Synthesis of Silver@Gold (Core@Shell) Nanoparticles Deposited on Porous Silicon for Enhanced Spectral Responsivity

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2023-09-09 DOI:10.1007/s11468-023-02043-0

Yasemin H. Khadim, Uday M. Nayef, Falah A.-H. Mutlak

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Abstract

This study investigates the impact of laser pulse energy (500 mJ/pulse) on silver, gold, and silver@gold NPs and deposited on porous silicon. The objective is to assess their effects on structural, optical, morphological, and electrical properties, aiming to identify optimal conditions. Nanoparticles are produced through the technique of pulsed laser ablation in liquid (PLAL). This involves employing a Q-switched Nd: YAG laser operating at a wavelength of 1064 nm and pulse duration of 10 ns. X-ray diffraction (XRD) analysis validates the crystalline development of (core–shell) NPs, evident from the presence of XRD peaks corresponding to Au and Ag NPs. Morphological analysis reveals excellent adhesion between NPs and the substrate (PS), enhancing structural stability. UV–vis spectra demonstrate a localized surface plasmon resonance (LSPR) band within the 420–540 nm range. This band shifts from two peaks to one with increased gold content. A comparison of the photoluminescence emission spectra of porous silicon and Ag@Au NPS/PS at room temperature. The porous silicon exhibits an extreme PL emission band broadening centered at a visible wavelength of 620 nm (2.033 eV), which reveals the excellent quality of the PS structure. Photodetector measurements highlight maximum responsivity for the Ag@Au/PS photodetector. These Ag@Au NPs show promising attributes for high-performance photodetector applications.

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多孔硅上沉积Silver@Gold (Core@Shell)纳米颗粒增强光谱响应性的合成

本研究探讨了激光脉冲能量（500 mJ/脉冲）对沉积在多孔硅上的银、金和银@金 NPs 的影响。目的是评估它们对结构、光学、形态和电学特性的影响，从而确定最佳条件。纳米粒子是通过液体脉冲激光烧蚀（PLAL）技术产生的。该技术采用 Q 开关 Nd：YAG 激光器，波长为 1064 nm，脉冲持续时间为 10 ns。X 射线衍射 (XRD) 分析验证了（核壳）NPs 的结晶发展，这一点从与金和银 NPs 相对应的 XRD 峰的出现可以看出。形态分析表明，NPs 与基底（PS）之间的粘附性极佳，增强了结构的稳定性。紫外-可见光谱显示，在 420-540 纳米范围内存在局部表面等离子体共振（LSPR）带。随着金含量的增加，该波段从两个峰值变为一个峰值。比较室温下多孔硅和 Ag@Au NPS/PS 的光致发光发射光谱。多孔硅显示出以 620 nm 可见光波长（2.033 eV）为中心的极度聚光发射带增宽，这显示了聚苯乙烯结构的优良品质。光电探测器测量结果表明，Ag@Au/PS 光电探测器具有最大响应率。这些 Ag@Au NPs 具有高性能光电探测器应用的良好特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.