Wang Xiaotian, Ma Guanshui, Li Anran, Yu Jian, Yang Zhao, Lin Jie, Li Ang, Han Xiaodong, Guo Lin
School of Chemistry , Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology , Ministry of Education , Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing , P. R. China . Email:
Beijing Key Lab of Microstructure and Property of Advanced Materials , Beijing University of Technology , Beijing 100024 , P. R. China.
Chem Sci. 2018 Mar 21;9(16):4009-4015. doi: 10.1039/c8sc00915e. eCollection 2018 Apr 28.
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 NaBH-cooperative galvanic replacement reaction. The SPR frequency of the Ag-Au SAMCs can be continuously and exquisitely manipulated without resonance damping or broadening 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 M. This strategy is a promising candidate for efficient promotion of the SERS activity for metal-based substrates.
调控表面等离子体共振（SPR）特性是提升等离子体学、纳米光子学、光电子学及电化学领域器件性能的关键问题。在此，我们通过一种简便的硼氢化钠协同电置换反应，利用成分可调的银 - 金替代合金微笼（SAMCs）实现了对表面等离子体共振（SPR）效应的可编程操控。银 - 金SAMCs的SPR频率能够在无共振阻尼或展宽的情况下，通过在原子水平上实现完美均匀性的元素组成分布精确调整，进行连续且精细的调控。值得注意的是，可调谐的SPR频率与出色的化学稳定性协同赋予中空银 - 金SAMCs优异的表面增强拉曼散射（SERS）灵敏度和重现性，这为实现超低浓度（1×10⁻⁹ M）福美双的痕量检测奠定了基础。该策略是高效提升基于金属的基底SERS活性的一个有前景的候选方法。
