Zhu Xupeng, Shi Huimin, Zhang Shi, Yang Zhengmei, Liao Jun, Quan Jun, Xue Shuwen, Zou Changwei, Zhang Jun, Duan Huigao
School of Physics Science and Technology, Lingnan Normal University, Zhanjiang 524048, China.
Center for Research on Leading Technology of Special Equipment, School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China.
Nanoscale. 2021 Jul 1;13(25):11204-11214. doi: 10.1039/d1nr02002a.
We report a strong one-photon photoluminescence (PL) behavior of a silver nanowire directly coupled gold film. The PL peak position of the silver nanowire-coupled gold film deviates from the intrinsic interband transition of gold materials and is not sensitive to the diameter change of the silver nanowire. We attribute this strong PL behavior to the intraband transition of hot electrons dominated by high-order gap plasmons, which are excited in the ultra-small gap formed by an ultra-thin polyvinyl pyrrolidone (PVP) layer coated on the silver nanowire. The results show that the energy required for the strong PL of the heterogeneous system mainly comes from the gold film, acting as an incident energy absorber enhanced by the high-order gap plasmons, while the silver nanowire acts an efficient incident energy focusing antenna. In situ Raman scattering spectra and time-resolved PL intensity integral curves were used to record the carbonization and disappearance process of PVP. The understanding of the PL behavior of the silver nanowire directly coupled gold film proves the universality of plasmon-modulated PL theory and is also of great significance to improve the generation and utilization efficiency of hot electrons with high-order gap plasmons in the fields of catalysis and incident energy capture.
我们报道了一种银纳米线直接耦合金膜的强单光子光致发光（PL）行为。银纳米线耦合金膜的PL峰位置偏离了金材料的本征带间跃迁，并且对银纳米线的直径变化不敏感。我们将这种强PL行为归因于由高阶能隙等离子体激元主导的热电子带内跃迁，这些高阶能隙等离子体激元在涂覆在银纳米线上的超薄聚乙烯吡咯烷酮（PVP）层形成的超小间隙中被激发。结果表明，异质系统强PL所需的能量主要来自金膜，金膜作为由高阶能隙等离子体激元增强的入射能量吸收体，而银纳米线则作为高效的入射能量聚焦天线。利用原位拉曼散射光谱和时间分辨PL强度积分曲线记录了PVP的碳化和消失过程。对银纳米线直接耦合金膜的PL行为的理解证明了等离子体调制PL理论的普遍性，并且对于提高高阶能隙等离子体激元在催化和入射能量捕获领域中热电子的产生和利用效率也具有重要意义。
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