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Systematic investigation on quad-metallic AgAuPdPt and tri-metallic AuPdPt NPs through the solid-state dewetting of quad-layer Ag/Au/Pd/Pt thin films on c-plane sapphire

机译:通过对c面蓝宝石上的四层Ag / Au / Pd / Pt薄膜进行固态去湿对四金属AgAuPdPt和三金属AuPdPt NP进行了系统研究

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摘要

Multi-metallic alloy nanoparticles (MNPs) can offer valuable opportunities to meet the various demands of applications. MNPs consist of various noble metallic elements can combine diverse electronic, optical and catalytic properties in a single NP configuration, thus taking the advantage of each element. In this paper, the fabrication of tri- and quad- metallic alloy NPs with noble elements (Ag, Au, Pd and Pt) and the corresponding localized surface plasmon resonance (LPSR) properties are systematically demonstrated. Tri- and quad-metallic alloy NPs come in various size and configurations by the solid-state dewetting of Ag/Au/Pd/Pt quad-layers on sapphire (0001). Tri-metallic AuPdPt NPs are demonstrated by the systematic control of growth temperature along with the significant Ag atom sublimation. Strongly enhanced and tunable LPSR is exerted in the UV-VIS regions depending upon the size, configuration, spacing and elemental composition of the MNPs. The size dependent LSPR response of MNPs is discussed based on the absorption and scattering along with the excitation of dipolar, quadrupolar, high order and multipolar resonance modes. The MNPs exhibit much stronger and dynamic LSPR bands as compared with the monometallic Pt and Pd NPs with the comparable size and configurations.
机译:多金属合金纳米颗粒(MNP)可以提供宝贵的机会来满足各种应用需求。 MNP由各种贵金属元素组成,可以在单个NP配置中结合多种电子,光学和催化特性,从而充分利用每种元素的优势。本文系统地证明了具有贵金属元素(Ag,Au,Pd和Pt)的三金属和四金属合金NP的制造以及相应的局部表面等离子体激元共振(LPSR)性能。通过在蓝宝石(0001)上对Ag / Au / Pd / Pt四层进行固态去湿,三和四金属合金NP具有各种尺寸和构造。通过对生长温度的系统控制以及显着的Ag原子升华,证明了三金属AuPdPt NP。取决于MNP的大小,构型,间距和元素组成,在UV-VIS区域中将产生强烈增强且可调的LPSR。基于偶极,四极,高阶和多极共振模式的吸收和散射以及激发,讨论了MNP的尺寸依赖性LSPR响应。与具有可比大小和构型的单金属Pt和Pd NP相比,MNP表现出更强的动态LSPR带。

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