米结构组合，并考虑包含纳米结构稳定性-性能关系的参数空间。在此，我们展示了原子层沉积（ALD）技术的逐层沉积能力，作为设计壳隔离银纳米结构的一种手段，其中受限结构作为内置等离子体传感器，用于光谱评估在空气，水和化学侵蚀环境中的耐久性。在所有情况下，适当设计的氧化物外壳都显示出长期稳定性，但其自身的表面化学和结构完整性成为增强和保持等离子体特性的限制因素。因此，这项工作提出了利用ald沉积层来实现壳隔离等离子体纳米结构，从而利用银的显着特性。
Even though performance metrics position silver as the preeminent plasmonic material in the visible and near-infrared regions of the electromagnetic spectrum, it remains underutilized in applications because its properties irreversibly degrade in the environments it must operate. The emergence of shell-isolated plasmonic nanostructures as a distinct class of nanomaterials has, however, created new opportunities for the utilization of silver because its vulnerable surfaces can be encapsulated in a chemically robust transparent shell while maintaining important plasmonic properties. To fully capitalize on this opportunity requires that shell-nanostructure combinations be rationally designed where consideration is given to a parameter space encompassing nanostructure stability-property relationships. Herein, we demonstrate the layer-by-layer deposition capabilities of the atomic layer deposition (ALD) technique as a means to design shell-isolated silver nanostructures where the confined structure acts as a built-in plasmonic sensor for spectroscopically evaluating durability in air, water, and chemically aggressive environments. For all cases, appropriately designed oxide shells are shown to provide long-term stability, but where their own surface chemistry and structural integrity become limiting factors in bolstering and preserving plasmonic properties. The work, therefore, forwards the use of ALD-deposited layers for the realization of shell-isolated plasmonic nanostructures that exploit the remarkable properties of silver.