Power-Dependent Hybrid Photoluminescence Emission of Ag Nanowires on an Ag Film

IF 6.5 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shuai Dong, Wenxue Zhang, Minru Qi, Aoni Wei, Guofeng Zhang, Ruiyun Chen, Jianyong Hu, Miaoqing Bai, Zhichun Yang, Xinghui Liu, Liantuan Xiao, Chengbing Qin, Suotang Jia
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Abstract

Nobel metal nanostructures, such as silver nanowires (AgNWs), have attracted considerable attention due to their extraordinary capability to manipulate light-matter interactions at the nanoscale and promising applications in various areas. However, the underlying mechanism of photoluminescence (PL) emission of AgNWs on a metal film (NWoF structure) is still under debate. Here, we provided an exhaustive investigation of the PL behaviors of AgNWs by performing substrate-dependent PL imaging, as well as power-dependent PL spectra and photoblinking dynamics of single AgNWs on an Ag film with Al2O3 as a dielectric space. The similar PL spectra among suspension AgNWs, crossed AgNWs on Si/SiO2 substrate, and single AgNWs on the Ag films confirmed that PL emission from NWoF structures is originated from AgNWs, rather than Ag films. Three PL peaks from AgNWs on the Ag film have been attributed to the photoactive Ag nanoclusters, the radiative recombination of intraband transitions, and the possible gap plasmonic modes, respectively, which have been evidenced by analysis of power-dependent PL spectra and photoblinking dynamics. These findings may provide new insight into the PL mechanisms of AgNWs and offer inspiration to develop customized plasmonic applications.

Abstract Image

银纳米线在银薄膜上的功率依赖杂化光致发光发射
诺贝尔金属纳米结构,如银纳米线(AgNWs),由于其在纳米尺度上操纵光-物质相互作用的非凡能力和在各个领域的应用前景而引起了相当大的关注。然而,AgNWs在金属薄膜(NWoF结构)上的光致发光(PL)发射机制仍存在争议。在这里,我们通过执行衬底相关的PL成像,以及以Al2O3为介电空间的Ag薄膜上单个AgNWs的功率相关PL光谱和光闪烁动力学,对AgNWs的PL行为进行了详尽的研究。悬浮AgNWs、Si/SiO2衬底上的交叉AgNWs和Ag薄膜上的单一AgNWs的PL光谱相似,证实了NWoF结构的PL发射来自AgNWs,而不是Ag薄膜。Ag薄膜上AgNWs的三个PL峰分别归因于光活性Ag纳米团簇、带内跃迁的辐射重组和可能的间隙等离子体模式,这已被功率相关PL光谱和光闪烁动力学分析所证实。这些发现可能为AgNWs的PL机制提供新的见解,并为开发定制等离子体应用提供灵感。
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来源期刊
ACS Photonics
ACS Photonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
11.90
自引率
5.70%
发文量
438
审稿时长
2.3 months
期刊介绍: Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.
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