Hydrogen Sensing Application of Palladium-Coated Silver Double Nanowire System

IF 3.3 4区 物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2024-08-21 DOI:10.1007/s11468-024-02424-z
Yinqiao Li, Yu Su, Hongbin Jin, Yunfei Zou, Song Wang, Gang Song
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Abstract

We investigate surface plasmon polaritons (SPPs) modes in palladium (Pd)-coated silver double nanowires by using the finite difference time domain (FDTD) method. Since Pd can absorb hydrogen (H\(_2\)) and converts to Pd-H, its permittivity is completely different from that of Pd-H, so the optical response of the system will be also change. The results of electric field distributions and propagation lengths of seven modes of the designed structure are obtained by calculations. For different modes, it is found that the propagation length increases with the increase of mode order. The propagation lengths of the same mode in the structure of Pd and Pd-H are respectively compared, and it is discovered that it is also different due to the change of dielectric constant before and after H\(_2\) absorption. The results show that in the double nanowire structure, the propagation lengths of structures with Pd are larger than the ones of structures with Pd-H for each mode. The distance of the two nanowires impacts on the coupling between the two nanowires. By changing the radius of Ag nanowire, the propagation lengths of the fundamental mode increase, while the ones of the harmonic modes decrease. There is an optimal thickness to make the propagation length longest for each mode by changing the thickness of Pd, which shows the competition between the dissipation of the structure and the coupling between SPPs in different layers. The structure we designed can be applied to the direction of the hydrogen sensor to realize the monitoring of its state when using hydrogen energy to ensure safety.

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钯包银双纳米线系统的氢传感应用
我们利用有限差分时域(FDTD)方法研究了钯(Pd)镀银双纳米线中的表面等离子体极化子(SPPs)模式。由于 Pd 可以吸收氢(H/(_2\))并转化为 Pd-H,其介电常数与 Pd-H 完全不同,因此系统的光学响应也会发生变化。通过计算得到了所设计结构的七种模式的电场分布和传播长度。对于不同的模式,可以发现传播长度随着模式阶数的增加而增加。分别比较了 Pd 和 Pd-H 结构中相同模式的传播长度,发现由于 H\(_2\) 吸收前后介电常数的变化,传播长度也有所不同。结果表明,在双纳米线结构中,Pd 结构的各模式传播长度均大于 Pd-H 结构的各模式传播长度。两根纳米线的距离会影响两根纳米线之间的耦合。通过改变 Ag 纳米线的半径,基波模式的传播长度增加,而谐波模式的传播长度减少。通过改变钯的厚度,每个模式的传播长度都有一个最佳厚度,这表明了结构的耗散与不同层 SPP 之间耦合之间的竞争。我们设计的结构可应用于氢传感器的方向,以实现在使用氢能时对其状态的监测,从而确保安全。
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来源期刊
Plasmonics
Plasmonics 工程技术-材料科学:综合
CiteScore
5.90
自引率
6.70%
发文量
164
审稿时长
2.1 months
期刊介绍: Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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