Firmanti Metya Indah, Ha Ji Won
Department of Chemistry, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, South Korea.
Energy Harvest-Storage Research Center (EHSRC), University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, South Korea.
J Phys Chem Lett. 2023 Sep 14;14(36):8016-8023. doi: 10.1021/acs.jpclett.3c02049. Epub 2023 Aug 31.
Plasmon damping and Fano resonance induced in the growth of palladium (Pd) on gold nanorods (AuNRs) have been poorly understood. Herein, we investigated the optical properties and morphologies of single AuNRs@Pd (core@shell) synthesized using epitaxial Pd growth at different Pd concentrations. The localized surface plasmon resonance (LSPR) spectra of single AuNRs@Pd showed characteristic subradiant and superradiant peaks as well as Fano resonance as a spectral dip, which was highly influenced by the Pd shell thickness. The occurrence of the Fano resonance during the Pd growth was further verified by in situ real-time observation experiments. We then elucidated time-dependent, real-time variations in LSPR peak wavelength, metal-induced surface damping, and Fano resonance mode of single AuNRs@Pd during Pd shell formation in three successive phases: Pd reduction, nucleation, and growth. Therefore, this study provides new insights into metal interface damping, the Fano resonance, and optical tunability by engineering the Fano resonance energy and Pd shell thickness.
金纳米棒（AuNRs）上钯（Pd）生长过程中诱导产生的表面等离子体激元阻尼和法诺共振一直未得到充分理解。在此，我们研究了在不同Pd浓度下通过外延生长Pd合成的单个AuNRs@Pd（核@壳）的光学性质和形貌。单个AuNRs@Pd的局域表面等离子体共振（LSPR）光谱显示出特征性的亚辐射峰和超辐射峰以及作为光谱凹陷的法诺共振，这受到Pd壳层厚度的高度影响。通过原位实时观测实验进一步证实了Pd生长过程中法诺共振的出现。然后，我们阐明了在Pd壳形成的三个连续阶段（Pd还原、成核和生长）中，单个AuNRs@Pd的LSPR峰波长、金属诱导的表面阻尼和法诺共振模式随时间的实时变化。因此，本研究通过调控法诺共振能量和Pd壳层厚度，为金属界面阻尼、法诺共振和光学可调性提供了新的见解。
