Composition-adjustable Ag-Au substitutional alloy microcages enabling tunable plasmon resonance for ultrasensitive SERS.

Composition-adjustable Ag-Au substitutional alloy microcages enabling tunable plasmon resonance for ultrasensitive SERS.
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成分可调的 Ag-Au 替代合金微笼可实现超灵敏 SERS 的可调谐等离子共振

DOI:
10.1039/c8sc00915e
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发表时间:
2018-04-28
期刊:
影响因子:
8.4
通讯作者:
Guo L
Guo L
中科院分区:
化学1区
文献类型:
--
作者:
Wang X;Ma G;Li A;Yu J;Yang Z;Lin J;Li A;Han X;Guo L

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一种简单的NaBH4-合作GRR策略,生成成分可调的Ag-Au替代合金微笼,使其能够实现超灵敏SERS的可调谐等离子体共振。在等离子体、纳米光子学、光电子学和电化学等领域,设计表面等离子体共振(SPR)特性是提高器件性能的关键问题。在这里,我们展示了一种可编程的操纵表面等离子体共振(SPR)效应的方法,使用成分可调的银-金替代合金微笼(SAMC),通过与NaBH4合作的电偶极置换反应。通过在原子水平上精确地调整元素组成分布,可以连续而精密地控制Ag-Au SAMC的SPR频率,而不会产生共振衰减或展宽。值得注意的是,可调的SPR频率和良好的化学稳定性协同赋予了中空的Ag-Au自组装膜良好的SERS灵敏度和重现性,这为实现1×10-12M的超低浓度福美双的痕量检测奠定了基础。该策略是有效提高金属基衬底SERS活性的一种有前途的候选策略。
A facile NaBH4-cooperative GRR strategy generating composition-adjustable Ag–Au substitutional alloy microcages enabling tunable plasmon resonance for ultrasensitive SERS. Engineering the surface plasmon resonance (SPR) properties is a critical issue for improving device performance in the fields of plasmonics, nanophotonics, optoelectronics, and electrochemistry. Here, we demonstrated a programmable manipulation of the surface plasmon resonance (SPR) effect using composition-adjustable Ag–Au substitutional alloy microcages (SAMCs) through a facile NaBH4-cooperative galvanic replacement reaction. The SPR frequency of the Ag–Au SAMCs can be continuously and exquisitely manipulated without resonance damping or broadening via accurate adjustment of the elemental composition distribution at the perfect homogeneity on the atomic-level. Significantly, both the tunable SPR frequency and excellent chemical stability synergistically endow the hollow Ag–Au SAMCs with excellent SERS sensitivity and reproducibility, which lays a foundation for the realization of trace detection of thiram at an ultralow concentration of 1 × 10–12 M. This strategy is a promising candidate for efficient promotion of the SERS activity for metal-based substrates.
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