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Palladium bridged gold nanocylinder dimer: plasmonic properties and hydrogen sensitivity

机译:钯桥金纳米圆柱二聚体:等离子体性能和氢敏感性

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摘要

Plasmonic nanodimers facilitate electromagnetic hotspots at their gap junction. By loading these gap junctions with nanomaterials, the plasmonic properties of nanodimer can be varied. In this study, we bridged the gap junction of gold (Au) nanocylinder dimer with palladium (Pd), and numerically evaluated the plasmonic properties of the designed nanostructure. We simulated the far-field extinction spectra of Pd bridged Au nanocylinder dimer, and identified the dipole and quadrupole plasmon modes at 839 and 578 nm, respectively. By varying the geometrical parameters of the Pd bridge, we revealed the ability to tune the dipolar plasmon resonance of the bridged dimer. Further, we exploited the hydrogen sensitivity of Pd bridge to harness the bridged-Au dimer as nanoplasmonic hydrogen sensor. Such nano-optical detection platforms have minimal spatial footprint and can be further harnessed for chip-based plasmonic sensing.
机译:等离子体纳米二聚体促进其间隙连接处的电磁热点。通过用纳米材料填充这些间隙连接,可以改变纳米二聚体的等离子体性质。在这项研究中,我们弥合了金(Au)纳米圆柱二聚体与钯(Pd)的缝隙连接,并通过数值方法评估了所设计纳米结构的等离子体性能。我们模拟了钯桥金纳米圆柱二聚体的远场消光光谱,并分别确定了在839和578 nm的偶极和四极等离子体激元模式。通过改变Pd桥的几何参数,我们揭示了调节桥二聚体的偶极等离子体激元共振的能力。此外,我们利用Pd桥的氢敏感性将桥Au二聚体用作纳米等离子体氢传感器。这样的纳米光学检测平台具有最小的空间足迹,并且可以进一步用于基于芯片的等离子体传感。

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